diff options
| author | Noah Goldstein <goldstein.w.n@gmail.com> | 2022-10-19 19:13:38 -0700 |
|---|---|---|
| committer | Noah Goldstein <goldstein.w.n@gmail.com> | 2022-10-20 11:29:05 -0700 |
| commit | 8775479804cfea2bbe4dcdf19d6589264c96d5fb (patch) | |
| tree | 30638b90a3c7ba416a9f5cc868eaf8040b5037fc | |
| parent | f04f8373ddd71794050b904174fb06967be6393f (diff) | |
| download | glibc-8775479804cfea2bbe4dcdf19d6589264c96d5fb.tar.gz glibc-8775479804cfea2bbe4dcdf19d6589264c96d5fb.tar.xz glibc-8775479804cfea2bbe4dcdf19d6589264c96d5fb.zip | |
x86: Use `testb` for FSRM check in memmove-vec-unaligned-erms
`testb` saves a bit of code size is the imm-operand can be encoded 1-bytes. Tested on x86-64.
| -rw-r--r-- | sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S b/sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S index 5b758cae5e..f6d7f3e88b 100644 --- a/sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S +++ b/sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S @@ -616,7 +616,11 @@ L(movsb): jae L(large_memcpy_2x_check) # if AVOID_SHORT_DISTANCE_REP_MOVSB || ALIGN_MOVSB /* Only avoid short movsb if CPU has FSRM. */ +# if X86_STRING_CONTROL_AVOID_SHORT_DISTANCE_REP_MOVSB < 256 + testb $X86_STRING_CONTROL_AVOID_SHORT_DISTANCE_REP_MOVSB, __x86_string_control(%rip) +# else testl $X86_STRING_CONTROL_AVOID_SHORT_DISTANCE_REP_MOVSB, __x86_string_control(%rip) +# endif jz L(skip_short_movsb_check) # if AVOID_SHORT_DISTANCE_REP_MOVSB /* Avoid "rep movsb" if RCX, the distance between source and |