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[X86] Enable soft float ABI for x86 

The Intel MCU psABI requires floating-point values to be passed in-reg.
This makes the x86-32 ABI code respect "-mfloat-abi soft" and generate float inreg arguments.

Differential Revision: http://reviews.llvm.org/D13554

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@250689 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Michael Kuperstein 2015-10-19 08:09:43 +00:00
parent 5b599a4eb8
commit d3ecbca703
2 changed files with 22 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
lib/CodeGen/TargetInfo.cpp
View File

@ -798,6 +798,7 @@ class X86_32ABIInfo : public ABIInfo {
bool IsDarwinVectorABI;
bool IsRetSmallStructInRegABI;
bool IsWin32StructABI;
bool IsSoftFloatABI;
unsigned DefaultNumRegisterParameters;
static bool isRegisterSize(unsigned Size) {
@ -847,21 +848,22 @@ public:
X86_32ABIInfo(CodeGen::CodeGenTypes &CGT, bool DarwinVectorABI,
bool RetSmallStructInRegABI, bool Win32StructABI,
unsigned NumRegisterParameters)
unsigned NumRegisterParameters, bool SoftFloatABI)
: ABIInfo(CGT), IsDarwinVectorABI(DarwinVectorABI),
IsRetSmallStructInRegABI(RetSmallStructInRegABI),
IsWin32StructABI(Win32StructABI),
DefaultNumRegisterParameters(NumRegisterParameters) {}
DefaultNumRegisterParameters(NumRegisterParameters),
IsSoftFloatABI(SoftFloatABI) {}
};
class X86_32TargetCodeGenInfo : public TargetCodeGenInfo {
public:
X86_32TargetCodeGenInfo(CodeGen::CodeGenTypes &CGT, bool DarwinVectorABI,
bool RetSmallStructInRegABI, bool Win32StructABI,
unsigned NumRegisterParameters)
: TargetCodeGenInfo(
new X86_32ABIInfo(CGT, DarwinVectorABI, RetSmallStructInRegABI,
Win32StructABI, NumRegisterParameters)) {}
unsigned NumRegisterParameters, bool SoftFloatABI)
: TargetCodeGenInfo(new X86_32ABIInfo(
CGT, DarwinVectorABI, RetSmallStructInRegABI, Win32StructABI,
NumRegisterParameters, SoftFloatABI)) {}
static bool isStructReturnInRegABI(
const llvm::Triple &Triple, const CodeGenOptions &Opts);
@ -1212,9 +1214,11 @@ X86_32ABIInfo::Class X86_32ABIInfo::classify(QualType Ty) const {
bool X86_32ABIInfo::shouldUseInReg(QualType Ty, CCState &State,
bool &NeedsPadding) const {
NeedsPadding = false;
Class C = classify(Ty);
if (C == Float)
return false;
if (!IsSoftFloatABI) {
Class C = classify(Ty);
if (C == Float)
return false;
}
unsigned Size = getContext().getTypeSize(Ty);
unsigned SizeInRegs = (Size + 31) / 32;
@ -1885,7 +1889,7 @@ public:
bool DarwinVectorABI, bool RetSmallStructInRegABI, bool Win32StructABI,
unsigned NumRegisterParameters)
: X86_32TargetCodeGenInfo(CGT, DarwinVectorABI, RetSmallStructInRegABI,
Win32StructABI, NumRegisterParameters) {}
Win32StructABI, NumRegisterParameters, false) {}
void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV,
CodeGen::CodeGenModule &CGM) const override;
@ -7397,7 +7401,8 @@ const TargetCodeGenInfo &CodeGenModule::getTargetCodeGenInfo() {
} else {
return *(TheTargetCodeGenInfo = new X86_32TargetCodeGenInfo(
Types, IsDarwinVectorABI, RetSmallStructInRegABI,
IsWin32FloatStructABI, CodeGenOpts.NumRegisterParameters));
IsWin32FloatStructABI, CodeGenOpts.NumRegisterParameters,
CodeGenOpts.FloatABI == "soft"));
}
}

6
test/CodeGen/x86-soft-float.c Normal file
View File

@ -0,0 +1,6 @@
// RUN: %clang_cc1 -triple i386-unknown-unknown -mregparm 3 -emit-llvm %s -o - | FileCheck %s -check-prefix=HARD
// RUN: %clang_cc1 -triple i386-unknown-unknown -mregparm 3 -mfloat-abi soft -emit-llvm %s -o - | FileCheck %s -check-prefix=SOFT
// HARD: define void @f1(float %a)
// SOFT: define void @f1(float inreg %a)
void f1(float a) {}