475 lines
15 KiB
LLVM
475 lines
15 KiB
LLVM
; RUN: llc < %s -mtriple=aarch64-linux-gnu | FileCheck %s
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; marked as external to prevent possible optimizations
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@a = external global i32
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@b = external global i32
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@c = external global i32
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@d = external global i32
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; (a > 10 && b == c) || (a >= 10 && b == d)
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define i32 @combine_gt_ge_10() #0 {
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; CHECK-LABEL: combine_gt_ge_10
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; CHECK: cmp
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; CHECK: b.le
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; CHECK: ret
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; CHECK-NOT: cmp
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; CHECK: b.lt
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entry:
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%0 = load i32, i32* @a, align 4
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%cmp = icmp sgt i32 %0, 10
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br i1 %cmp, label %land.lhs.true, label %lor.lhs.false
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land.lhs.true: ; preds = %entry
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%1 = load i32, i32* @b, align 4
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%2 = load i32, i32* @c, align 4
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%cmp1 = icmp eq i32 %1, %2
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br i1 %cmp1, label %return, label %land.lhs.true3
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lor.lhs.false: ; preds = %entry
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%cmp2 = icmp sgt i32 %0, 9
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br i1 %cmp2, label %land.lhs.true3, label %if.end
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land.lhs.true3: ; preds = %lor.lhs.false, %land.lhs.true
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%3 = load i32, i32* @b, align 4
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%4 = load i32, i32* @d, align 4
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%cmp4 = icmp eq i32 %3, %4
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br i1 %cmp4, label %return, label %if.end
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if.end: ; preds = %land.lhs.true3, %lor.lhs.false
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br label %return
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return: ; preds = %if.end, %land.lhs.true3, %land.lhs.true
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%retval.0 = phi i32 [ 0, %if.end ], [ 1, %land.lhs.true3 ], [ 1, %land.lhs.true ]
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ret i32 %retval.0
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}
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; (a > 5 && b == c) || (a < 5 && b == d)
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define i32 @combine_gt_lt_5() #0 {
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; CHECK-LABEL: combine_gt_lt_5
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; CHECK: cmp
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; CHECK: b.le
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; CHECK: ret
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; CHECK-NOT: cmp
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; CHECK: b.ge
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entry:
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%0 = load i32, i32* @a, align 4
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%cmp = icmp sgt i32 %0, 5
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br i1 %cmp, label %land.lhs.true, label %lor.lhs.false
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land.lhs.true: ; preds = %entry
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%1 = load i32, i32* @b, align 4
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%2 = load i32, i32* @c, align 4
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%cmp1 = icmp eq i32 %1, %2
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br i1 %cmp1, label %return, label %if.end
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lor.lhs.false: ; preds = %entry
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%cmp2 = icmp slt i32 %0, 5
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br i1 %cmp2, label %land.lhs.true3, label %if.end
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land.lhs.true3: ; preds = %lor.lhs.false
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%3 = load i32, i32* @b, align 4
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%4 = load i32, i32* @d, align 4
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%cmp4 = icmp eq i32 %3, %4
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br i1 %cmp4, label %return, label %if.end
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if.end: ; preds = %land.lhs.true3, %lor.lhs.false, %land.lhs.true
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br label %return
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return: ; preds = %if.end, %land.lhs.true3, %land.lhs.true
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%retval.0 = phi i32 [ 0, %if.end ], [ 1, %land.lhs.true3 ], [ 1, %land.lhs.true ]
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ret i32 %retval.0
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}
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; (a < 5 && b == c) || (a <= 5 && b == d)
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define i32 @combine_lt_ge_5() #0 {
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; CHECK-LABEL: combine_lt_ge_5
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; CHECK: cmp
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; CHECK: b.ge
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; CHECK: ret
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; CHECK-NOT: cmp
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; CHECK: b.gt
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entry:
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%0 = load i32, i32* @a, align 4
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%cmp = icmp slt i32 %0, 5
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br i1 %cmp, label %land.lhs.true, label %lor.lhs.false
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land.lhs.true: ; preds = %entry
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%1 = load i32, i32* @b, align 4
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%2 = load i32, i32* @c, align 4
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%cmp1 = icmp eq i32 %1, %2
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br i1 %cmp1, label %return, label %land.lhs.true3
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lor.lhs.false: ; preds = %entry
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%cmp2 = icmp slt i32 %0, 6
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br i1 %cmp2, label %land.lhs.true3, label %if.end
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land.lhs.true3: ; preds = %lor.lhs.false, %land.lhs.true
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%3 = load i32, i32* @b, align 4
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%4 = load i32, i32* @d, align 4
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%cmp4 = icmp eq i32 %3, %4
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br i1 %cmp4, label %return, label %if.end
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if.end: ; preds = %land.lhs.true3, %lor.lhs.false
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br label %return
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return: ; preds = %if.end, %land.lhs.true3, %land.lhs.true
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%retval.0 = phi i32 [ 0, %if.end ], [ 1, %land.lhs.true3 ], [ 1, %land.lhs.true ]
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ret i32 %retval.0
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}
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; (a < 5 && b == c) || (a > 5 && b == d)
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define i32 @combine_lt_gt_5() #0 {
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; CHECK-LABEL: combine_lt_gt_5
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; CHECK: cmp
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; CHECK: b.ge
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; CHECK: ret
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; CHECK-NOT: cmp
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; CHECK: b.le
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entry:
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%0 = load i32, i32* @a, align 4
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%cmp = icmp slt i32 %0, 5
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br i1 %cmp, label %land.lhs.true, label %lor.lhs.false
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land.lhs.true: ; preds = %entry
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%1 = load i32, i32* @b, align 4
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%2 = load i32, i32* @c, align 4
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%cmp1 = icmp eq i32 %1, %2
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br i1 %cmp1, label %return, label %if.end
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lor.lhs.false: ; preds = %entry
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%cmp2 = icmp sgt i32 %0, 5
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br i1 %cmp2, label %land.lhs.true3, label %if.end
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land.lhs.true3: ; preds = %lor.lhs.false
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%3 = load i32, i32* @b, align 4
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%4 = load i32, i32* @d, align 4
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%cmp4 = icmp eq i32 %3, %4
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br i1 %cmp4, label %return, label %if.end
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if.end: ; preds = %land.lhs.true3, %lor.lhs.false, %land.lhs.true
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br label %return
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return: ; preds = %if.end, %land.lhs.true3, %land.lhs.true
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%retval.0 = phi i32 [ 0, %if.end ], [ 1, %land.lhs.true3 ], [ 1, %land.lhs.true ]
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ret i32 %retval.0
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}
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; (a > -5 && b == c) || (a < -5 && b == d)
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define i32 @combine_gt_lt_n5() #0 {
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; CHECK-LABEL: combine_gt_lt_n5
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; CHECK: cmn
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; CHECK: b.le
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; CHECK: ret
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; CHECK-NOT: cmn
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; CHECK: b.ge
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entry:
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%0 = load i32, i32* @a, align 4
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%cmp = icmp sgt i32 %0, -5
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br i1 %cmp, label %land.lhs.true, label %lor.lhs.false
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land.lhs.true: ; preds = %entry
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%1 = load i32, i32* @b, align 4
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%2 = load i32, i32* @c, align 4
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%cmp1 = icmp eq i32 %1, %2
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br i1 %cmp1, label %return, label %if.end
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lor.lhs.false: ; preds = %entry
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%cmp2 = icmp slt i32 %0, -5
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br i1 %cmp2, label %land.lhs.true3, label %if.end
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land.lhs.true3: ; preds = %lor.lhs.false
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%3 = load i32, i32* @b, align 4
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%4 = load i32, i32* @d, align 4
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%cmp4 = icmp eq i32 %3, %4
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br i1 %cmp4, label %return, label %if.end
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if.end: ; preds = %land.lhs.true3, %lor.lhs.false, %land.lhs.true
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br label %return
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return: ; preds = %if.end, %land.lhs.true3, %land.lhs.true
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%retval.0 = phi i32 [ 0, %if.end ], [ 1, %land.lhs.true3 ], [ 1, %land.lhs.true ]
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ret i32 %retval.0
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}
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; (a < -5 && b == c) || (a > -5 && b == d)
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define i32 @combine_lt_gt_n5() #0 {
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; CHECK-LABEL: combine_lt_gt_n5
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; CHECK: cmn
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; CHECK: b.ge
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; CHECK: ret
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; CHECK-NOT: cmn
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; CHECK: b.le
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entry:
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%0 = load i32, i32* @a, align 4
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%cmp = icmp slt i32 %0, -5
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br i1 %cmp, label %land.lhs.true, label %lor.lhs.false
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land.lhs.true: ; preds = %entry
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%1 = load i32, i32* @b, align 4
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%2 = load i32, i32* @c, align 4
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%cmp1 = icmp eq i32 %1, %2
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br i1 %cmp1, label %return, label %if.end
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lor.lhs.false: ; preds = %entry
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%cmp2 = icmp sgt i32 %0, -5
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br i1 %cmp2, label %land.lhs.true3, label %if.end
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land.lhs.true3: ; preds = %lor.lhs.false
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%3 = load i32, i32* @b, align 4
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%4 = load i32, i32* @d, align 4
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%cmp4 = icmp eq i32 %3, %4
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br i1 %cmp4, label %return, label %if.end
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if.end: ; preds = %land.lhs.true3, %lor.lhs.false, %land.lhs.true
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br label %return
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return: ; preds = %if.end, %land.lhs.true3, %land.lhs.true
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%retval.0 = phi i32 [ 0, %if.end ], [ 1, %land.lhs.true3 ], [ 1, %land.lhs.true ]
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ret i32 %retval.0
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}
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%struct.Struct = type { i64, i64 }
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@glob = internal unnamed_addr global %struct.Struct* null, align 8
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declare %struct.Struct* @Update(%struct.Struct*) #1
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; no checks for this case, it just should be processed without errors
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define void @combine_non_adjacent_cmp_br(%struct.Struct* nocapture readonly %hdCall) #0 {
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entry:
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%size = getelementptr inbounds %struct.Struct, %struct.Struct* %hdCall, i64 0, i32 0
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%0 = load i64, i64* %size, align 8
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br label %land.rhs
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land.rhs:
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%rp.06 = phi i64 [ %0, %entry ], [ %sub, %while.body ]
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%1 = load i64, i64* inttoptr (i64 24 to i64*), align 8
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%cmp2 = icmp sgt i64 %1, 0
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br i1 %cmp2, label %while.body, label %while.end
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while.body:
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%2 = load %struct.Struct*, %struct.Struct** @glob, align 8
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%call = tail call %struct.Struct* @Update(%struct.Struct* %2) #2
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%sub = add nsw i64 %rp.06, -2
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%cmp = icmp slt i64 %0, %rp.06
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br i1 %cmp, label %land.rhs, label %while.end
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while.end:
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ret void
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}
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; undefined external to prevent possible optimizations
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declare void @do_something() #1
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define i32 @do_nothing_if_resultant_opcodes_would_differ() #0 {
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; CHECK-LABEL: do_nothing_if_resultant_opcodes_would_differ
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; CHECK: cmn
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; CHECK: b.gt
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; CHECK: cmp
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; CHECK: b.gt
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entry:
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%0 = load i32, i32* @a, align 4
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%cmp4 = icmp slt i32 %0, -1
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br i1 %cmp4, label %while.body.preheader, label %while.end
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while.body.preheader: ; preds = %entry
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br label %while.body
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while.body: ; preds = %while.body, %while.body.preheader
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%i.05 = phi i32 [ %inc, %while.body ], [ %0, %while.body.preheader ]
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tail call void @do_something() #2
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%inc = add nsw i32 %i.05, 1
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%cmp = icmp slt i32 %i.05, 0
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br i1 %cmp, label %while.body, label %while.cond.while.end_crit_edge
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while.cond.while.end_crit_edge: ; preds = %while.body
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%.pre = load i32, i32* @a, align 4
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br label %while.end
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while.end: ; preds = %while.cond.while.end_crit_edge, %entry
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%1 = phi i32 [ %.pre, %while.cond.while.end_crit_edge ], [ %0, %entry ]
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%cmp1 = icmp slt i32 %1, 2
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br i1 %cmp1, label %land.lhs.true, label %if.end
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land.lhs.true: ; preds = %while.end
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%2 = load i32, i32* @b, align 4
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%3 = load i32, i32* @d, align 4
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%cmp2 = icmp eq i32 %2, %3
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br i1 %cmp2, label %return, label %if.end
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if.end: ; preds = %land.lhs.true, %while.end
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br label %return
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return: ; preds = %if.end, %land.lhs.true
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%retval.0 = phi i32 [ 0, %if.end ], [ 123, %land.lhs.true ]
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ret i32 %retval.0
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}
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define i32 @do_nothing_if_compares_can_not_be_adjusted_to_each_other() #0 {
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; CHECK-LABEL: do_nothing_if_compares_can_not_be_adjusted_to_each_other
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; CHECK: cmp
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; CHECK: b.gt
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; CHECK: cmn
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; CHECK: b.lt
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entry:
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%0 = load i32, i32* @a, align 4
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%cmp4 = icmp slt i32 %0, 1
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br i1 %cmp4, label %while.body.preheader, label %while.end
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while.body.preheader: ; preds = %entry
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br label %while.body
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while.body: ; preds = %while.body, %while.body.preheader
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%i.05 = phi i32 [ %inc, %while.body ], [ %0, %while.body.preheader ]
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tail call void @do_something() #2
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%inc = add nsw i32 %i.05, 1
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%cmp = icmp slt i32 %i.05, 0
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br i1 %cmp, label %while.body, label %while.end.loopexit
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while.end.loopexit: ; preds = %while.body
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br label %while.end
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while.end: ; preds = %while.end.loopexit, %entry
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%1 = load i32, i32* @c, align 4
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%cmp1 = icmp sgt i32 %1, -3
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br i1 %cmp1, label %land.lhs.true, label %if.end
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land.lhs.true: ; preds = %while.end
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%2 = load i32, i32* @b, align 4
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%3 = load i32, i32* @d, align 4
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%cmp2 = icmp eq i32 %2, %3
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br i1 %cmp2, label %return, label %if.end
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if.end: ; preds = %land.lhs.true, %while.end
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br label %return
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return: ; preds = %if.end, %land.lhs.true
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%retval.0 = phi i32 [ 0, %if.end ], [ 123, %land.lhs.true ]
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ret i32 %retval.0
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}
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; Test in the following case, we don't hit 'cmp' and trigger a false positive
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; cmp w19, #0
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; cinc w0, w19, gt
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; ...
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; fcmp d8, #0.0
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; b.gt .LBB0_5
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define i32 @fcmpri(i32 %argc, i8** nocapture readonly %argv) {
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; CHECK-LABEL: fcmpri:
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; CHECK: cmp w0, #2
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; CHECK: b.lt .LBB9_3
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; CHECK-NOT: cmp w0, #1
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; CHECK-NOT: b.le .LBB9_3
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; CHECK-LABEL-DAG: .LBB9_3
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; CHECK: cmp w19, #0
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; CHECK: fcmp d8, #0.0
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; CHECK-NOT: cmp w19, #1
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; CHECK-NOT: b.ge .LBB9_5
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entry:
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%cmp = icmp sgt i32 %argc, 1
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br i1 %cmp, label %land.lhs.true, label %if.end
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land.lhs.true: ; preds = %entry
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%arrayidx = getelementptr inbounds i8*, i8** %argv, i64 1
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%0 = load i8*, i8** %arrayidx, align 8
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%cmp1 = icmp eq i8* %0, null
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br i1 %cmp1, label %if.end, label %return
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if.end: ; preds = %land.lhs.true, %entry
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%call = call i32 @zoo(i32 1)
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%call2 = call double @yoo(i32 -1)
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%cmp4 = icmp sgt i32 %call, 0
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%add = zext i1 %cmp4 to i32
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%cond = add nsw i32 %add, %call
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%call7 = call i32 @xoo(i32 %cond, i32 2)
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%cmp9 = fcmp ogt double %call2, 0.000000e+00
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br i1 %cmp9, label %cond.end14, label %cond.false12
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cond.false12: ; preds = %if.end
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%sub = fadd fast double %call2, -1.000000e+00
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br label %cond.end14
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cond.end14: ; preds = %if.end, %cond.false12
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%cond15 = phi double [ %sub, %cond.false12 ], [ %call2, %if.end ]
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%call16 = call i32 @woo(double %cond15, double -2.000000e+00)
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br label %return
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return: ; preds = %land.lhs.true, %cond.end14
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%retval.0 = phi i32 [ 4, %cond.end14 ], [ 3, %land.lhs.true ]
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ret i32 %retval.0
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}
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define void @cmp_shifted(i32 %in, i32 %lhs, i32 %rhs) {
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; CHECK-LABEL: cmp_shifted:
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; CHECK: cmp w0, #2, lsl #12
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; [...]
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; CHECK: cmp w0, #1
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%tst_low = icmp sgt i32 %in, 8191
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br i1 %tst_low, label %true, label %false
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true:
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call i32 @zoo(i32 128)
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ret void
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false:
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%tst = icmp sgt i32 %in, 0
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br i1 %tst, label %truer, label %falser
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truer:
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call i32 @zoo(i32 42)
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ret void
|
|
|
|
falser:
|
|
call i32 @zoo(i32 1)
|
|
ret void
|
|
}
|
|
|
|
define i32 @combine_gt_ge_sel(i64 %v, i64* %p) #0 {
|
|
; CHECK-LABEL: combine_gt_ge_sel
|
|
; CHECK: ldr [[reg1:w[0-9]*]],
|
|
; CHECK: cmp [[reg1]], #0
|
|
; CHECK: csel {{.*}}, gt
|
|
entry:
|
|
%0 = load i32, i32* @a, align 4
|
|
%cmp = icmp sgt i32 %0, 0
|
|
%m = select i1 %cmp, i64 %v, i64 0
|
|
store i64 %m, i64* %p
|
|
br i1 %cmp, label %lor.lhs.false, label %land.lhs.true
|
|
|
|
land.lhs.true: ; preds = %entry
|
|
%1 = load i32, i32* @b, align 4
|
|
%2 = load i32, i32* @c, align 4
|
|
%cmp1 = icmp eq i32 %1, %2
|
|
br i1 %cmp1, label %return, label %land.lhs.true3
|
|
|
|
lor.lhs.false: ; preds = %entry
|
|
%cmp2 = icmp sgt i32 %0, 1
|
|
br i1 %cmp2, label %land.lhs.true3, label %if.end
|
|
|
|
land.lhs.true3: ; preds = %lor.lhs.false, %land.lhs.true
|
|
%3 = load i32, i32* @b, align 4
|
|
%4 = load i32, i32* @d, align 4
|
|
%cmp4 = icmp eq i32 %3, %4
|
|
br i1 %cmp4, label %return, label %if.end
|
|
|
|
if.end: ; preds = %land.lhs.true3, %lor.lhs.false
|
|
br label %return
|
|
|
|
return: ; preds = %if.end, %land.lhs.true3, %land.lhs.true
|
|
%retval.0 = phi i32 [ 0, %if.end ], [ 1, %land.lhs.true3 ], [ 1, %land.lhs.true ]
|
|
ret i32 %retval.0
|
|
}
|
|
|
|
declare i32 @zoo(i32)
|
|
|
|
declare double @yoo(i32)
|
|
|
|
declare i32 @xoo(i32, i32)
|
|
|
|
declare i32 @woo(double, double)
|