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[Target/X86] Don't use callee-saved registers in a Win64 tail call on non-Windows.

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Summary:
A small bit that I missed when I updated the X86 backend to account for
the Win64 calling convention on non-Windows. Now we don't use dead
non-volatile registers when emitting a Win64 indirect tail call on
non-Windows.

Should fix PR23710.

Test Plan: Added test for the correct behavior based on the case I posted to PR23710.

Reviewers: rnk

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D10258

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@239111 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Charles Davis
2015-06-04 22:50:05 +00:00
parent 27d60c99f7
commit 3e407efb8b
2 changed files with 26 additions and 2 deletions
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4
lib/Target/X86/X86RegisterInfo.cpp
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@@ -175,12 +175,12 @@ X86RegisterInfo::getPointerRegClass(const MachineFunction &MF,
return &X86::GR64_NOSPRegClass;
return &X86::GR32_NOSPRegClass;
case 2: // Available for tailcall (not callee-saved GPRs).
if (IsWin64)
const Function *F = MF.getFunction();
if (IsWin64 || (F && F->getCallingConv() == CallingConv::X86_64_Win64))
return &X86::GR64_TCW64RegClass;
else if (Is64Bit)
return &X86::GR64_TCRegClass;
const Function *F = MF.getFunction();
bool hasHipeCC = (F ? F->getCallingConv() == CallingConv::HiPE : false);
if (hasHipeCC)
return &X86::GR32RegClass;