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From: Adhemerval Zanella <azanella@sourceware.org> To: glibc-cvs@sourceware.org Subject: [glibc] arm: Support gcc older than 10 for find_zero_all Date: Mon, 20 Feb 2023 19:44:15 +0000 (GMT) [thread overview] Message-ID: <20230220194415.40196384FB5C@sourceware.org> (raw) https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=97830304bb477f18b67b7bc11989fb3357da443e commit 97830304bb477f18b67b7bc11989fb3357da443e Author: Adhemerval Zanella <adhemerval.zanella@linaro.org> Date: Mon Feb 20 13:46:36 2023 -0300 arm: Support gcc older than 10 for find_zero_all __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> Diff: --- sysdeps/arm/armv6t2/string-fza.h | 6 ++++++ 1 file changed, 6 insertions(+) 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. */
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