From: Adhemerval Zanella <adhemerval.zanella@linaro.org>
To: libc-alpha@sourceware.org, Szabolcs Nagy <szabolcs.nagy@arm.com>
Subject: [PATCH] arm: Support gcc older than 10 for find_zero_all
Date: Mon, 20 Feb 2023 13:48:09 -0300 [thread overview]
Message-ID: <20230220164809.2581181-1-adhemerval.zanella@linaro.org> (raw)
__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(+)
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. */
--
2.34.1
next reply other threads:[~2023-02-20 16:48 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-20 16:48 Adhemerval Zanella [this message]
2023-02-20 19:26 ` Richard Henderson
2023-02-22 16:37 Wilco Dijkstra
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