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fix rdar://8735979 - "int 3" doesn't match to "int3". Unfortunately,

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InstAlias doesn't allow matching immediate operands, so we have to write
C++ code to do this.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129223 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2011-04-09 19:41:05 +00:00
parent 008c93e884
commit 15f8951799
3 changed files with 23 additions and 0 deletions
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12
lib/Target/X86/AsmParser/X86AsmParser.cpp
View File

@ -929,6 +929,18 @@ ParseInstruction(StringRef Name, SMLoc NameLoc,
}
}
// Transforms "int $3" into "int3" as a size optimization. We can't write an
// instalias with an immediate operand yet.
if (Name == "int" && Operands.size() == 2) {
X86Operand *Op1 = static_cast<X86Operand*>(Operands[1]);
if (Op1->isImm() && isa<MCConstantExpr>(Op1->getImm()) &&
cast<MCConstantExpr>(Op1->getImm())->getValue() == 3) {
delete Operands[1];
Operands.erase(Operands.begin() + 1);
static_cast<X86Operand*>(Operands[0])->setTokenValue("int3");
}
}
return false;
}

7
lib/Target/X86/X86InstrSystem.td
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@ -34,9 +34,16 @@ let Uses = [EFLAGS] in
def INTO : I<0xce, RawFrm, (outs), (ins), "into", []>;
def INT3 : I<0xcc, RawFrm, (outs), (ins), "int3",
[(int_x86_int (i8 3))]>;
// The long form of "int $3" turns into int3 as a size optimization.
// FIXME: This doesn't work because InstAlias can't match immediate constants.
//def : InstAlias<"int\t$3", (INT3)>;
def INT : Ii8<0xcd, RawFrm, (outs), (ins i8imm:$trap), "int\t$trap",
[(int_x86_int imm:$trap)]>;
def SYSCALL : I<0x05, RawFrm, (outs), (ins), "syscall", []>, TB;
def SYSRETL : I<0x07, RawFrm, (outs), (ins), "sysretl", []>, TB;
def SYSRETQ :RI<0x07, RawFrm, (outs), (ins), "sysretq", []>, TB,

4
test/MC/X86/x86-64.s
View File

@ -190,6 +190,10 @@ fadd %st(7)
// CHECK: int3
INT3
// rdar://8735979 - int $3 -> int3
// CHECK: int3
int $3
// Allow scale factor without index register.
// CHECK: movaps %xmm3, (%esi)