diff options
-rw-r--r-- | src/arch/arm/isa/insts/misc.isa | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/src/arch/arm/isa/insts/misc.isa b/src/arch/arm/isa/insts/misc.isa index 652a15b3b..09d27360e 100644 --- a/src/arch/arm/isa/insts/misc.isa +++ b/src/arch/arm/isa/insts/misc.isa @@ -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; |