From: Adhemerval Zanella Netto <adhemerval.zanella@linaro.org>
Date: Tue, 28 Feb 2023 18:23:25 +0000 (-0300)
Subject: arm: Remove __builtin_arm_uqsub8 usage on string-fza.h
X-Git-Tag: glibc-2.38~503
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3a4781c16c680a2c5ab4585b4696f781898ab610;p=thirdparty%2Fglibc.git

arm: Remove __builtin_arm_uqsub8 usage on string-fza.h

The __builtin_arm_uqsub8 is an internal GCC builtin which might change
in future release (the correct way is to include "arm_acle.h" and use
__uqsub8 ()).  Since not all compilers support it, just use the
inline assembler instead.

Checked on armv7a-linux-gnueabihf.
Reviewed-by: Wilco Dijkstra  <Wilco.Dijkstra@arm.com>
---

diff --git a/sysdeps/arm/armv6t2/string-fza.h b/sysdeps/arm/armv6t2/string-fza.h
index d85ce86434b..fb750119911 100644
--- a/sysdeps/arm/armv6t2/string-fza.h
+++ b/sysdeps/arm/armv6t2/string-fza.h
@@ -33,13 +33,9 @@ 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.  */