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Use %rip-relative addressing on x86-64 whenever practical, as

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it has a smaller encoding than absolute addressing.

llvm-svn: 67002
This commit is contained in:
Dan Gohman 2009-03-14 02:33:41 +00:00
parent e7495ef7aa
commit fd6debff99
2 changed files with 16 additions and 8 deletions
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17
lib/Target/X86/AsmPrinter/X86ATTAsmPrinter.cpp
View File

@ -471,14 +471,15 @@ void X86ATTAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
O << "@GOT";
else
O << "@GOTOFF";
} else if (Subtarget->isPICStyleRIPRel() && !NotRIPRel &&
TM.getRelocationModel() != Reloc::Static) {
if (Subtarget->GVRequiresExtraLoad(GV, TM, false))
O << "@GOTPCREL";
} else if (Subtarget->isPICStyleRIPRel() && !NotRIPRel) {
if (TM.getRelocationModel() != Reloc::Static) {
if (Subtarget->GVRequiresExtraLoad(GV, TM, false))
O << "@GOTPCREL";
if (needCloseParen) {
needCloseParen = false;
O << ')';
if (needCloseParen) {
needCloseParen = false;
O << ')';
}
}
// Use rip when possible to reduce code size, except when
@ -692,7 +693,7 @@ bool X86ATTAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
switch (ExtraCode[0]) {
default: return true; // Unknown modifier.
case 'c': // Don't print "$" before a global var name or constant.
printOperand(MI, OpNo, "mem");
printOperand(MI, OpNo, "mem", /*NotRIPRel=*/true);
return false;
case 'b': // Print QImode register
case 'h': // Print QImode high register

7
test/CodeGen/X86/rip-rel-address.ll Normal file
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@ -0,0 +1,7 @@
; RUN: llvm-as < %s | llc -march=x86-64 -relocation-model=static | grep {a(%rip)}
@a = internal global double 3.4
define double @foo() nounwind {
%a = load double* @a
ret double %a
}