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