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[x86][inline-asm][AVX512][llvm][PART-2]

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Introducing "k" and "Yk" constraints for extended inline assembly, enabling use of AVX512 masked vectorized instructions.

Commit on behalf of mharoush

Extending inline assembly support, compatible with GCC as folowing:
"k" constraint hints the compiler to select any of AVX512 k0-k7 registers.
"Yk" constraint is a subset of "k" excluding k0 which is not allowd to be used as a mask.

Reviewer: 1. rnk

Differential Revision: https://reviews.llvm.org/D25062

llvm-svn: 285591
This commit is contained in:
Michael Zuckerman 2016-10-31 16:19:58 +00:00
parent 0eaeb67ad9
commit 9770a3262e
1 changed files with 68 additions and 1 deletions
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69
lib/Target/X86/X86ISelLowering.cpp
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@ -32319,6 +32319,7 @@ X86TargetLowering::getConstraintType(StringRef Constraint) const {
case 'Y':
case 'l':
return C_RegisterClass;
case 'k': // AVX512 masking registers.
case 'a':
case 'b':
case 'c':
@ -32342,6 +32343,19 @@ X86TargetLowering::getConstraintType(StringRef Constraint) const {
break;
}
}
else if (Constraint.size() == 2) {
switch (Constraint[0]) {
default:
break;
case 'Y':
switch (Constraint[1]) {
default:
break;
case 'k':
return C_Register;
}
}
}
return TargetLowering::getConstraintType(Constraint);
}
@ -32385,16 +32399,28 @@ TargetLowering::ConstraintWeight
if (type->isX86_MMXTy() && Subtarget.hasMMX())
weight = CW_SpecificReg;
break;
case 'Y':
// Other "Y<x>" (e.g. "Yk") constraints should be implemented below.
if (constraint[1] == 'k') {
// Support for 'Yk' (similarly to the 'k' variant below).
weight = CW_SpecificReg;
break;
}
// Else fall through (handle "Y" constraint).
LLVM_FALLTHROUGH;
case 'v':
if ((type->getPrimitiveSizeInBits() == 512) && Subtarget.hasAVX512())
weight = CW_Register;
LLVM_FALLTHROUGH;
case 'x':
case 'Y':
if (((type->getPrimitiveSizeInBits() == 128) && Subtarget.hasSSE1()) ||
((type->getPrimitiveSizeInBits() == 256) && Subtarget.hasFp256()))
weight = CW_Register;
break;
case 'k':
// Enable conditional vector operations using %k<#> registers.
weight = CW_SpecificReg;
break;
case 'I':
if (ConstantInt *C = dyn_cast<ConstantInt>(info.CallOperandVal)) {
if (C->getZExtValue() <= 31)
@ -32671,6 +32697,24 @@ X86TargetLowering::getRegForInlineAsmConstraint(const TargetRegisterInfo *TRI,
// TODO: Slight differences here in allocation order and leaving
// RIP in the class. Do they matter any more here than they do
// in the normal allocation?
case 'k':
if (Subtarget.hasAVX512()) {
// Only supported in AVX512 or later.
switch (VT.SimpleTy) {
default: break;
case MVT::i32:
return std::make_pair(0U, &X86::VK32RegClass);
case MVT::i16:
return std::make_pair(0U, &X86::VK16RegClass);
case MVT::i8:
return std::make_pair(0U, &X86::VK8RegClass);
case MVT::i1:
return std::make_pair(0U, &X86::VK1RegClass);
case MVT::i64:
return std::make_pair(0U, &X86::VK64RegClass);
}
}
break;
case 'q': // GENERAL_REGS in 64-bit mode, Q_REGS in 32-bit mode.
if (Subtarget.is64Bit()) {
if (VT == MVT::i32 || VT == MVT::f32)
@ -32772,6 +32816,29 @@ X86TargetLowering::getRegForInlineAsmConstraint(const TargetRegisterInfo *TRI,
}
break;
}
} else if (Constraint.size() == 2 && Constraint[0] == 'Y') {
switch (Constraint[1]) {
default:
break;
case 'k':
// This register class doesn't allocate k0 for masked vector operation.
if (Subtarget.hasAVX512()) { // Only supported in AVX512.
switch (VT.SimpleTy) {
default: break;
case MVT::i32:
return std::make_pair(0U, &X86::VK32WMRegClass);
case MVT::i16:
return std::make_pair(0U, &X86::VK16WMRegClass);
case MVT::i8:
return std::make_pair(0U, &X86::VK8WMRegClass);
case MVT::i1:
return std::make_pair(0U, &X86::VK1WMRegClass);
case MVT::i64:
return std::make_pair(0U, &X86::VK64WMRegClass);
}
}
break;
}
}
// Use the default implementation in TargetLowering to convert the register