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Optimize local func calls to not emit nop for TOC restoration.

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Patch by Adhemerval Zanella.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@164138 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Roman Divacky 2012-09-18 16:47:58 +00:00
parent 10a4318248
commit eb8b7dc536
2 changed files with 59 additions and 2 deletions
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12
lib/Target/PowerPC/PPCISelLowering.cpp
View File

@ -2808,6 +2808,14 @@ unsigned PrepareCall(SelectionDAG &DAG, SDValue &Callee, SDValue &InFlag,
return CallOpc;
}
static
bool isLocalCall(const SDValue &Callee)
{
if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee))
return !G->getGlobal()->isDeclaration();
return false;
}
SDValue
PPCTargetLowering::LowerCallResult(SDValue Chain, SDValue InFlag,
CallingConv::ID CallConv, bool isVarArg,
@ -2916,8 +2924,8 @@ PPCTargetLowering::FinishCall(CallingConv::ID CallConv, DebugLoc dl,
// from allocating it), resulting in an additional register being
// allocated and an unnecessary move instruction being generated.
needsTOCRestore = true;
} else if (CallOpc == PPCISD::CALL_SVR4) {
// Otherwise insert NOP.
} else if ((CallOpc == PPCISD::CALL_SVR4) && !isLocalCall(Callee)) {
// Otherwise insert NOP for non-local calls.
CallOpc = PPCISD::CALL_NOP_SVR4;
}
}

49
test/CodeGen/PowerPC/ppc64-calls.ll Normal file
View File

@ -0,0 +1,49 @@
; RUN: llc < %s -march=ppc64 | FileCheck %s
target datalayout = "E-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v128:128:128-n32:64"
target triple = "powerpc64-unknown-linux-gnu"
define void @foo() nounwind readnone noinline {
ret void
}
; Calls to local function does not require the TOC restore 'nop'
define void @test_direct() nounwind readnone {
; CHECK: test_direct:
tail call void @foo() nounwind
; CHECK: bl foo
; CHECK-NOT: nop
ret void
}
; Indirect calls requires a full stub creation
define void @test_indirect(void ()* nocapture %fp) nounwind {
; CHECK: test_indirect:
tail call void %fp() nounwind
; CHECK: ld [[FP:[0-9]+]], 0(3)
; CHECK: ld 11, 16(3)
; CHECK: ld 2, 8(3)
; CHECK-NEXT: mtctr [[FP]]
; CHECK-NEXT: bctrl
; CHECK-NEXT: ld 2, 40(1)
ret void
}
; Absolute vales should be have the TOC restore 'nop'
define void @test_abs() nounwind {
; CHECK: test_abs:
tail call void inttoptr (i64 1024 to void ()*)() nounwind
; CHECK: bla 1024
; CHECK-NEXT: nop
ret void
}
declare double @sin(double) nounwind
; External functions call should also have a 'nop'
define double @test_external(double %x) nounwind {
; CHECK: test_external:
%call = tail call double @sin(double %x) nounwind
; CHECK: bl sin
; CHECK-NEXT: nop
ret double %call
}