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[X86] Accept hasAVX512() as well as hasFMA() when generating FMA.

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We don't always have FMA, for example when using 'clang -mavx512f'
without an explicit CPU.

Also check for an explicit +avx512f instead of CPUs in a couple
related tests.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@240616 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Ahmed Bougacha 2015-06-25 00:44:46 +00:00
parent cd07f777e6
commit eb78c2fbdf
4 changed files with 8 additions and 5 deletions
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8
lib/Target/X86/X86ISelLowering.cpp
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@ -1111,7 +1111,7 @@ X86TargetLowering::X86TargetLowering(const X86TargetMachine &TM,
setOperationAction(ISD::CTPOP, MVT::v8i32, Custom);
setOperationAction(ISD::CTPOP, MVT::v4i64, Custom);
if (Subtarget->hasFMA() || Subtarget->hasFMA4()) {
if (Subtarget->hasFMA() || Subtarget->hasFMA4() || Subtarget->hasAVX512()) {
setOperationAction(ISD::FMA, MVT::v8f32, Legal);
setOperationAction(ISD::FMA, MVT::v4f64, Legal);
setOperationAction(ISD::FMA, MVT::v4f32, Legal);
@ -18636,7 +18636,7 @@ bool X86TargetLowering::isVectorLoadExtDesirable(SDValue) const { return true; }
bool
X86TargetLowering::isFMAFasterThanFMulAndFAdd(EVT VT) const {
if (!(Subtarget->hasFMA() || Subtarget->hasFMA4()))
if (!(Subtarget->hasFMA() || Subtarget->hasFMA4() || Subtarget->hasAVX512()))
return false;
VT = VT.getScalarType();
@ -19821,6 +19821,7 @@ X86TargetLowering::emitEHSjLjLongJmp(MachineInstr *MI,
// Replace 213-type (isel default) FMA3 instructions with 231-type for
// accumulator loops. Writing back to the accumulator allows the coalescer
// to remove extra copies in the loop.
// FIXME: Do this on AVX512. We don't support 231 variants yet (PR23937).
MachineBasicBlock *
X86TargetLowering::emitFMA3Instr(MachineInstr *MI,
MachineBasicBlock *MBB) const {
@ -24182,7 +24183,8 @@ static SDValue PerformFMACombine(SDNode *N, SelectionDAG &DAG,
EVT ScalarVT = VT.getScalarType();
if ((ScalarVT != MVT::f32 && ScalarVT != MVT::f64) ||
(!Subtarget->hasFMA() && !Subtarget->hasFMA4()))
(!Subtarget->hasFMA() && !Subtarget->hasFMA4() &&
!Subtarget->hasAVX512()))
return SDValue();
SDValue A = N->getOperand(0);

2
test/CodeGen/X86/avx512-fma-intrinsics.ll
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@ -1,4 +1,4 @@
; RUN: llc < %s -mtriple=x86_64-apple-darwin -mcpu=knl --show-mc-encoding | FileCheck %s
; RUN: llc < %s -mtriple=x86_64-apple-darwin -mattr=+avx512f --show-mc-encoding | FileCheck %s
declare <16 x float> @llvm.x86.fma.mask.vfmadd.ps.512(<16 x float>, <16 x float>, <16 x float>, i16, i32)
declare <8 x double> @llvm.x86.fma.mask.vfmadd.pd.512(<8 x double>, <8 x double>, <8 x double>, i8, i32)

2
test/CodeGen/X86/avx512-fma.ll
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@ -1,4 +1,4 @@
; RUN: llc < %s -mtriple=x86_64-apple-darwin -mcpu=knl -fp-contract=fast | FileCheck %s
; RUN: llc < %s -mtriple=x86_64-apple-darwin -mattr=+avx512f -fp-contract=fast | FileCheck %s
; CHECK-LABEL: test_x86_fmadd_ps_z
; CHECK: vfmadd213ps %zmm2, %zmm1, %zmm0

1
test/CodeGen/X86/fma.ll
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@ -2,6 +2,7 @@
; RUN: llc < %s -mtriple=i386-apple-darwin10 -mattr=-fma,-fma4 | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-FMA-CALL
; RUN: llc < %s -mtriple=x86_64-apple-darwin10 -mattr=+fma,-fma4 | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-FMA-INST
; RUN: llc < %s -mtriple=x86_64-apple-darwin10 -mattr=-fma,-fma4 | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-FMA-CALL
; RUN: llc < %s -mtriple=x86_64-apple-darwin10 -mattr=+avx512f,-fma,-fma4 | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-FMA-INST
; RUN: llc < %s -march=x86 -mcpu=bdver2 -mattr=-fma4 | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-FMA-INST
; RUN: llc < %s -march=x86 -mcpu=bdver2 -mattr=-fma,-fma4 | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-FMA-CALL