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X86: Add an SSE2 lowering for 64 bit compares when pcmpgtq (SSE4.2) isn't available.

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This pattern started popping up in vectorized min/max reductions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179797 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer 2013-04-18 21:37:45 +00:00
parent 8bb3b098b9
commit fcba22decb
2 changed files with 176 additions and 15 deletions
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55
lib/Target/X86/X86ISelLowering.cpp
View File

@ -9350,11 +9350,49 @@ static SDValue LowerVSETCC(SDValue Op, const X86Subtarget *Subtarget,
if (Swap) if (Swap)
std::swap(Op0, Op1); std::swap(Op0, Op1);
// Since SSE has no unsigned integer comparisons, we need to flip the sign
// bits of the inputs before performing those operations.
if (FlipSigns) {
EVT EltVT = VT.getVectorElementType();
SDValue SignBit = DAG.getConstant(APInt::getSignBit(EltVT.getSizeInBits()),
EltVT);
std::vector<SDValue> SignBits(VT.getVectorNumElements(), SignBit);
SDValue SignVec = DAG.getNode(ISD::BUILD_VECTOR, dl, VT, &SignBits[0],
SignBits.size());
Op0 = DAG.getNode(ISD::XOR, dl, VT, Op0, SignVec);
Op1 = DAG.getNode(ISD::XOR, dl, VT, Op1, SignVec);
}
// Check that the operation in question is available (most are plain SSE2, // Check that the operation in question is available (most are plain SSE2,
// but PCMPGTQ and PCMPEQQ have different requirements). // but PCMPGTQ and PCMPEQQ have different requirements).
if (VT == MVT::v2i64) { if (VT == MVT::v2i64) {
if (Opc == X86ISD::PCMPGT && !Subtarget->hasSSE42()) if (Opc == X86ISD::PCMPGT && !Subtarget->hasSSE42()) {
return SDValue(); assert(Subtarget->hasSSE2() && "Don't know how to lower!");
// First cast everything to the right type,
Op0 = DAG.getNode(ISD::BITCAST, dl, MVT::v4i32, Op0);
Op1 = DAG.getNode(ISD::BITCAST, dl, MVT::v4i32, Op1);
// Emulate PCMPGTQ with (hi1 > hi2) | ((hi1 == hi2) & (lo1 > lo2))
SDValue GT = DAG.getNode(X86ISD::PCMPGT, dl, MVT::v4i32, Op0, Op1);
SDValue EQ = DAG.getNode(X86ISD::PCMPEQ, dl, MVT::v4i32, Op0, Op1);
// Create masks for only the low parts/high parts of the 64 bit integers.
const int MaskHi[] = { 1, 1, 3, 3 };
const int MaskLo[] = { 0, 0, 2, 2 };
SDValue EQHi = DAG.getVectorShuffle(MVT::v4i32, dl, EQ, EQ, MaskHi);
SDValue GTLo = DAG.getVectorShuffle(MVT::v4i32, dl, GT, GT, MaskLo);
SDValue GTHi = DAG.getVectorShuffle(MVT::v4i32, dl, GT, GT, MaskHi);
SDValue Result = DAG.getNode(ISD::AND, dl, MVT::v4i32, EQHi, GTLo);
Result = DAG.getNode(ISD::OR, dl, MVT::v4i32, Result, GTHi);
if (Invert)
Result = DAG.getNOT(dl, Result, MVT::v4i32);
return DAG.getNode(ISD::BITCAST, dl, VT, Result);
}
if (Opc == X86ISD::PCMPEQ && !Subtarget->hasSSE41()) { if (Opc == X86ISD::PCMPEQ && !Subtarget->hasSSE41()) {
// If pcmpeqq is missing but pcmpeqd is available synthesize pcmpeqq with // If pcmpeqq is missing but pcmpeqd is available synthesize pcmpeqq with
// pcmpeqd + pshufd + pand. // pcmpeqd + pshufd + pand.
@ -9379,19 +9417,6 @@ static SDValue LowerVSETCC(SDValue Op, const X86Subtarget *Subtarget,
} }
} }
// Since SSE has no unsigned integer comparisons, we need to flip the sign
// bits of the inputs before performing those operations.
if (FlipSigns) {
EVT EltVT = VT.getVectorElementType();
SDValue SignBit = DAG.getConstant(APInt::getSignBit(EltVT.getSizeInBits()),
EltVT);
std::vector<SDValue> SignBits(VT.getVectorNumElements(), SignBit);
SDValue SignVec = DAG.getNode(ISD::BUILD_VECTOR, dl, VT, &SignBits[0],
SignBits.size());
Op0 = DAG.getNode(ISD::XOR, dl, VT, Op0, SignVec);
Op1 = DAG.getNode(ISD::XOR, dl, VT, Op1, SignVec);
}
SDValue Result = DAG.getNode(Opc, dl, VT, Op0, Op1); SDValue Result = DAG.getNode(Opc, dl, VT, Op0, Op1);
// If the logical-not of the result is required, perform that now. // If the logical-not of the result is required, perform that now.

136
test/CodeGen/X86/vec_compare.ll
View File

@ -65,3 +65,139 @@ define <2 x i64> @test6(<2 x i64> %A, <2 x i64> %B) nounwind {
%D = sext <2 x i1> %C to <2 x i64> %D = sext <2 x i1> %C to <2 x i64>
ret <2 x i64> %D ret <2 x i64> %D
} }
define <2 x i64> @test7(<2 x i64> %A, <2 x i64> %B) nounwind {
; CHECK: test7:
; CHECK: pcmpgtd %xmm1
; CHECK: pshufd $-96
; CHECK: pcmpeqd
; CHECK: pshufd $-11
; CHECK: pand
; CHECK: pshufd $-11
; CHECK: por
; CHECK: ret
%C = icmp sgt <2 x i64> %A, %B
%D = sext <2 x i1> %C to <2 x i64>
ret <2 x i64> %D
}
define <2 x i64> @test8(<2 x i64> %A, <2 x i64> %B) nounwind {
; CHECK: test8:
; CHECK: pcmpgtd %xmm0
; CHECK: pshufd $-96
; CHECK: pcmpeqd
; CHECK: pshufd $-11
; CHECK: pand
; CHECK: pshufd $-11
; CHECK: por
; CHECK: ret
%C = icmp slt <2 x i64> %A, %B
%D = sext <2 x i1> %C to <2 x i64>
ret <2 x i64> %D
}
define <2 x i64> @test9(<2 x i64> %A, <2 x i64> %B) nounwind {
; CHECK: test9:
; CHECK: pcmpgtd %xmm0
; CHECK: pshufd $-96
; CHECK: pcmpeqd
; CHECK: pshufd $-11
; CHECK: pand
; CHECK: pshufd $-11
; CHECK: por
; CHECK: pcmpeqd
; CHECK: pxor
; CHECK: ret
%C = icmp sge <2 x i64> %A, %B
%D = sext <2 x i1> %C to <2 x i64>
ret <2 x i64> %D
}
define <2 x i64> @test10(<2 x i64> %A, <2 x i64> %B) nounwind {
; CHECK: test10:
; CHECK: pcmpgtd %xmm1
; CHECK: pshufd $-96
; CHECK: pcmpeqd
; CHECK: pshufd $-11
; CHECK: pand
; CHECK: pshufd $-11
; CHECK: por
; CHECK: pcmpeqd
; CHECK: pxor
; CHECK: ret
%C = icmp sle <2 x i64> %A, %B
%D = sext <2 x i1> %C to <2 x i64>
ret <2 x i64> %D
}
define <2 x i64> @test11(<2 x i64> %A, <2 x i64> %B) nounwind {
; CHECK: test11:
; CHECK: pxor
; CHECK: pxor
; CHECK: pcmpgtd %xmm1
; CHECK: pshufd $-96
; CHECK: pcmpeqd
; CHECK: pshufd $-11
; CHECK: pand
; CHECK: pshufd $-11
; CHECK: por
; CHECK: ret
%C = icmp ugt <2 x i64> %A, %B
%D = sext <2 x i1> %C to <2 x i64>
ret <2 x i64> %D
}
define <2 x i64> @test12(<2 x i64> %A, <2 x i64> %B) nounwind {
; CHECK: test12:
; CHECK: pxor
; CHECK: pxor
; CHECK: pcmpgtd %xmm0
; CHECK: pshufd $-96
; CHECK: pcmpeqd
; CHECK: pshufd $-11
; CHECK: pand
; CHECK: pshufd $-11
; CHECK: por
; CHECK: ret
%C = icmp ult <2 x i64> %A, %B
%D = sext <2 x i1> %C to <2 x i64>
ret <2 x i64> %D
}
define <2 x i64> @test13(<2 x i64> %A, <2 x i64> %B) nounwind {
; CHECK: test13:
; CHECK: pxor
; CHECK: pxor
; CHECK: pcmpgtd %xmm0
; CHECK: pshufd $-96
; CHECK: pcmpeqd
; CHECK: pshufd $-11
; CHECK: pand
; CHECK: pshufd $-11
; CHECK: por
; CHECK: pcmpeqd
; CHECK: pxor
; CHECK: ret
%C = icmp uge <2 x i64> %A, %B
%D = sext <2 x i1> %C to <2 x i64>
ret <2 x i64> %D
}
define <2 x i64> @test14(<2 x i64> %A, <2 x i64> %B) nounwind {
; CHECK: test14:
; CHECK: pxor
; CHECK: pxor
; CHECK: pcmpgtd %xmm1
; CHECK: pshufd $-96
; CHECK: pcmpeqd
; CHECK: pshufd $-11
; CHECK: pand
; CHECK: pshufd $-11
; CHECK: por
; CHECK: pcmpeqd
; CHECK: pxor
; CHECK: ret
%C = icmp ule <2 x i64> %A, %B
%D = sext <2 x i1> %C to <2 x i64>
ret <2 x i64> %D
}