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ARM: Implement the rbit instruction.

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Gabe Black
2010-06-02 12:58:07 -05:00
parent 566b2ff20c
commit 5cc1bb6842
1 changed files with 20 additions and 0 deletions
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20
src/arch/arm/isa/insts/misc.isa
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@@ -154,6 +154,26 @@ let {{
decoder_output += RevOpConstructor.subst(revshIop)
exec_output += PredOpExecute.subst(revshIop)
rbitCode = '''
uint8_t *opBytes = (uint8_t *)&Op1;
uint32_t resTemp;
uint8_t *destBytes = (uint8_t *)&resTemp;
// This reverses the bytes and bits of the input, or so says the
// internet.
for (int i = 0; i < 4; i++) {
uint32_t temp = opBytes[i];
temp = (temp * 0x0802 & 0x22110) | (temp * 0x8020 & 0x88440);
destBytes[3 - i] = (temp * 0x10101) >> 16;
}
Dest = resTemp;
'''
rbitIop = InstObjParams("rbit", "Rbit", "RevOp",
{ "code": rbitCode,
"predicate_test": predicateTest }, [])
header_output += RevOpDeclare.subst(rbitIop)
decoder_output += RevOpConstructor.subst(rbitIop)
exec_output += PredOpExecute.subst(rbitIop)
ssatCode = '''
int32_t operand = shift_rm_imm(Op1, shiftAmt, shiftType, 0);
int32_t res;