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Optimize sext <4 x i8> and <4 x i16> to <4 x i64>.

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Patch by Ahmad, Muhammad T <muhammad.t.ahmad@intel.com>



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@177421 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nadav Rotem 2013-03-19 18:38:27 +00:00
parent a45a22758d
commit b05130e1b2
4 changed files with 42 additions and 6 deletions
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19
lib/Target/X86/X86ISelLowering.cpp
View File

@ -11827,8 +11827,23 @@ SDValue X86TargetLowering::LowerSIGN_EXTEND_INREG(SDValue Op,
// fall through
case MVT::v4i32:
case MVT::v8i16: {
SDValue Tmp1 = getTargetVShiftNode(X86ISD::VSHLI, dl, VT,
Op.getOperand(0), ShAmt, DAG);
// (sext (vzext x)) -> (vsext x)
SDValue Op0 = Op.getOperand(0);
SDValue Op00 = Op0.getOperand(0);
SDValue Tmp1;
// Hopefully, this VECTOR_SHUFFLE is just a VZEXT.
if (Op0.getOpcode() == ISD::BITCAST &&
Op00.getOpcode() == ISD::VECTOR_SHUFFLE)
Tmp1 = LowerVectorIntExtend(Op00, DAG);
if (Tmp1.getNode()) {
SDValue Tmp1Op0 = Tmp1.getOperand(0);
assert(Tmp1Op0.getOpcode() == X86ISD::VZEXT &&
"This optimization is invalid without a VZEXT.");
return DAG.getNode(X86ISD::VSEXT, dl, VT, Tmp1Op0.getOperand(0));
}
// If the above didn't work, then just use Shift-Left + Shift-Right.
Tmp1 = getTargetVShiftNode(X86ISD::VSHLI, dl, VT, Op0, ShAmt, DAG);
return getTargetVShiftNode(X86ISD::VSRAI, dl, VT, Tmp1, ShAmt, DAG);
}
}

4
lib/Target/X86/X86TargetTransformInfo.cpp
View File

@ -257,8 +257,8 @@ unsigned X86TTI::getCastInstrCost(unsigned Opcode, Type *Dst, Type *Src) const {
{ ISD::ZERO_EXTEND, MVT::v8i32, MVT::v8i1, 6 },
{ ISD::SIGN_EXTEND, MVT::v8i32, MVT::v8i1, 9 },
{ ISD::SIGN_EXTEND, MVT::v4i64, MVT::v4i1, 8 },
{ ISD::SIGN_EXTEND, MVT::v4i64, MVT::v4i8, 8 },
{ ISD::SIGN_EXTEND, MVT::v4i64, MVT::v4i16, 8 },
{ ISD::SIGN_EXTEND, MVT::v4i64, MVT::v4i8, 6 },
{ ISD::SIGN_EXTEND, MVT::v4i64, MVT::v4i16, 6 },
{ ISD::TRUNCATE, MVT::v8i32, MVT::v8i64, 3 },
};

4
test/Analysis/CostModel/X86/cast.ll
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@ -44,9 +44,9 @@ define i32 @zext_sext(<8 x i1> %in) {
%B = zext <8 x i16> undef to <8 x i32>
;CHECK: cost of 1 {{.*}} sext
%C = sext <4 x i32> undef to <4 x i64>
;CHECK: cost of 8 {{.*}} sext
;CHECK: cost of 6 {{.*}} sext
%C1 = sext <4 x i8> undef to <4 x i64>
;CHECK: cost of 8 {{.*}} sext
;CHECK: cost of 6 {{.*}} sext
%C2 = sext <4 x i16> undef to <4 x i64>
;CHECK: cost of 1 {{.*}} zext

21
test/CodeGen/X86/avx-sext.ll
View File

@ -165,3 +165,24 @@ define <4 x i64> @sext_4i8_to_4i64(<4 x i8> %mask) {
ret <4 x i64> %extmask
}
; AVX: sext_4i8_to_4i64
; AVX: vpmovsxbd
; AVX: vpmovsxdq
; AVX: vpmovsxdq
; AVX: ret
define <4 x i64> @load_sext_4i8_to_4i64(<4 x i8> *%ptr) {
%X = load <4 x i8>* %ptr
%Y = sext <4 x i8> %X to <4 x i64>
ret <4 x i64>%Y
}
; AVX: sext_4i16_to_4i64
; AVX: vpmovsxwd
; AVX: vpmovsxdq
; AVX: vpmovsxdq
; AVX: ret
define <4 x i64> @load_sext_4i16_to_4i64(<4 x i16> *%ptr) {
%X = load <4 x i16>* %ptr
%Y = sext <4 x i16> %X to <4 x i64>
ret <4 x i64>%Y
}