73 lines
2.5 KiB
LLVM
73 lines
2.5 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 4
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; Test to make sure llvm.invariant.start calls are not treated as clobbers.
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; RUN: opt < %s -passes=newgvn -S | FileCheck %s
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declare ptr @llvm.invariant.start.p0(i64, ptr nocapture) nounwind readonly
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declare void @llvm.invariant.end.p0(ptr, i64, ptr nocapture) nounwind
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; We forward store to the load across the invariant.start intrinsic
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define i8 @forward_store() {
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; CHECK-LABEL: define i8 @forward_store() {
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; CHECK-NEXT: [[A:%.*]] = alloca i8, align 1
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; CHECK-NEXT: store i8 0, ptr [[A]], align 1
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; CHECK-NEXT: [[I:%.*]] = call ptr @llvm.invariant.start.p0(i64 1, ptr [[A]])
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; CHECK-NEXT: ret i8 0
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;
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%a = alloca i8
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store i8 0, ptr %a
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%i = call ptr @llvm.invariant.start.p0(i64 1, ptr %a)
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%r = load i8, ptr %a
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ret i8 %r
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}
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declare i8 @dummy(ptr nocapture) nounwind readonly
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; We forward store to the load in the non-local analysis case,
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; i.e. invariant.start is in another basic block.
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define i8 @forward_store_nonlocal(i1 %cond) {
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; CHECK-LABEL: define i8 @forward_store_nonlocal(
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; CHECK-SAME: i1 [[COND:%.*]]) {
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; CHECK-NEXT: [[A:%.*]] = alloca i8, align 1
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; CHECK-NEXT: store i8 0, ptr [[A]], align 1
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; CHECK-NEXT: [[I:%.*]] = call ptr @llvm.invariant.start.p0(i64 1, ptr [[A]])
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; CHECK-NEXT: br i1 [[COND]], label [[LOADBLOCK:%.*]], label [[EXIT:%.*]]
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; CHECK: loadblock:
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; CHECK-NEXT: ret i8 0
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; CHECK: exit:
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; CHECK-NEXT: [[VAL:%.*]] = call i8 @dummy(ptr [[A]])
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; CHECK-NEXT: ret i8 [[VAL]]
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;
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%a = alloca i8
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store i8 0, ptr %a
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%i = call ptr @llvm.invariant.start.p0(i64 1, ptr %a)
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br i1 %cond, label %loadblock, label %exit
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loadblock:
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%r = load i8, ptr %a
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ret i8 %r
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exit:
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%val = call i8 @dummy(ptr %a)
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ret i8 %val
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}
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; We should not value forward %foo to the invariant.end corresponding to %bar.
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define i8 @forward_store1() {
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; CHECK-LABEL: define i8 @forward_store1() {
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; CHECK-NEXT: [[A:%.*]] = alloca i8, align 1
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; CHECK-NEXT: store i8 0, ptr [[A]], align 1
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; CHECK-NEXT: [[FOO:%.*]] = call ptr @llvm.invariant.start.p0(i64 1, ptr [[A]])
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; CHECK-NEXT: [[BAR:%.*]] = call ptr @llvm.invariant.start.p0(i64 1, ptr [[A]])
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; CHECK-NEXT: call void @llvm.invariant.end.p0(ptr [[BAR]], i64 1, ptr [[A]])
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; CHECK-NEXT: ret i8 0
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;
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%a = alloca i8
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store i8 0, ptr %a
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%foo = call ptr @llvm.invariant.start.p0(i64 1, ptr %a)
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%r = load i8, ptr %a
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%bar = call ptr @llvm.invariant.start.p0(i64 1, ptr %a)
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call void @llvm.invariant.end.p0(ptr %bar, i64 1, ptr %a)
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ret i8 %r
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}
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