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Handle a displacement location in 64-bit as an RIP-relative displacement. It

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fixes a bug (<rdar://problem/7880900>) in the JIT. This code wouldn't work:

target triple = "x86_64-apple-darwin"

define double @func(double %a) {
  %tmp1 = fmul double %a, 5.000000e-01            ; <double> [#uses=1]
  ret double %tmp1
}

define i32 @main() nounwind {
  %1 = call double @func(double 4.770000e-04) ; <i64> [#uses=0]
  ret i32 0
}


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101965 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling
2010-04-21 00:34:04 +00:00
parent 3115698611
commit a040fffefb
1 changed files with 11 additions and 1 deletions
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12
lib/Target/X86/X86CodeEmitter.cpp
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@@ -380,6 +380,16 @@ void Emitter<CodeEmitter>::emitMemModRMByte(const MachineInstr &MI,
const MachineOperand &IndexReg = MI.getOperand(Op+2);
unsigned BaseReg = Base.getReg();
// Handle %rip relative addressing.
if (BaseReg == X86::RIP ||
(Is64BitMode && DispForReloc)) { // [disp32+RIP] in X86-64 mode
assert(IndexReg.getReg() == 0 && Is64BitMode &&
"Invalid rip-relative address");
MCE.emitByte(ModRMByte(0, RegOpcodeField, 5));
emitDisplacementField(DispForReloc, DispVal, PCAdj, true);
return;
}
// Indicate that the displacement will use an pcrel or absolute reference
// by default. MCEs able to resolve addresses on-the-fly use pcrel by default
@@ -447,7 +457,7 @@ void Emitter<CodeEmitter>::emitMemModRMByte(const MachineInstr &MI,
// Emit the normal disp32 encoding.
MCE.emitByte(ModRMByte(2, RegOpcodeField, 4));
ForceDisp32 = true;
} else if (DispVal == 0 && getX86RegNum(BaseReg) != N86::EBP) {
} else if (DispVal == 0 && BaseRegNo != N86::EBP) {
// Emit no displacement ModR/M byte
MCE.emitByte(ModRMByte(0, RegOpcodeField, 4));
} else if (isDisp8(DispVal)) {