From: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date: Mon, 20 Feb 2023 16:46:36 +0000 (-0300)
Subject: arm: Support gcc older than 10 for find_zero_all
X-Git-Tag: upstream/2.39~1089
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=97830304bb477f18b67b7bc11989fb3357da443e;p=platform%2Fupstream%2Fglibc.git

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 --git a/sysdeps/arm/armv6t2/string-fza.h b/sysdeps/arm/armv6t2/string-fza.h
index 76274cc..d85ce86 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.  */