| Message ID | 20230220164809.2581181-1-adhemerval.zanella@linaro.org |
|---|---|
| State | New |
| Headers | show |
| Series | arm: Support gcc older than 10 for find_zero_all | expand |
On 2/20/23 06:48, Adhemerval Zanella via Libc-alpha wrote: > __builtin_arm_uqsub8 is only available on gcc newer or equal than 10. > > Checked on arm-linux-gnueabihf built with gcc 9. > --- > sysdeps/arm/armv6t2/string-fza.h | 6 ++++++ > 1 file changed, 6 insertions(+) Whoops, thanks. Reviewed-by: Richard Henderson <richard.henderson@linaro.org> > > diff --git a/sysdeps/arm/armv6t2/string-fza.h b/sysdeps/arm/armv6t2/string-fza.h > index 76274ccca7..d85ce86434 100644 > --- a/sysdeps/arm/armv6t2/string-fza.h > +++ b/sysdeps/arm/armv6t2/string-fza.h > @@ -33,7 +33,13 @@ find_zero_all (op_t x) > /* Use unsigned saturated subtraction from 1 in each byte. > That leaves 1 for every byte that was zero. */ > op_t ones = repeat_bytes (0x01); > +#if __GNUC_PREREQ (10, 0) > return __builtin_arm_uqsub8 (ones, x); > +#else > + op_t ret; > + asm ("uqsub8 %0,%1,%2" : "=r"(ret) : "r"(ones), "r"(x)); > + return ret; > +#endif > } > > /* Identify bytes that are equal between X1 and X2. */
diff --git a/sysdeps/arm/armv6t2/string-fza.h b/sysdeps/arm/armv6t2/string-fza.h index 76274ccca7..d85ce86434 100644 --- a/sysdeps/arm/armv6t2/string-fza.h +++ b/sysdeps/arm/armv6t2/string-fza.h @@ -33,7 +33,13 @@ find_zero_all (op_t x) /* Use unsigned saturated subtraction from 1 in each byte. That leaves 1 for every byte that was zero. */ op_t ones = repeat_bytes (0x01); +#if __GNUC_PREREQ (10, 0) return __builtin_arm_uqsub8 (ones, x); +#else + op_t ret; + asm ("uqsub8 %0,%1,%2" : "=r"(ret) : "r"(ones), "r"(x)); + return ret; +#endif } /* Identify bytes that are equal between X1 and X2. */