[GCC 9 backport][AArch64] PR target/94518: Fix memmodel index in aarch64_store_exclusive_pair

[GCC 9 backport][AArch64] PR target/94518: Fix memmodel index in aarch64_store_exclusive_pair

[Kyrylo Tkachov]

[-- Attachment #1: Type: text/plain, Size: 433 bytes --]

Hi all,

A straight backport of

    [AArch64] Fix memmodel index in aarch64_store_exclusive_pair

    Found via an rtx checking failure.

    2019-09-23  Richard Sandiford  <richard.sandiford@arm.com>

    gcc/
            * config/aarch64/atomics.md (aarch64_store_exclusive_pair): Fix
            memmodel index.

Bootstrapped and tested on aarch64-none-linux-gnu.
Committing to the GCC 9 branch.
Thanks,
Kyrill

[-- Attachment #2: tmp.patch --]
[-- Type: application/octet-stream, Size: 970 bytes --]

commit 3a30d2558b3a199fe346479e6140cddae7fba5ed
Author: Richard Sandiford <richard.sandiford@arm.com>
Date:   Mon Sep 23 09:24:03 2019 +0000

    [AArch64] Fix memmodel index in aarch64_store_exclusive_pair
    
    Found via an rtx checking failure.
    
    2019-09-23  Richard Sandiford  <richard.sandiford@arm.com>
    
    gcc/
            * config/aarch64/atomics.md (aarch64_store_exclusive_pair): Fix
            memmodel index.
    
    From-SVN: r276052

diff --git a/gcc/config/aarch64/atomics.md b/gcc/config/aarch64/atomics.md
index 2e59b868420..411172119a2 100644
--- a/gcc/config/aarch64/atomics.md
+++ b/gcc/config/aarch64/atomics.md
@@ -752,7 +752,7 @@
 	  UNSPECV_SX))]
   ""
   {
-    enum memmodel model = memmodel_from_int (INTVAL (operands[3]));
+    enum memmodel model = memmodel_from_int (INTVAL (operands[4]));
     if (is_mm_relaxed (model) || is_mm_consume (model) || is_mm_acquire (model))
       return "stxp\t%w0, %x2, %x3, %1";
     else