209 lines
5.0 KiB
LLVM
209 lines
5.0 KiB
LLVM
; RUN: opt -S -loop-unroll < %s | FileCheck %s
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; RUN: opt -S -passes='require<opt-remark-emit>,loop(unroll-full)' < %s | FileCheck %s
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; Unroll twice, with first loop exit kept
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; CHECK-LABEL: @s32_max1
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; CHECK: do.body:
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; CHECK: store
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; CHECK: br i1 %cmp, label %do.body.1, label %do.end
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; CHECK: do.end:
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; CHECK: ret void
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; CHECK: do.body.1:
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; CHECK: store
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; CHECK: br label %do.end
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define void @s32_max1(i32 %n, i32* %p) {
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entry:
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%add = add i32 %n, 1
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br label %do.body
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do.body:
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%i.0 = phi i32 [ %n, %entry ], [ %inc, %do.body ]
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%arrayidx = getelementptr i32, i32* %p, i32 %i.0
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store i32 %i.0, i32* %arrayidx, align 4
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%inc = add i32 %i.0, 1
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%cmp = icmp slt i32 %i.0, %add
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br i1 %cmp, label %do.body, label %do.end ; taken either 0 or 1 times
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do.end:
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ret void
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}
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; Unroll thrice, with first loop exit kept
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; CHECK-LABEL: @s32_max2
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; CHECK: do.body:
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; CHECK: store
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; CHECK: br i1 %cmp, label %do.body.1, label %do.end
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; CHECK: do.end:
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; CHECK: ret void
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; CHECK: do.body.1:
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; CHECK: store
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; CHECK: store
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; CHECK: br label %do.end
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define void @s32_max2(i32 %n, i32* %p) {
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entry:
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%add = add i32 %n, 2
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br label %do.body
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do.body:
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%i.0 = phi i32 [ %n, %entry ], [ %inc, %do.body ]
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%arrayidx = getelementptr i32, i32* %p, i32 %i.0
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store i32 %i.0, i32* %arrayidx, align 4
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%inc = add i32 %i.0, 1
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%cmp = icmp slt i32 %i.0, %add
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br i1 %cmp, label %do.body, label %do.end ; taken either 0 or 2 times
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do.end:
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ret void
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}
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; Should not be unrolled
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; CHECK-LABEL: @s32_maxx
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; CHECK: do.body:
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; CHECK: do.end:
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; CHECK-NOT: do.body.1:
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define void @s32_maxx(i32 %n, i32 %x, i32* %p) {
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entry:
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%add = add i32 %x, %n
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br label %do.body
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do.body:
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%i.0 = phi i32 [ %n, %entry ], [ %inc, %do.body ]
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%arrayidx = getelementptr i32, i32* %p, i32 %i.0
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store i32 %i.0, i32* %arrayidx, align 4
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%inc = add i32 %i.0, 1
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%cmp = icmp slt i32 %i.0, %add
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br i1 %cmp, label %do.body, label %do.end ; taken either 0 or x times
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do.end:
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ret void
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}
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; Should not be unrolled
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; CHECK-LABEL: @s32_max2_unpredictable_exit
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; CHECK: do.body:
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; CHECK: do.end:
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; CHECK-NOT: do.body.1:
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define void @s32_max2_unpredictable_exit(i32 %n, i32 %x, i32* %p) {
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entry:
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%add = add i32 %n, 2
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br label %do.body
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do.body:
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%i.0 = phi i32 [ %n, %entry ], [ %inc, %if.end ]
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%cmp = icmp eq i32 %i.0, %x
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br i1 %cmp, label %do.end, label %if.end ; unpredictable
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if.end:
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%arrayidx = getelementptr i32, i32* %p, i32 %i.0
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store i32 %i.0, i32* %arrayidx, align 4
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%inc = add i32 %i.0, 1
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%cmp1 = icmp slt i32 %i.0, %add
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br i1 %cmp1, label %do.body, label %do.end ; taken either 0 or 2 times
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do.end:
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ret void
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}
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; Unroll twice, with first loop exit kept
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; CHECK-LABEL: @u32_max1
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; CHECK: do.body:
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; CHECK: store
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; CHECK: br i1 %cmp, label %do.body.1, label %do.end
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; CHECK: do.end:
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; CHECK: ret void
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; CHECK: do.body.1:
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; CHECK: store
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; CHECK: br label %do.end
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define void @u32_max1(i32 %n, i32* %p) {
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entry:
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%add = add i32 %n, 1
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br label %do.body
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do.body:
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%i.0 = phi i32 [ %n, %entry ], [ %inc, %do.body ]
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%arrayidx = getelementptr i32, i32* %p, i32 %i.0
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store i32 %i.0, i32* %arrayidx, align 4
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%inc = add i32 %i.0, 1
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%cmp = icmp ult i32 %i.0, %add
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br i1 %cmp, label %do.body, label %do.end ; taken either 0 or 1 times
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do.end:
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ret void
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}
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; Unroll thrice, with first loop exit kept
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; CHECK-LABEL: @u32_max2
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; CHECK: do.body:
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; CHECK: store
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; CHECK: br i1 %cmp, label %do.body.1, label %do.end
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; CHECK: do.end:
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; CHECK: ret void
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; CHECK: do.body.1:
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; CHECK: store
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; CHECK: store
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; CHECK: br label %do.end
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define void @u32_max2(i32 %n, i32* %p) {
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entry:
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%add = add i32 %n, 2
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br label %do.body
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do.body:
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%i.0 = phi i32 [ %n, %entry ], [ %inc, %do.body ]
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%arrayidx = getelementptr i32, i32* %p, i32 %i.0
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store i32 %i.0, i32* %arrayidx, align 4
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%inc = add i32 %i.0, 1
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%cmp = icmp ult i32 %i.0, %add
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br i1 %cmp, label %do.body, label %do.end ; taken either 0 or 2 times
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do.end:
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ret void
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}
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; Should not be unrolled
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; CHECK-LABEL: @u32_maxx
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; CHECK: do.body:
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; CHECK: do.end:
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; CHECK-NOT: do.body.1:
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define void @u32_maxx(i32 %n, i32 %x, i32* %p) {
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entry:
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%add = add i32 %x, %n
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br label %do.body
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do.body:
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%i.0 = phi i32 [ %n, %entry ], [ %inc, %do.body ]
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%arrayidx = getelementptr i32, i32* %p, i32 %i.0
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store i32 %i.0, i32* %arrayidx, align 4
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%inc = add i32 %i.0, 1
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%cmp = icmp ult i32 %i.0, %add
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br i1 %cmp, label %do.body, label %do.end ; taken either 0 or x times
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do.end:
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ret void
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}
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; Should not be unrolled
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; CHECK-LABEL: @u32_max2_unpredictable_exit
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; CHECK: do.body:
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; CHECK: do.end:
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; CHECK-NOT: do.body.1:
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define void @u32_max2_unpredictable_exit(i32 %n, i32 %x, i32* %p) {
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entry:
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%add = add i32 %n, 2
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br label %do.body
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do.body:
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%i.0 = phi i32 [ %n, %entry ], [ %inc, %if.end ]
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%cmp = icmp eq i32 %i.0, %x
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br i1 %cmp, label %do.end, label %if.end ; unpredictable
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if.end:
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%arrayidx = getelementptr i32, i32* %p, i32 %i.0
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store i32 %i.0, i32* %arrayidx, align 4
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%inc = add i32 %i.0, 1
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%cmp1 = icmp ult i32 %i.0, %add
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br i1 %cmp1, label %do.body, label %do.end ; taken either 0 or 2 times
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do.end:
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ret void
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}
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