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fix an x86-64 encoding bug Daniel found.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98855 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2010-03-18 20:04:36 +00:00
parent debbef20ee
commit 618d0ed4bc
2 changed files with 8 additions and 1 deletions
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5
lib/Target/X86/X86MCCodeEmitter.cpp
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@ -278,7 +278,10 @@ void X86MCCodeEmitter::EmitMemModRMByte(const MCInst &MI, unsigned Op,
// Emit the normal disp32 encoding.
EmitByte(ModRMByte(2, RegOpcodeField, 4), CurByte, OS);
ForceDisp32 = true;
} else if (Disp.getImm() == 0 && BaseReg != X86::EBP) {
} else if (Disp.getImm() == 0 &&
// Base reg can't be anything that ends up with '5' as the base
// reg, it is the magic [*] nomenclature that indicates no base.
BaseRegNo != N86::EBP) {
// Emit no displacement ModR/M byte
EmitByte(ModRMByte(0, RegOpcodeField, 4), CurByte, OS);
} else if (isDisp8(Disp.getImm())) {

4
test/MC/AsmParser/X86/x86_64-new-encoder.s
View File

@ -35,3 +35,7 @@ addq $-424, %rax
// CHECK: fixup A - offset: 3, value: _foo@GOTPCREL, kind: reloc_riprel_4byte_movq_load
movq _foo@GOTPCREL(%rip), %rax
// CHECK: movq (%r13,%rax,8), %r13
// CHECK: encoding: [0x4d,0x8b,0x6c,0xc5,0x00]
movq 0x00(%r13,%rax,8),%r13