forked from OSchip/llvm-project
87 lines
2.1 KiB
LLVM
87 lines
2.1 KiB
LLVM
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; RUN: opt -S -simplifycfg < %s | FileCheck %s
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declare void @llvm.experimental.guard(i1, ...)
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define i32 @f_0(i1 %c) {
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; CHECK-LABEL: @f_0(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 false) [ "deopt"() ]
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; CHECK-NEXT: unreachable
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entry:
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call void(i1, ...) @llvm.experimental.guard(i1 false) [ "deopt"() ]
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ret i32 10
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}
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define i32 @f_1(i1 %c) {
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; Demonstrate that we (intentionally) do not simplify a guard on undef
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; CHECK-LABEL: @f_1(
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; CHECK: ret i32 10
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; CHECK: ret i32 20
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entry:
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br i1 %c, label %true, label %false
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true:
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call void(i1, ...) @llvm.experimental.guard(i1 undef) [ "deopt"() ]
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ret i32 10
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false:
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ret i32 20
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}
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define i32 @f_2(i1 %c, i32* %buf) {
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; CHECK-LABEL: @f_2(
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entry:
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br i1 %c, label %guard_block, label %merge_block
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guard_block:
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call void(i1, ...) @llvm.experimental.guard(i1 false) [ "deopt"() ]
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%val = load i32, i32* %buf
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br label %merge_block
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merge_block:
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%to.return = phi i32 [ %val, %guard_block ], [ 50, %entry ]
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ret i32 %to.return
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; CHECK: guard_block:
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; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 false) [ "deopt"() ]
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; CHECK-NEXT: unreachable
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; CHECK: merge_block:
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; CHECK-NEXT: ret i32 50
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}
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define i32 @f_3(i1* %c, i32* %buf) {
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; CHECK-LABEL: @f_3(
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entry:
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%c0 = load volatile i1, i1* %c
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br i1 %c0, label %guard_block, label %merge_block
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guard_block:
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call void(i1, ...) @llvm.experimental.guard(i1 false) [ "deopt"() ]
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%val = load i32, i32* %buf
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%c2 = load volatile i1, i1* %c
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br i1 %c2, label %left, label %right
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merge_block:
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%c1 = load volatile i1, i1* %c
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br i1 %c1, label %left, label %right
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left:
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%val.left = phi i32 [ %val, %guard_block ], [ 50, %merge_block ]
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ret i32 %val.left
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right:
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%val.right = phi i32 [ %val, %guard_block ], [ 100, %merge_block ]
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ret i32 %val.right
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; CHECK: guard_block:
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; CHECK-NEXT: call void (i1, ...) @llvm.experimental.guard(i1 false) [ "deopt"() ]
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; CHECK-NEXT: unreachable
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; CHECK: merge_block:
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; CHECK-NEXT: %c1 = load volatile i1, i1* %c
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; CHECK-NEXT: [[VAL:%[^ ]]] = select i1 %c1, i32 50, i32 100
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; CHECK-NEXT: ret i32 [[VAL]]
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}
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