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-rw-r--r--src/arch/arm/isa/insts/misc.isa20
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;