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Implement FpSET_ST1_*.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64186 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2009-02-09 23:32:07 +00:00
parent 4ded02f8bd
commit a0eedac226
4 changed files with 34 additions and 6 deletions
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16
lib/Target/X86/X86FloatingPoint.cpp
View File

@ -982,7 +982,21 @@ void FPS::handleSpecialFP(MachineBasicBlock::iterator &I) {
case X86::FpSET_ST0_32:
case X86::FpSET_ST0_64:
case X86::FpSET_ST0_80:
assert(StackTop == 1 && "Stack should have one element on it to return!");
assert((StackTop == 1 || StackTop == 2)
&& "Stack should have one or two element on it to return!");
--StackTop; // "Forget" we have something on the top of stack!
break;
case X86::FpSET_ST1_32:
case X86::FpSET_ST1_64:
case X86::FpSET_ST1_80:
// StackTop can be 1 if a FpSET_ST0_* was before this. Exchange them.
if (StackTop == 1) {
BuildMI(*MBB, I, TII->get(X86::XCH_F)).addReg(X86::ST1);
NumFXCH++;
StackTop = 0;
break;
}
assert(StackTop == 2 && "Stack should have two element on it to return!");
--StackTop; // "Forget" we have something on the top of stack!
break;
case X86::MOV_Fp3232:

6
lib/Target/X86/X86InstrFPStack.td
View File

@ -151,6 +151,12 @@ def FpSET_ST0_64 : FpI_<(outs), (ins RFP64:$src), SpecialFP, []>; // ST(0) = FPR
def FpSET_ST0_80 : FpI_<(outs), (ins RFP80:$src), SpecialFP, []>; // ST(0) = FPR
}
let Defs = [ST1] in {
def FpSET_ST1_32 : FpI_<(outs), (ins RFP32:$src), SpecialFP, []>; // ST(1) = FPR
def FpSET_ST1_64 : FpI_<(outs), (ins RFP64:$src), SpecialFP, []>; // ST(1) = FPR
def FpSET_ST1_80 : FpI_<(outs), (ins RFP80:$src), SpecialFP, []>; // ST(1) = FPR
}
// FpIf32, FpIf64 - Floating Point Psuedo Instruction template.
// f32 instructions can use SSE1 and are predicated on FPStackf32 == !SSE1.
// f64 instructions can use SSE2 and are predicated on FPStackf64 == !SSE2.

11
lib/Target/X86/X86InstrInfo.cpp
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@ -1753,19 +1753,20 @@ bool X86InstrInfo::copyRegToReg(MachineBasicBlock &MBB,
// Moving to ST(0) turns into FpSET_ST0_32 etc.
if (DestRC == &X86::RSTRegClass) {
// Copying to ST(0). FIXME: handle ST(1) also
if (DestReg != X86::ST0)
// Copying to ST(0) / ST(1).
if (DestReg != X86::ST0 && DestReg != X86::ST1)
// Can only copy to TOS right now
return false;
bool isST0 = DestReg == X86::ST0;
unsigned Opc;
if (SrcRC == &X86::RFP32RegClass)
Opc = X86::FpSET_ST0_32;
Opc = isST0 ? X86::FpSET_ST0_32 : X86::FpSET_ST1_32;
else if (SrcRC == &X86::RFP64RegClass)
Opc = X86::FpSET_ST0_64;
Opc = isST0 ? X86::FpSET_ST0_64 : X86::FpSET_ST1_64;
else {
if (SrcRC != &X86::RFP80RegClass)
return false;
Opc = X86::FpSET_ST0_80;
Opc = isST0 ? X86::FpSET_ST0_80 : X86::FpSET_ST1_80;
}
BuildMI(MBB, MI, get(Opc)).addReg(SrcReg);
return true;

7
test/CodeGen/X86/fp-stack-set-st1.ll Normal file
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@ -0,0 +1,7 @@
; RUN: llvm-as < %s | llc -march=x86 | grep fxch | count 2
define i32 @main() nounwind {
entry:
%asmtmp = tail call { double, double } asm sideeffect "fmul\09%st(1),%st\0A\09fst\09%st(1)\0A\09frndint\0A\09fxch %st(1)\0A\09fsub\09%st(1),%st\0A\09f2xm1\0A\09", "={st},={st(1)},0,1,~{dirflag},~{fpsr},~{flags}"(double 0x4030FEFBD582097D, double 4.620000e+01) nounwind ; <{ double, double }> [#uses=0]
unreachable
}