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Fix X86TargetLowering::LowerExternalSymbol so that it actually works in non-trivial cases. This hasn't been an issue before because the function isn't normally called (but apparently is used to generate a tail-call to sin() on ELF x86-32 with PIC and SSE2).

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Fixes PR9693.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137292 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eli Friedman 2011-08-11 01:48:05 +00:00
parent 78eb93c591
commit 586272d67c
2 changed files with 40 additions and 5 deletions
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21
lib/Target/X86/X86ISelLowering.cpp
View File

@ -6758,12 +6758,17 @@ X86TargetLowering::LowerExternalSymbol(SDValue Op, SelectionDAG &DAG) const {
CodeModel::Model M = getTargetMachine().getCodeModel();
if (Subtarget->isPICStyleRIPRel() &&
(M == CodeModel::Small || M == CodeModel::Kernel))
(M == CodeModel::Small || M == CodeModel::Kernel)) {
if (Subtarget->isTargetDarwin() || Subtarget->isTargetELF())
OpFlag = X86II::MO_GOTPCREL;
WrapperKind = X86ISD::WrapperRIP;
else if (Subtarget->isPICStyleGOT())
OpFlag = X86II::MO_GOTOFF;
else if (Subtarget->isPICStyleStubPIC())
OpFlag = X86II::MO_PIC_BASE_OFFSET;
} else if (Subtarget->isPICStyleGOT()) {
OpFlag = X86II::MO_GOT;
} else if (Subtarget->isPICStyleStubPIC()) {
OpFlag = X86II::MO_DARWIN_NONLAZY_PIC_BASE;
} else if (Subtarget->isPICStyleStubNoDynamic()) {
OpFlag = X86II::MO_DARWIN_NONLAZY;
}
SDValue Result = DAG.getTargetExternalSymbol(Sym, getPointerTy(), OpFlag);
@ -6780,6 +6785,12 @@ X86TargetLowering::LowerExternalSymbol(SDValue Op, SelectionDAG &DAG) const {
Result);
}
// For symbols that require a load from a stub to get the address, emit the
// load.
if (isGlobalStubReference(OpFlag))
Result = DAG.getLoad(getPointerTy(), DL, DAG.getEntryNode(), Result,
MachinePointerInfo::getGOT(), false, false, 0);
return Result;
}

24
test/CodeGen/X86/tail-call-got.ll Normal file
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@ -0,0 +1,24 @@
; RUN: llc < %s -relocation-model=pic | FileCheck %s
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-f80:32:32-n8:16:32"
target triple = "i386-unknown-freebsd9.0"
define double @test1(double %x) nounwind readnone {
; CHECK: test1:
; CHECK: movl foo@GOT
; CHECK-NEXT: jmpl
%1 = tail call double @foo(double %x) nounwind readnone
ret double %1
}
declare double @foo(double) readnone
define double @test2(double %x) nounwind readnone {
; CHECK: test2:
; CHECK: movl sin@GOT
; CHECK-NEXT: jmpl
%1 = tail call double @sin(double %x) nounwind readnone
ret double %1
}
declare double @sin(double) readnone