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[X86] Add AVX512 support to X86FastISel::X86SelectFPExt and X86FastISel::X86SelectFPTrunc.

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llvm-svn: 316856
This commit is contained in:
Craig Topper 2017-10-29 02:50:31 +00:00
parent 623fbac7c6
commit b7aca7ce59
2 changed files with 13 additions and 4 deletions
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16
lib/Target/X86/X86FastISel.cpp
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@ -2473,9 +2473,13 @@ bool X86FastISel::X86SelectFPExtOrFPTrunc(const Instruction *I,
bool X86FastISel::X86SelectFPExt(const Instruction *I) {
if (X86ScalarSSEf64 && I->getType()->isDoubleTy() &&
I->getOperand(0)->getType()->isFloatTy()) {
bool HasAVX512 = Subtarget->hasAVX512();
// fpext from float to double.
unsigned Opc = Subtarget->hasAVX() ? X86::VCVTSS2SDrr : X86::CVTSS2SDrr;
return X86SelectFPExtOrFPTrunc(I, Opc, &X86::FR64RegClass);
unsigned Opc =
HasAVX512 ? X86::VCVTSS2SDZrr
: Subtarget->hasAVX() ? X86::VCVTSS2SDrr : X86::CVTSS2SDrr;
return X86SelectFPExtOrFPTrunc(
I, Opc, HasAVX512 ? &X86::FR64XRegClass : &X86::FR64RegClass);
}
return false;
@ -2484,9 +2488,13 @@ bool X86FastISel::X86SelectFPExt(const Instruction *I) {
bool X86FastISel::X86SelectFPTrunc(const Instruction *I) {
if (X86ScalarSSEf64 && I->getType()->isFloatTy() &&
I->getOperand(0)->getType()->isDoubleTy()) {
bool HasAVX512 = Subtarget->hasAVX512();
// fptrunc from double to float.
unsigned Opc = Subtarget->hasAVX() ? X86::VCVTSD2SSrr : X86::CVTSD2SSrr;
return X86SelectFPExtOrFPTrunc(I, Opc, &X86::FR32RegClass);
unsigned Opc =
HasAVX512 ? X86::VCVTSD2SSZrr
: Subtarget->hasAVX() ? X86::VCVTSD2SSrr : X86::CVTSD2SSrr;
return X86SelectFPExtOrFPTrunc(
I, Opc, HasAVX512 ? &X86::FR32XRegClass : &X86::FR32RegClass);
}
return false;

1
test/CodeGen/X86/fast-isel-fptrunc-fpext.ll
View File

@ -1,6 +1,7 @@
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc < %s -mtriple=x86_64-unknown-unknown -mattr=+sse2 -fast-isel -fast-isel-abort=1 | FileCheck %s --check-prefix=ALL --check-prefix=SSE
; RUN: llc < %s -mtriple=x86_64-unknown-unknown -mattr=+avx -fast-isel -fast-isel-abort=1 | FileCheck %s --check-prefix=ALL --check-prefix=AVX
; RUN: llc < %s -mtriple=x86_64-unknown-unknown -mattr=+avx512f -fast-isel -fast-isel-abort=1 | FileCheck %s --check-prefix=ALL --check-prefix=AVX
;
; Verify that fast-isel doesn't select legacy SSE instructions on targets that
; feature AVX.