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Allow trivial sibcall of vararg callee when no arguments are being passed.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@99598 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -2301,8 +2301,9 @@ X86TargetLowering::IsEligibleForTailCallOptimization(SDValue Callee,
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// Look for obvious safe cases to perform tail call optimization that does not
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// Look for obvious safe cases to perform tail call optimization that does not
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// requite ABI changes. This is what gcc calls sibcall.
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// requite ABI changes. This is what gcc calls sibcall.
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// Do not sibcall optimize vararg calls for now.
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// Do not sibcall optimize vararg calls unless the call site is not passing any
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if (isVarArg)
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// arguments.
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if (isVarArg && !Outs.empty())
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return false;
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return false;
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// Also avoid sibcall optimization if either caller or callee uses struct
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// Also avoid sibcall optimization if either caller or callee uses struct
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@ -194,10 +194,10 @@ bb12:
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; LINUX: .LJTI8_0:
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; LINUX: .LJTI8_0:
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; LINUX: .long .LBB8_2@GOTOFF
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; LINUX: .long .LBB8_2@GOTOFF
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; LINUX: .long .LBB8_2@GOTOFF
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; LINUX: .long .LBB8_8@GOTOFF
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; LINUX: .long .LBB8_7@GOTOFF
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; LINUX: .long .LBB8_14@GOTOFF
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; LINUX: .long .LBB8_3@GOTOFF
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; LINUX: .long .LBB8_9@GOTOFF
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; LINUX: .long .LBB8_7@GOTOFF
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; LINUX: .long .LBB8_10@GOTOFF
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}
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}
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declare void @foo1(...)
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declare void @foo1(...)
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@ -271,3 +271,34 @@ entry:
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}
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}
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declare double @bar4()
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declare double @bar4()
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; rdar://6283267
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define void @t17() nounwind ssp {
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entry:
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; 32: t17:
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; 32: jmp {{_?}}bar5
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; 64: t17:
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; 64: xorb %al, %al
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; 64: jmp {{_?}}bar5
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tail call void (...)* @bar5() nounwind
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ret void
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}
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declare void @bar5(...)
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; rdar://7774847
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define void @t18() nounwind ssp {
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entry:
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; 32: t18:
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; 32: call {{_?}}bar6
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; 32: fstp %st(0)
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; 64: t18:
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; 64: xorb %al, %al
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; 64: jmp {{_?}}bar6
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%0 = tail call double (...)* @bar6() nounwind
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ret void
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}
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declare double @bar6(...)
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@ -43,7 +43,7 @@ define i32 @t2(i32 %x, i32 %y) nounwind ssp {
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; X32: cmpl
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; X32: cmpl
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; X32: sete
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; X32: sete
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; X32-NOT: xor
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; X32-NOT: xor
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; X32: je
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; X32: jne
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; X64: t2:
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; X64: t2:
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; X64: testl
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; X64: testl
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@ -51,7 +51,7 @@ define i32 @t2(i32 %x, i32 %y) nounwind ssp {
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; X64: testl
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; X64: testl
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; X64: sete
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; X64: sete
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; X64-NOT: xor
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; X64-NOT: xor
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; X64: je
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; X64: jne
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entry:
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entry:
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%0 = icmp eq i32 %x, 0 ; <i1> [#uses=1]
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%0 = icmp eq i32 %x, 0 ; <i1> [#uses=1]
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%1 = icmp eq i32 %y, 0 ; <i1> [#uses=1]
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%1 = icmp eq i32 %y, 0 ; <i1> [#uses=1]
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