[llvm-commits] [llvm] r131493 - in /llvm/trunk: lib/Transforms/InstCombine/InstCombineCalls.cpp lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp test/CodeGen/X86/2011-05-17-pmovzxwd.ll

[Stuart Hastings]

On May 17, 2011, at 9:33 PM, Chris Lattner wrote:

> 
> On May 17, 2011, at 3:13 PM, Stuart Hastings wrote:
> 
>> Author: stuart
>> Date: Tue May 17 17:13:31 2011
>> New Revision: 131493
>> 
>> URL: http://llvm.org/viewvc/llvm-project?rev=131493&view=rev
>> Log:
>> X86 pmovsx/pmovzx ignore the upper half of their inputs.
>> rdar://problem/6945110
> 
> Hi Stuart,
> 
>> +  case Intrinsic::x86_sse41_pmovzxdq: {
>> +    unsigned VWidth =
>> +      cast<VectorType>(II->getArgOperand(0)->getType())->getNumElements();
>> +    unsigned LowHalfElts = VWidth / 2;
>> +    APInt InputDemandedElts(VWidth, 0);
>> +    InputDemandedElts = InputDemandedElts.getBitsSet(VWidth, 0, LowHalfElts);
> 
> getBitsSet is a static method.  Please do this instead:
> 
> APInt InputDemandedElts(APInt::getBitsSet(VWidth, 0, LowHalfElts));

Done in 131538.

>> +++ llvm/trunk/test/CodeGen/X86/2011-05-17-pmovzxwd.ll Tue May 17 17:13:31 2011
>> @@ -0,0 +1,15 @@
>> +; RUN: opt -instcombine -S < %s | FileCheck %s
>> +; <rdar://problem/6945110>
>> +
>> +define <4 x i32> @kernel3_vertical(<4 x i16> * %src, <8 x i16> * %foo) nounwind {
>> +entry:
>> +	%tmp = load <4 x i16>* %src
>> +	%tmp1 = load <8 x i16>* %foo
>> +; CHECK: shufflevector
>> +	%tmp2 = shufflevector <4 x i16> %tmp, <4 x i16> undef, <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 undef, i32 undef, i32 undef, i32 undef>
>> +; CHECK-NOT: shufflevector
>> +	%tmp3 = shufflevector <8 x i16> %tmp1, <8 x i16> %tmp2, <8 x i32> <i32 8, i32 9, i32 10, i32 11, i32 4, i32 5, i32 6, i32 7>
>> +	%0 = call <4 x i32> @llvm.x86.sse41.pmovzxwd(<8 x i16> %tmp3)
>> +	ret <4 x i32> %0
>> +}
>> +declare <4 x i32> @llvm.x86.sse41.pmovzxwd(<8 x i16>) nounwind readnone
> 
> Please make the CHECK lines more specific so that it is more clear what you're doing here, add a comment explaining what is going on (to the test)
> and merge the test into an extant .ll file.

Merged into vec_shuffle-36.ll in 131539.

> Thanks,

Thanks for the review,

stuart