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Add fptrunc to mips fast-sel 

Summary: Implement conversion of 64 to 32 bit floating point numbers (fptrunc) in mips fast-isel

Test Plan:
fptrunc.ll
checked also with 4 internal mips build bot flavors mip32r1/miprs32r2 and at -O0 and -O2

Reviewers: dsanders

Reviewed By: dsanders

Subscribers: rfuhler

Differential Revision: http://reviews.llvm.org/D5553

llvm-svn: 218785
This commit is contained in:
Reed Kotler 2014-10-01 18:47:02 +00:00
parent 30c9242caa
commit b9dc248e9e
2 changed files with 45 additions and 0 deletions
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25
llvm/lib/Target/Mips/MipsFastISel.cpp
View File

@ -81,6 +81,7 @@ private:
bool SelectIntExt(const Instruction *I);
bool SelectTrunc(const Instruction *I);
bool SelectFPExt(const Instruction *I);
bool SelectFPTrunc(const Instruction *I);
bool isTypeLegal(Type *Ty, MVT &VT);
bool isLoadTypeLegal(Type *Ty, MVT &VT);
@ -406,6 +407,28 @@ bool MipsFastISel::SelectFPExt(const Instruction *I) {
return true;
}
// Attempt to fast-select a floating-point truncate instruction.
bool MipsFastISel::SelectFPTrunc(const Instruction *I) {
Value *Src = I->getOperand(0);
EVT SrcVT = TLI.getValueType(Src->getType(), true);
EVT DestVT = TLI.getValueType(I->getType(), true);
if (SrcVT != MVT::f64 || DestVT != MVT::f32)
return false;
unsigned SrcReg = getRegForValue(Src);
if (!SrcReg)
return false;
unsigned DestReg = createResultReg(&Mips::FGR32RegClass);
if (!DestReg)
return false;
EmitInst(Mips::CVT_S_D32, DestReg).addReg(SrcReg);
updateValueMap(I, DestReg);
return true;
}
bool MipsFastISel::SelectIntExt(const Instruction *I) {
Type *DestTy = I->getType();
Value *Src = I->getOperand(0);
@ -475,6 +498,8 @@ bool MipsFastISel::fastSelectInstruction(const Instruction *I) {
case Instruction::ZExt:
case Instruction::SExt:
return SelectIntExt(I);
case Instruction::FPTrunc:
return SelectFPTrunc(I);
case Instruction::FPExt:
return SelectFPExt(I);
}

20
llvm/test/CodeGen/Mips/Fast-ISel/fptrunc.ll Normal file
View File

@ -0,0 +1,20 @@
; RUN: llc -march=mipsel -relocation-model=pic -O0 -mips-fast-isel -fast-isel-abort -mcpu=mips32r2 \
; RUN: < %s | FileCheck %s
; RUN: llc -march=mipsel -relocation-model=pic -O0 -mips-fast-isel -fast-isel-abort -mcpu=mips32 \
; RUN: < %s | FileCheck %s
@d = global double 0x40147E6B74DF0446, align 8
@f = common global float 0.000000e+00, align 4
@.str = private unnamed_addr constant [6 x i8] c"%f \0A\00", align 1
; Function Attrs: nounwind
define void @fv() #0 {
entry:
%0 = load double* @d, align 8
%conv = fptrunc double %0 to float
; CHECK: cvt.s.d $f{{[0-9]+}}, $f{{[0-9]+}}
store float %conv, float* @f, align 4
ret void
}
attributes #1 = { nounwind }