[committed] Fix failure in gcc.target/sve/reduc_strict_3.c

[Richard Sandiford]

Unwanted unrolling meant that we had more single-precision FADDAs
than expected.

Tested on aarch64-linux-gnu (with and without SVE) and applied as r277442.

Richard


2019-10-25  Richard Sandiford  <richard.sandif...@arm.com>

gcc/testsuite/
        * gcc.target/aarch64/sve/reduc_strict_3.c (double_reduc1): Prevent
        the loop from being unrolled.

Index: gcc/testsuite/gcc.target/aarch64/sve/reduc_strict_3.c
===================================================================
--- gcc/testsuite/gcc.target/aarch64/sve/reduc_strict_3.c       2019-10-24 
08:29:08.000000000 +0100
+++ gcc/testsuite/gcc.target/aarch64/sve/reduc_strict_3.c       2019-10-25 
10:16:36.130802245 +0100
@@ -82,6 +82,7 @@ double_reduc1 (float (*restrict i)[16])
 {
   float l = 0;
 
+#pragma GCC unroll 0
   for (int a = 0; a < 8; a++)
     for (int b = 0; b < 8; b++)
       l += i[b][a];