Lines Matching refs:AH
2273 SrcReg = LoReg = X86::AL; HiReg = X86::AH;
2343 // Prevent use of AH in a REX instruction by referencing AX instead.
2344 if (HiReg == X86::AH && Subtarget->is64Bit() &&
2418 LoReg = X86::AL; ClrReg = HiReg = X86::AH;
2443 // clear the upper 8 bits (AH).
2510 // Prevent use of AH in a REX instruction by referencing AX instead.
2517 if (HiReg == X86::AH && Subtarget->is64Bit() &&
2530 // Shift AX right by 8 bits instead of using AH.
2614 // For example, "testl %eax, $2048" to "testb %ah, $8".
