Lines Matching refs:AH
2295 SrcReg = LoReg = X86::AL; HiReg = X86::AH;
2365 // Prevent use of AH in a REX instruction by referencing AX instead.
2366 if (HiReg == X86::AH && Subtarget->is64Bit() &&
2440 LoReg = X86::AL; ClrReg = HiReg = X86::AH;
2465 // clear the upper 8 bits (AH).
2532 // Prevent use of AH in a REX instruction by referencing AX instead.
2539 if (HiReg == X86::AH && Subtarget->is64Bit() &&
2552 // Shift AX right by 8 bits instead of using AH.
2636 // For example, "testl %eax, $2048" to "testb %ah, $8".
