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arm: Support gcc older than 10 for find_zero_all

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__builtin_arm_uqsub8 is only available on gcc newer or equal than 10.

Checked on arm-linux-gnueabihf built with gcc 9.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Adhemerval Zanella 2023-02-20 13:46:36 -03:00
parent 3f98a5c027
commit 97830304bb
1 changed files with 6 additions and 0 deletions
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6
sysdeps/arm/armv6t2/string-fza.h
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@ -33,7 +33,13 @@ find_zero_all (op_t x)
/* Use unsigned saturated subtraction from 1 in each byte. /* Use unsigned saturated subtraction from 1 in each byte.
That leaves 1 for every byte that was zero. */ That leaves 1 for every byte that was zero. */
op_t ones = repeat_bytes (0x01); op_t ones = repeat_bytes (0x01);
#if __GNUC_PREREQ (10, 0)
return __builtin_arm_uqsub8 (ones, x); 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. */ /* Identify bytes that are equal between X1 and X2. */