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Fix X86's isLegalAddressingMode to recognize that static addresses

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need not be RIP-relative in small mode.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111917 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2010-08-24 15:55:12 +00:00
parent 2426668562
commit 92b651fb19
2 changed files with 34 additions and 1 deletions
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4
lib/Target/X86/X86ISelLowering.cpp
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@ -8171,6 +8171,7 @@ bool X86TargetLowering::isLegalAddressingMode(const AddrMode &AM,
const Type *Ty) const {
// X86 supports extremely general addressing modes.
CodeModel::Model M = getTargetMachine().getCodeModel();
Reloc::Model R = getTargetMachine().getRelocationModel();
// X86 allows a sign-extended 32-bit immediate field as a displacement.
if (!X86::isOffsetSuitableForCodeModel(AM.BaseOffs, M, AM.BaseGV != NULL))
@ -8190,7 +8191,8 @@ bool X86TargetLowering::isLegalAddressingMode(const AddrMode &AM,
return false;
// If lower 4G is not available, then we must use rip-relative addressing.
if (Subtarget->is64Bit() && (AM.BaseOffs || AM.Scale > 1))
if ((M != CodeModel::Small || R != Reloc::Static) &&
Subtarget->is64Bit() && (AM.BaseOffs || AM.Scale > 1))
return false;
}

31
test/CodeGen/X86/lsr-static-addr.ll Normal file
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@ -0,0 +1,31 @@
; RUN: llc -march=x86-64 -mtriple=x86_64-unknown-linux-gnu -relocation-model=static -asm-verbose=false < %s | FileCheck %s
; CHECK: xorl %eax, %eax
; CHECK: movsd .LCPI0_0(%rip), %xmm0
; CHECK: align
; CHECK-NEXT: BB0_2:
; CHECK-NEXT: movsd A(,%rax,8)
; CHECK-NEXT: mulsd
; CHECK-NEXT: movsd
; CHECK-NEXT: incq %rax
@A = external global [0 x double]
define void @foo(i64 %n) nounwind {
entry:
%cmp5 = icmp sgt i64 %n, 0
br i1 %cmp5, label %for.body, label %for.end
for.body:
%i.06 = phi i64 [ %inc, %for.body ], [ 0, %entry ]
%arrayidx = getelementptr [0 x double]* @A, i64 0, i64 %i.06
%tmp3 = load double* %arrayidx, align 8
%mul = fmul double %tmp3, 2.300000e+00
store double %mul, double* %arrayidx, align 8
%inc = add nsw i64 %i.06, 1
%exitcond = icmp eq i64 %inc, %n
br i1 %exitcond, label %for.end, label %for.body
for.end:
ret void
}