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Explicitly set the scale to 1 on some segstack prologue instrs.

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Patch by Brian Anderson.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147952 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2012-01-11 18:14:03 +00:00
parent 8704b7897d
commit 014f7a3b37
3 changed files with 8 additions and 4 deletions
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6
lib/Target/X86/X86FrameLowering.cpp
View File

@ -1385,10 +1385,10 @@ X86FrameLowering::adjustForSegmentedStacks(MachineFunction &MF) const {
ScratchReg = X86::RSP;
else
BuildMI(checkMBB, DL, TII.get(X86::LEA64r), ScratchReg).addReg(X86::RSP)
.addImm(0).addReg(0).addImm(-StackSize).addReg(0);
.addImm(1).addReg(0).addImm(-StackSize).addReg(0);
BuildMI(checkMBB, DL, TII.get(X86::CMP64rm)).addReg(ScratchReg)
.addReg(0).addImm(0).addReg(0).addImm(TlsOffset).addReg(TlsReg);
.addReg(0).addImm(1).addReg(0).addImm(TlsOffset).addReg(TlsReg);
} else {
TlsReg = X86::GS;
TlsOffset = 0x30;
@ -1397,7 +1397,7 @@ X86FrameLowering::adjustForSegmentedStacks(MachineFunction &MF) const {
ScratchReg = X86::ESP;
else
BuildMI(checkMBB, DL, TII.get(X86::LEA32r), ScratchReg).addReg(X86::ESP)
.addImm(0).addReg(0).addImm(-StackSize).addReg(0);
.addImm(1).addReg(0).addImm(-StackSize).addReg(0);
BuildMI(checkMBB, DL, TII.get(X86::CMP32rm)).addReg(ScratchReg)
.addReg(0).addImm(0).addReg(0).addImm(TlsOffset).addReg(TlsReg);

2
lib/Target/X86/X86ISelLowering.cpp
View File

@ -12066,7 +12066,7 @@ X86TargetLowering::EmitLoweredSegAlloca(MachineInstr *MI, MachineBasicBlock *BB,
BuildMI(BB, DL, TII->get(Is64Bit ? X86::SUB64rr:X86::SUB32rr), SPLimitVReg)
.addReg(tmpSPVReg).addReg(sizeVReg);
BuildMI(BB, DL, TII->get(Is64Bit ? X86::CMP64mr:X86::CMP32mr))
.addReg(0).addImm(0).addReg(0).addImm(TlsOffset).addReg(TlsReg)
.addReg(0).addImm(1).addReg(0).addImm(TlsOffset).addReg(TlsReg)
.addReg(SPLimitVReg);
BuildMI(BB, DL, TII->get(X86::JG_4)).addMBB(mallocMBB);

4
test/CodeGen/X86/segmented-stacks.ll
View File

@ -1,6 +1,10 @@
; RUN: llc < %s -mtriple=i686-linux -segmented-stacks -verify-machineinstrs | FileCheck %s -check-prefix=X32
; RUN: llc < %s -mtriple=x86_64-linux -segmented-stacks -verify-machineinstrs | FileCheck %s -check-prefix=X64
; We used to crash with filetype=obj
; RUN: llc < %s -mtriple=i686-linux -segmented-stacks -filetype=obj
; RUN: llc < %s -mtriple=x86_64-linux -segmented-stacks -filetype=obj
; Just to prevent the alloca from being optimized away
declare void @dummy_use(i32*, i32)