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x32. Fixes a bug in x32 exception handling.

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This patch updates the X86 lowering so that the Exception Pointer and Selector
are 64-bit wide only if Subtarget.isTarget64BitLP64.

Patch by João Porto

Reviewers: dschuff, rnk
Differential Revision: http://reviews.llvm.org/D12111

llvm-svn: 245454
This commit is contained in:
Derek Schuff 2015-08-19 16:28:21 +00:00
parent 3ff38c2bd2
commit 5d333b2d27
2 changed files with 28 additions and 1 deletions
lib/Target/X86
X86ISelLowering.cpp
test/CodeGen/X86
x32-landingpad.ll

2
lib/Target/X86/X86ISelLowering.cpp

@ -469,7 +469,7 @@ X86TargetLowering::X86TargetLowering(const X86TargetMachine &TM,
setOperationAction(ISD::EH_LABEL, MVT::Other, Expand);
}
if (Subtarget->is64Bit()) {
if (Subtarget->isTarget64BitLP64()) {
setExceptionPointerRegister(X86::RAX);
setExceptionSelectorRegister(X86::RDX);
} else {

27
test/CodeGen/X86/x32-landingpad.ll Normal file

@ -0,0 +1,27 @@
; RUN: llc < %s -mtriple=x86_64-none-none-gnux32 -mcpu=generic | FileCheck %s
; RUN: llc < %s -mtriple=x86_64-none-none-gnux32 -mcpu=generic -fast-isel | FileCheck %s
;
; Ensures that landingpad instructions in x32 use the right Exception Pointer
; and Exception Selector registers.
declare void @foo()
declare void @bar(i8*, i32) noreturn
declare i32 @__gxx_personality_v0(...)
define void @test1() uwtable personality i32 (...)* @__gxx_personality_v0 {
entry:
invoke void @foo() to label %done unwind label %lpad
done:
ret void
lpad:
%0 = landingpad { i8*, i32 } cleanup
; The Exception Pointer is %eax; the Exception Selector, %edx.
; CHECK: LBB{{[^%]*}} %lpad
; CHECK-DAG: movl %eax, {{.*}}
; CHECK-DAG: movl %edx, {{.*}}
; CHECK: callq bar
%1 = extractvalue { i8*, i32 } %0, 0
%2 = extractvalue { i8*, i32 } %0, 1
call void @bar(i8* %1, i32 %2)
unreachable
}