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CostModel: add another known vector trunc optimization.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167488 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nadav Rotem 2012-11-06 21:17:17 +00:00
parent 9d8c678658
commit a6fb97a49a
2 changed files with 4 additions and 0 deletions
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1
lib/Target/X86/X86ISelLowering.cpp
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@ -17692,6 +17692,7 @@ unsigned X86VectorTargetTransformInfo::getCastInstrCost(unsigned Opcode,
{ ISD::FP_TO_SINT, MVT::v4i8, MVT::v4f32, 1 }, { ISD::FP_TO_SINT, MVT::v4i8, MVT::v4f32, 1 },
{ ISD::ZERO_EXTEND, MVT::v8i32, MVT::v8i1, 6 }, { ISD::ZERO_EXTEND, MVT::v8i32, MVT::v8i1, 6 },
{ ISD::SIGN_EXTEND, MVT::v8i32, MVT::v8i1, 9 }, { ISD::SIGN_EXTEND, MVT::v8i32, MVT::v8i1, 9 },
{ ISD::TRUNCATE, MVT::v8i32, MVT::v8i64, 3 },
}; };
if (ST.hasAVX()) { if (ST.hasAVX()) {

3
test/Analysis/CostModel/X86/cast.ll
View File

@ -53,6 +53,9 @@ define i32 @zext_sext(<8 x i1> %in) {
;CHECK: cost of 1 {{.*}} trunc ;CHECK: cost of 1 {{.*}} trunc
%F = trunc <8 x i32> undef to <8 x i16> %F = trunc <8 x i32> undef to <8 x i16>
;CHECK: cost of 3 {{.*}} trunc
%G = trunc <8 x i64> undef to <8 x i32>
ret i32 undef ret i32 undef
} }