60 lines
1.8 KiB
LLVM
60 lines
1.8 KiB
LLVM
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; Test to make sure llvm.invariant.start calls are not treated as clobbers.
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; RUN: opt < %s -gvn -S | FileCheck %s
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declare {}* @llvm.invariant.start.p0i8(i64, i8* nocapture) nounwind readonly
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declare void @llvm.invariant.end.p0i8({}*, i64, i8* 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: @forward_store
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; CHECK: call {}* @llvm.invariant.start.p0i8(i64 1, i8* %a)
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; CHECK-NOT: load
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; CHECK: ret i8 0
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%a = alloca i8
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store i8 0, i8* %a
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%i = call {}* @llvm.invariant.start.p0i8(i64 1, i8* %a)
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%r = load i8, i8* %a
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ret i8 %r
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}
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declare i8 @dummy(i8* 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: forward_store_nonlocal
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; CHECK: call {}* @llvm.invariant.start.p0i8(i64 1, i8* %a)
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; CHECK: ret i8 0
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; CHECK: ret i8 %val
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%a = alloca i8
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store i8 0, i8* %a
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%i = call {}* @llvm.invariant.start.p0i8(i64 1, i8* %a)
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br i1 %cond, label %loadblock, label %exit
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loadblock:
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%r = load i8, i8* %a
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ret i8 %r
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exit:
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%val = call i8 @dummy(i8* %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: forward_store1
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; CHECK: %foo = call {}* @llvm.invariant.start.p0i8
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; CHECK-NOT: load
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; CHECK: %bar = call {}* @llvm.invariant.start.p0i8
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; CHECK: call void @llvm.invariant.end.p0i8({}* %bar, i64 1, i8* %a)
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; CHECK: ret i8 0
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%a = alloca i8
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store i8 0, i8* %a
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%foo = call {}* @llvm.invariant.start.p0i8(i64 1, i8* %a)
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%r = load i8, i8* %a
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%bar = call {}* @llvm.invariant.start.p0i8(i64 1, i8* %a)
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call void @llvm.invariant.end.p0i8({}* %bar, i64 1, i8* %a)
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ret i8 %r
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}
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