mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-21 03:29:40 +00:00
Don't let a noalias difference disrupt the tailcall optimization.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@88672 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
parent
0d1680a7d8
commit
01205a80f5
@ -4349,7 +4349,7 @@ SelectionDAGLowering::visitIntrinsicCall(CallInst &I, unsigned Intrinsic) {
|
||||
/// TargetLowering::IsEligibleForTailCallOptimization.
|
||||
///
|
||||
static bool
|
||||
isInTailCallPosition(const Instruction *I, Attributes RetAttr,
|
||||
isInTailCallPosition(const Instruction *I, Attributes CalleeRetAttr,
|
||||
const TargetLowering &TLI) {
|
||||
const BasicBlock *ExitBB = I->getParent();
|
||||
const TerminatorInst *Term = ExitBB->getTerminator();
|
||||
@ -4377,8 +4377,9 @@ isInTailCallPosition(const Instruction *I, Attributes RetAttr,
|
||||
if (!Ret || Ret->getNumOperands() == 0) return true;
|
||||
|
||||
// Conservatively require the attributes of the call to match those of
|
||||
// the return.
|
||||
if (F->getAttributes().getRetAttributes() != RetAttr)
|
||||
// the return. Ignore noalias because it doesn't affect the call sequence.
|
||||
unsigned CallerRetAttr = F->getAttributes().getRetAttributes();
|
||||
if ((CalleeRetAttr ^ CallerRetAttr) & ~Attribute::NoAlias)
|
||||
return false;
|
||||
|
||||
// Otherwise, make sure the unmodified return value of I is the return value.
|
||||
|
@ -1,4 +1,4 @@
|
||||
; RUN: llc < %s -march=x86 -tailcallopt | grep TAILCALL
|
||||
; RUN: llc < %s -march=x86 -tailcallopt | grep TAILCALL | count 3
|
||||
define fastcc i32 @tailcallee(i32 %a1, i32 %a2, i32 %a3, i32 %a4) {
|
||||
entry:
|
||||
ret i32 %a3
|
||||
@ -9,3 +9,17 @@ entry:
|
||||
%tmp11 = tail call fastcc i32 @tailcallee( i32 %in1, i32 %in2, i32 %in1, i32 %in2 ) ; <i32> [#uses=1]
|
||||
ret i32 %tmp11
|
||||
}
|
||||
|
||||
declare fastcc i8* @alias_callee()
|
||||
|
||||
define fastcc noalias i8* @noalias_caller() nounwind {
|
||||
%p = tail call fastcc i8* @alias_callee()
|
||||
ret i8* %p
|
||||
}
|
||||
|
||||
declare fastcc noalias i8* @noalias_callee()
|
||||
|
||||
define fastcc i8* @alias_caller() nounwind {
|
||||
%p = tail call fastcc noalias i8* @noalias_callee()
|
||||
ret i8* %p
|
||||
}
|
||||
|
Loading…
Reference in New Issue
Block a user