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[AMDGPU][llvm-mc] Predefined symbols to access -mcpu from the assembly source (.option.machine_version...)

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The feature allows for conditional assembly etc.
TODO: make those symbols read-only.
Test added.

Differential Revision: http://reviews.llvm.org/D21238

llvm-svn: 272673
This commit is contained in:
Artem Tamazov 2016-06-14 15:03:59 +00:00
parent fd3d54b8e1
commit 1b18af3b37
2 changed files with 63 additions and 2 deletions
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17
lib/Target/AMDGPU/AsmParser/AMDGPUAsmParser.cpp
View File

@ -60,8 +60,6 @@ class AMDGPUOperand : public MCParsedAsmOperand {
public:
AMDGPUOperand(enum KindTy K) : MCParsedAsmOperand(), Kind(K) {}
MCContext *Ctx;
typedef std::unique_ptr<AMDGPUOperand> Ptr;
struct Modifiers {
@ -586,6 +584,21 @@ public:
}
setAvailableFeatures(ComputeAvailableFeatures(getSTI().getFeatureBits()));
{
// TODO: make those pre-defined variables read-only.
// Currently there is none suitable machinery in the core llvm-mc for this.
// MCSymbol::isRedefinable is intended for another purpose, and
// AsmParser::parseDirectiveSet() cannot be specialized for specific target.
AMDGPU::IsaVersion Isa = AMDGPU::getIsaVersion(getSTI().getFeatureBits());
MCContext &Ctx = getContext();
MCSymbol *Sym = Ctx.getOrCreateSymbol(Twine(".option.machine_version_major"));
Sym->setVariableValue(MCConstantExpr::create(Isa.Major, Ctx));
Sym = Ctx.getOrCreateSymbol(Twine(".option.machine_version_minor"));
Sym->setVariableValue(MCConstantExpr::create(Isa.Minor, Ctx));
Sym = Ctx.getOrCreateSymbol(Twine(".option.machine_version_stepping"));
Sym->setVariableValue(MCConstantExpr::create(Isa.Stepping, Ctx));
}
}
AMDGPUTargetStreamer &getTargetStreamer() {

48
test/MC/AMDGPU/symbol_special.s Normal file
View File

@ -0,0 +1,48 @@
// RUN: llvm-mc -arch=amdgcn -mcpu=bonaire %s | FileCheck %s --check-prefix=BONAIRE
// RUN: llvm-mc -arch=amdgcn -mcpu=hawaii %s | FileCheck %s --check-prefix=HAWAII
// RUN: llvm-mc -arch=amdgcn -mcpu=tonga %s | FileCheck %s --check-prefix=TONGA
// RUN: llvm-mc -arch=amdgcn -mcpu=fiji %s | FileCheck %s --check-prefix=FIJI
.if .option.machine_version_major == 0
.byte 0
.elseif .option.machine_version_major == 7
.byte 7
.elseif .option.machine_version_major == 8
.byte 8
.else
.error "major unknown"
.endif
// BONAIRE: .byte 7
// HAWAII: .byte 7
// TONGA: .byte 8
// FIJI: .byte 8
.if .option.machine_version_minor == 0
.byte 0
.else
.error "minor unknown"
.endif
// BONAIRE: .byte 0
// HAWAII: .byte 0
// TONGA: .byte 0
// FIJI: .byte 0
.if .option.machine_version_stepping == 0
.byte 0
.elseif .option.machine_version_stepping == 1
.byte 1
.elseif .option.machine_version_stepping == 3
.byte 3
.else
.error "stepping unknown"
.endif
// BONAIRE: .byte 0
// HAWAII: .byte 1
// TONGA: .byte 0
// FIJI: .byte 3
v_add_f32 v0, v0, v[.option.machine_version_major]
// BONAIRE: v_add_f32_e32 v0, v0, v7
// HAWAII: v_add_f32_e32 v0, v0, v7
// TONGA: v_add_f32_e32 v0, v0, v8
// FIJI: v_add_f32_e32 v0, v0, v8