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[AVX-512][InstCombine] Teach InstCombineCalls how to simplify demanded for scalar cmp intrinsics with masking and rounding. 

These intrinsics don't read the upper elements of their first and second input. These are slightly different the the SSE version which does use the upper bits of its first element as passthru bits since the result goes to an XMM register. For AVX-512 the result goes to a mask register instead.

llvm-svn: 289371
This commit is contained in:
Craig Topper 2016-12-11 07:42:04 +00:00
parent 790d0fa569
commit d96395365a
1 changed files with 3 additions and 1 deletions
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4
llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp
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@ -1738,7 +1738,9 @@ Instruction *InstCombiner::visitCallInst(CallInst &CI) {
case Intrinsic::x86_sse2_ucomigt_sd:
case Intrinsic::x86_sse2_ucomile_sd:
case Intrinsic::x86_sse2_ucomilt_sd:
case Intrinsic::x86_sse2_ucomineq_sd: {
case Intrinsic::x86_sse2_ucomineq_sd:
case Intrinsic::x86_avx512_mask_cmp_ss:
case Intrinsic::x86_avx512_mask_cmp_sd: {
// These intrinsics only demand the 0th element of their input vectors. If
// we can simplify the input based on that, do so now.
bool MadeChange = false;