c23b4fbdbb
Now that #149310 has restricted lifetime intrinsics to only work on allocas, we can also drop the explicit size argument. Instead, the size is implied by the alloca. This removes the ability to only mark a prefix of an alloca alive/dead. We never used that capability, so we should remove the need to handle that possibility everywhere (though many key places, including stack coloring, did not actually respect this).
45 lines
2.0 KiB
LLVM
45 lines
2.0 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -passes=memcpyopt,instcombine -S %s -verify-memoryssa | FileCheck %s
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%Foo = type { [2048 x i64] }
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; Make sure that all mempcy calls are converted to memset calls, or removed.
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define void @baz() unnamed_addr #0 {
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; CHECK-LABEL: @baz(
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; CHECK-NEXT: entry-block:
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; CHECK-NEXT: [[TMP2:%.*]] = alloca [[FOO:%.*]], align 8
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; CHECK-NEXT: call void @llvm.lifetime.start.p0(ptr nonnull [[TMP2]])
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; CHECK-NEXT: call void @llvm.memset.p0.i64(ptr noundef nonnull align 8 dereferenceable(16384) [[TMP2]], i8 0, i64 16384, i1 false)
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; CHECK-NEXT: call void @bar(ptr noalias nonnull captures(none) dereferenceable(16384) [[TMP2]])
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; CHECK-NEXT: call void @llvm.lifetime.end.p0(ptr nonnull [[TMP2]])
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; CHECK-NEXT: ret void
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;
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entry-block:
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%x.sroa.0 = alloca [2048 x i64], align 8
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%tmp0 = alloca [2048 x i64], align 8
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%tmp2 = alloca %Foo, align 8
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call void @llvm.lifetime.start.p0(ptr %x.sroa.0)
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call void @llvm.lifetime.start.p0(ptr %tmp0)
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call void @llvm.memset.p0.i64(ptr align 8 %tmp0, i8 0, i64 16384, i1 false)
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call void @llvm.memcpy.p0.p0.i64(ptr align 8 %x.sroa.0, ptr align 8 %tmp0, i64 16384, i1 false)
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call void @llvm.lifetime.end.p0(ptr %tmp0)
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call void @llvm.lifetime.start.p0(ptr %tmp2)
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call void @llvm.memcpy.p0.p0.i64(ptr align 8 %tmp2, ptr align 8 %x.sroa.0, i64 16384, i1 false)
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call void @bar(ptr noalias nocapture nonnull dereferenceable(16384) %tmp2)
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call void @llvm.lifetime.end.p0(ptr %tmp2)
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call void @llvm.lifetime.end.p0(ptr %x.sroa.0)
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ret void
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}
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declare void @llvm.lifetime.start.p0(ptr nocapture) #1
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declare void @llvm.memcpy.p0.p0.i64(ptr nocapture writeonly, ptr nocapture readonly, i64, i1) #1
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declare void @llvm.lifetime.end.p0(ptr nocapture) #1
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declare void @bar(ptr noalias nocapture readonly dereferenceable(16384)) unnamed_addr #0
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declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1) #1
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attributes #0 = { uwtable }
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attributes #1 = { argmemonly nounwind }
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