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[MemCpyOpt] Only replace memcpy with bitcast if address spaces match
Patch by James Price llvm-svn: 299866
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@ -1335,6 +1335,11 @@ bool MemCpyOptPass::processByValArgument(CallSite CS, unsigned ArgNo) {
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CS.getInstruction(), &AC, &DT) < ByValAlign)
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return false;
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// The address space of the memcpy source must match the byval argument
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if (MDep->getSource()->getType()->getPointerAddressSpace() !=
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ByValArg->getType()->getPointerAddressSpace())
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return false;
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// Verify that the copied-from memory doesn't change in between the memcpy and
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// the byval call.
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// memcpy(a <- b)
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@ -76,8 +76,21 @@ define void @test4(i8 *%P) {
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; CHECK-NEXT: call void @test4a(
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}
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; Make sure we don't remove the memcpy if the source address space doesn't match the byval argument
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define void @test4_addrspace(i8 addrspace(1)* %P) {
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%A = alloca %1
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%a = bitcast %1* %A to i8*
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call void @llvm.memcpy.p0i8.p1i8.i64(i8* %a, i8 addrspace(1)* %P, i64 8, i32 4, i1 false)
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call void @test4a(i8* align 1 byval %a)
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ret void
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; CHECK-LABEL: @test4_addrspace(
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; CHECK: call void @llvm.memcpy.p0i8.p1i8.i64(
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; CHECK-NEXT: call void @test4a(
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}
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declare void @test4a(i8* align 1 byval)
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declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i32, i1) nounwind
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declare void @llvm.memcpy.p0i8.p1i8.i64(i8* nocapture, i8 addrspace(1)* nocapture, i64, i32, i1) nounwind
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declare void @llvm.memcpy.p1i8.p1i8.i64(i8 addrspace(1)* nocapture, i8 addrspace(1)* nocapture, i64, i32, i1) nounwind
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%struct.S = type { i128, [4 x i8]}
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