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X86FastISel doesn't support the -tailcallopt ABI.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70902 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2009-05-04 19:50:33 +00:00
parent 28f1412c97
commit 7d04e4a7c0
2 changed files with 19 additions and 0 deletions
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6
lib/Target/X86/X86FastISel.cpp
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@ -30,6 +30,7 @@
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/Support/CallSite.h"
#include "llvm/Support/GetElementPtrTypeIterator.h"
#include "llvm/Target/TargetOptions.h"
using namespace llvm;
namespace {
@ -1115,6 +1116,11 @@ bool X86FastISel::X86SelectCall(Instruction *I) {
CC != CallingConv::X86_FastCall)
return false;
// On X86, -tailcallopt changes the fastcc ABI. FastISel doesn't
// handle this for now.
if (CC == CallingConv::Fast && PerformTailCallOpt)
return false;
// Let SDISel handle vararg functions.
const PointerType *PT = cast<PointerType>(CS.getCalledValue()->getType());
const FunctionType *FTy = cast<FunctionType>(PT->getElementType());

13
test/CodeGen/X86/fast-isel-tailcall.ll Normal file
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@ -0,0 +1,13 @@
; RUN: llvm-as < %s | llc -fast-isel -tailcallopt -march=x86 | not grep add
; PR4154
; On x86, -tailcallopt changes the ABI so the caller shouldn't readjust
; the stack pointer after the call in this code.
define i32 @stub(i8* %t0) nounwind {
entry:
%t1 = load i32* inttoptr (i32 139708680 to i32*) ; <i32> [#uses=1]
%t2 = bitcast i8* %t0 to i32 (i32)* ; <i32 (i32)*> [#uses=1]
%t3 = call fastcc i32 %t2(i32 %t1) ; <i32> [#uses=1]
ret i32 %t3
}