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Handle IMPLICIT_DEF instructions in X86FloatingPoint.

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This fixes PR10575.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136787 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2011-08-03 16:33:19 +00:00
parent e3fbe6c0fb
commit 56e3232d5a
2 changed files with 33 additions and 1 deletions
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13
lib/Target/X86/X86FloatingPoint.cpp
View File

@ -406,6 +406,10 @@ bool FPS::processBasicBlock(MachineFunction &MF, MachineBasicBlock &BB) {
if (MI->isCopy() && isFPCopy(MI))
FPInstClass = X86II::SpecialFP;
if (MI->isImplicitDef() &&
X86::RFP80RegClass.contains(MI->getOperand(0).getReg()))
FPInstClass = X86II::SpecialFP;
if (FPInstClass == X86II::NotFP)
continue; // Efficiently ignore non-fp insts!
@ -1369,6 +1373,15 @@ void FPS::handleSpecialFP(MachineBasicBlock::iterator &I) {
break;
}
case TargetOpcode::IMPLICIT_DEF: {
// All FP registers must be explicitly defined, so load a 0 instead.
unsigned Reg = MI->getOperand(0).getReg() - X86::FP0;
DEBUG(dbgs() << "Emitting LD_F0 for implicit FP" << Reg << '\n');
BuildMI(*MBB, I, MI->getDebugLoc(), TII->get(X86::LD_F0));
pushReg(Reg);
break;
}
case X86::FpPOP_RETVAL: {
// The FpPOP_RETVAL instruction is used after calls that return a value on
// the floating point stack. We cannot model this with ST defs since CALL

21
test/CodeGen/X86/fp-stack-O0-crash.ll
View File

@ -1,4 +1,4 @@
; RUN: llc %s -O0 -fast-isel -regalloc=fast -o -
; RUN: llc %s -O0 -fast-isel -regalloc=fast -mcpu=i386 -o -
; PR4767
target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
@ -28,3 +28,22 @@ if.then: ; preds = %cond.false, %cond.t
if.end: ; preds = %if.then, %cond.false, %cond.true
ret void
}
; PR10575
; This produces a FP0 = IMPLICIT_DEF instruction.
define void @__m_rankmerge_MOD_dindexmerge_() nounwind {
entry:
br label %"20"
"20": ; preds = %"23", %entry
%0 = phi double [ undef, %entry ], [ %0, %"23" ]
%1 = phi double [ 0.000000e+00, %entry ], [ %2, %"23" ]
br i1 undef, label %"21", label %"23"
"21": ; preds = %"20"
ret void
"23": ; preds = %"20"
%2 = select i1 undef, double %0, double %1
br label %"20"
}