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fix an oversight which caused us to compile the testcase (and other

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less trivial things) into a dummy lea.  Before we generated:

_test:                                  ## @test
	movq	_G@GOTPCREL(%rip), %rax
	leaq	(%rax), %rax
	ret

now we produce:

_test:                                  ## @test
	movq	_G@GOTPCREL(%rip), %rax
	ret

This is part of rdar://9289558

llvm-svn: 129662
This commit is contained in:
Chris Lattner 2011-04-17 17:12:08 +00:00
parent 1f1f7f2742
commit f9d9976374
3 changed files with 22 additions and 9 deletions
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8
lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
View File

@ -421,10 +421,9 @@ bool SelectionDAGISel::runOnMachineFunction(MachineFunction &mf) {
return true;
}
void
SelectionDAGISel::SelectBasicBlock(BasicBlock::const_iterator Begin,
BasicBlock::const_iterator End,
bool &HadTailCall) {
void SelectionDAGISel::SelectBasicBlock(BasicBlock::const_iterator Begin,
BasicBlock::const_iterator End,
bool &HadTailCall) {
// Lower all of the non-terminator instructions. If a call is emitted
// as a tail call, cease emitting nodes for this block. Terminators
// are handled below.
@ -438,7 +437,6 @@ SelectionDAGISel::SelectBasicBlock(BasicBlock::const_iterator Begin,
// Final step, emit the lowered DAG as machine code.
CodeGenAndEmitDAG();
return;
}
void SelectionDAGISel::ComputeLiveOutVRegInfo() {

11
lib/Target/X86/X86FastISel.cpp
View File

@ -1859,10 +1859,13 @@ unsigned X86FastISel::TargetMaterializeConstant(const Constant *C) {
if (isa<GlobalValue>(C)) {
X86AddressMode AM;
if (X86SelectAddress(C, AM)) {
if (TLI.getPointerTy() == MVT::i32)
Opc = X86::LEA32r;
else
Opc = X86::LEA64r;
// If the expression is just a basereg, then we're done, otherwise we need
// to emit an LEA.
if (AM.BaseType == X86AddressMode::RegBase &&
AM.IndexReg == 0 && AM.Disp == 0 && AM.GV == 0)
return AM.Base.Reg;
Opc = TLI.getPointerTy() == MVT::i32 ? X86::LEA32r : X86::LEA64r;
unsigned ResultReg = createResultReg(RC);
addFullAddress(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
TII.get(Opc), ResultReg), AM);

12
test/CodeGen/X86/fast-isel-x86-64.ll
View File

@ -33,3 +33,15 @@ if.end: ; preds = %if.then, %entry
; CHECK: test2:
; CHECK: movq %rdi, -8(%rsp)
; CHECK: cmpq $42, -8(%rsp)
@G = external global i32
define i64 @test3() nounwind {
%A = ptrtoint i32* @G to i64
ret i64 %A
}
; CHECK: test3:
; CHECK: movq _G@GOTPCREL(%rip), %rax
; CHECK-NEXT: ret