161 lines
4.9 KiB
LLVM
161 lines
4.9 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -S -instcombine | FileCheck %s
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@A = extern_weak global i32, align 4
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@B = extern_weak global i32, align 4
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define i32 @foo(i1 %which) {
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; CHECK-LABEL: @foo(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br i1 [[WHICH:%.*]], label [[FINAL:%.*]], label [[DELAY:%.*]]
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; CHECK: delay:
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; CHECK-NEXT: br label [[FINAL]]
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; CHECK: final:
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; CHECK-NEXT: [[USE2:%.*]] = phi i32 [ 1, [[ENTRY:%.*]] ], [ select (i1 icmp eq (i32* @A, i32* @B), i32 2, i32 1), [[DELAY]] ]
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; CHECK-NEXT: ret i32 [[USE2]]
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;
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entry:
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br i1 %which, label %final, label %delay
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delay:
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br label %final
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final:
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%use2 = phi i1 [ false, %entry ], [ icmp eq (i32* @A, i32* @B), %delay ]
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%value = select i1 %use2, i32 2, i32 1
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ret i32 %value
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}
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; test folding of select into phi for vectors.
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define <4 x i64> @vec1(i1 %which) {
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; CHECK-LABEL: @vec1(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br i1 [[WHICH:%.*]], label [[FINAL:%.*]], label [[DELAY:%.*]]
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; CHECK: delay:
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; CHECK-NEXT: br label [[FINAL]]
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; CHECK: final:
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; CHECK-NEXT: [[PHINODE:%.*]] = phi <4 x i64> [ zeroinitializer, [[ENTRY:%.*]] ], [ <i64 0, i64 0, i64 126, i64 127>, [[DELAY]] ]
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; CHECK-NEXT: ret <4 x i64> [[PHINODE]]
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;
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entry:
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br i1 %which, label %final, label %delay
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delay:
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br label %final
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final:
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%phinode = phi <4 x i1> [ <i1 true, i1 true, i1 true, i1 true>, %entry ], [ <i1 true, i1 true, i1 false, i1 false>, %delay ]
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%sel = select <4 x i1> %phinode, <4 x i64> zeroinitializer, <4 x i64> <i64 124, i64 125, i64 126, i64 127>
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ret <4 x i64> %sel
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}
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define <4 x i64> @vec2(i1 %which) {
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; CHECK-LABEL: @vec2(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br i1 [[WHICH:%.*]], label [[FINAL:%.*]], label [[DELAY:%.*]]
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; CHECK: delay:
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; CHECK-NEXT: br label [[FINAL]]
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; CHECK: final:
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; CHECK-NEXT: [[PHINODE:%.*]] = phi <4 x i64> [ <i64 124, i64 125, i64 126, i64 127>, [[ENTRY:%.*]] ], [ <i64 0, i64 125, i64 0, i64 127>, [[DELAY]] ]
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; CHECK-NEXT: ret <4 x i64> [[PHINODE]]
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;
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entry:
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br i1 %which, label %final, label %delay
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delay:
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br label %final
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final:
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%phinode = phi <4 x i1> [ <i1 false, i1 false, i1 false, i1 false>, %entry ], [ <i1 true, i1 false, i1 true, i1 false>, %delay ]
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%sel = select <4 x i1> %phinode, <4 x i64> zeroinitializer, <4 x i64> <i64 124, i64 125, i64 126, i64 127>
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ret <4 x i64> %sel
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}
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; Test PR33364
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; Insert the generated select into the same block as the incoming phi value.
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; phi has constant vectors along with a single non-constant vector as operands.
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define <2 x i8> @vec3(i1 %cond1, i1 %cond2, <2 x i1> %x, <2 x i8> %y, <2 x i8> %z) {
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; CHECK-LABEL: @vec3(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[PHI_SEL1:%.*]] = shufflevector <2 x i8> [[Z:%.*]], <2 x i8> [[Y:%.*]], <2 x i32> <i32 0, i32 3>
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; CHECK-NEXT: br i1 [[COND1:%.*]], label [[IF1:%.*]], label [[ELSE:%.*]]
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; CHECK: if1:
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; CHECK-NEXT: [[PHI_SEL2:%.*]] = shufflevector <2 x i8> [[Y]], <2 x i8> [[Z]], <2 x i32> <i32 0, i32 3>
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; CHECK-NEXT: br i1 [[COND2:%.*]], label [[IF2:%.*]], label [[ELSE]]
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; CHECK: if2:
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; CHECK-NEXT: [[PHI_SEL:%.*]] = select <2 x i1> [[X:%.*]], <2 x i8> [[Y]], <2 x i8> [[Z]]
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; CHECK-NEXT: br label [[ELSE]]
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; CHECK: else:
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; CHECK-NEXT: [[PHI:%.*]] = phi <2 x i8> [ [[PHI_SEL]], [[IF2]] ], [ [[PHI_SEL1]], [[ENTRY:%.*]] ], [ [[PHI_SEL2]], [[IF1]] ]
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; CHECK-NEXT: ret <2 x i8> [[PHI]]
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;
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entry:
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br i1 %cond1, label %if1, label %else
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if1:
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br i1 %cond2, label %if2, label %else
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if2:
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br label %else
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else:
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%phi = phi <2 x i1> [ %x, %if2 ], [ <i1 0, i1 1>, %entry ], [ <i1 1, i1 0>, %if1 ]
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%sel = select <2 x i1> %phi, <2 x i8> %y, <2 x i8> %z
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ret <2 x i8> %sel
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}
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; Don't crash on unreachable IR.
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define void @PR48369(i32 %a, i32* %p) {
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; CHECK-LABEL: @PR48369(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[PHI_CMP:%.*]] = icmp sgt i32 [[A:%.*]], 0
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; CHECK-NEXT: br label [[BB1:%.*]]
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; CHECK: bb1:
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; CHECK-NEXT: [[CMP:%.*]] = phi i1 [ [[PHI_CMP]], [[DEADBB:%.*]] ], [ true, [[ENTRY:%.*]] ]
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; CHECK-NEXT: [[SHL:%.*]] = select i1 [[CMP]], i32 256, i32 0
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; CHECK-NEXT: store i32 [[SHL]], i32* [[P:%.*]], align 4
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; CHECK-NEXT: br label [[END:%.*]]
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; CHECK: deadbb:
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; CHECK-NEXT: br label [[BB1]]
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; CHECK: end:
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; CHECK-NEXT: ret void
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;
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entry:
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%phi.cmp = icmp sgt i32 %a, 0
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br label %bb1
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bb1:
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%cmp = phi i1 [ %phi.cmp, %deadbb ], [ true, %entry ]
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%shl = select i1 %cmp, i32 256, i32 0
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store i32 %shl, i32* %p
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br label %end
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deadbb:
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br label %bb1
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end:
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ret void
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}
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define i16 @sink_to_unreachable_crash(i1 %a) {
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; CHECK-LABEL: @sink_to_unreachable_crash(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[S:%.*]] = select i1 [[A:%.*]], i16 0, i16 5
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; CHECK-NEXT: br label [[INF_LOOP:%.*]]
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; CHECK: inf_loop:
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; CHECK-NEXT: br label [[INF_LOOP]]
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; CHECK: unreachable:
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; CHECK-NEXT: ret i16 [[S]]
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;
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entry:
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%s = select i1 %a, i16 0, i16 5
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br label %inf_loop
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inf_loop:
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br label %inf_loop
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unreachable: ; No predecessors!
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ret i16 %s
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}
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