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[X86] Fix the lowering of setjmp intrinsic on i386. 

When the lowering of the setjmp intrinsic requires
a global base pointer to be set, make sure such pointer
gets defined by the CGBR pass.

This fixes PR26742.

llvm-svn: 262762
This commit is contained in:
Quentin Colombet 2016-03-05 00:31:04 +00:00
parent 888f2c33d4
commit 2a7676b442
2 changed files with 33 additions and 0 deletions
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10
llvm/lib/Target/X86/X86ISelLowering.cpp
View File

@ -18322,6 +18322,16 @@ SDValue X86TargetLowering::LowerEH_RETURN(SDValue Op, SelectionDAG &DAG) const {
SDValue X86TargetLowering::lowerEH_SJLJ_SETJMP(SDValue Op,
SelectionDAG &DAG) const {
SDLoc DL(Op);
// If the subtarget is not 64bit, we may need the global base reg
// after isel expand pseudo, i.e., after CGBR pass ran.
// Therefore, ask for the GlobalBaseReg now, so that the pass
// inserts the code for us in case we need it.
// Otherwise, we will end up in a situation where we will
// reference a virtual register that is not defined!
if (!Subtarget.is64Bit()) {
const X86InstrInfo *TII = Subtarget.getInstrInfo();
(void)TII->getGlobalBaseReg(&DAG.getMachineFunction());
}
return DAG.getNode(X86ISD::EH_SJLJ_SETJMP, DL,
DAG.getVTList(MVT::i32, MVT::Other),
Op.getOperand(0), Op.getOperand(1));

23
llvm/test/CodeGen/X86/i386-setjmp-pic.ll Normal file
View File

@ -0,0 +1,23 @@
; RUN: llc -verify-machineinstrs -relocation-model=pic %s -o - | FileCheck %s
target datalayout = "e-m:o-p:32:32-f64:32:64-f80:128-n8:16:32-S128"
target triple = "i386-apple-macosx"
; Check that the register used as base pointer for setjmp
; is properly initialized.
; The test used to fail with the machine verifier complaining
; that the global base pointer is not initialized.
; PR26742.
;
; CHECK: test:
; CHECK: calll [[BP_SETUP_LABEL:L[$0-9a-zA-Z_-]+]]
; CHECK: [[BP_SETUP_LABEL]]:
; CHECK-NEXT: popl [[BP:%[a-z]+]]
;
; CHECK: leal [[BLOCK_ADDR:LBB[$0-9a-zA-Z_-]+]]-[[BP_SETUP_LABEL]]([[BP]]),
define i32 @test(i8* %tmp) {
entry:
%tmp9 = call i32 @llvm.eh.sjlj.setjmp(i8* %tmp)
ret i32 %tmp9
}
declare i32 @llvm.eh.sjlj.setjmp(i8*)