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i386: Emit mfence_sse2 for -Os [PR95750]
authorUros Bizjak <ubizjak@gmail.com>
Fri, 24 Jul 2020 13:59:38 +0000 (15:59 +0200)
committerUros Bizjak <ubizjak@gmail.com>
Fri, 24 Jul 2020 14:00:39 +0000 (16:00 +0200)
2020-07-24  Uroš Bizjak  <ubizjak@gmail.com>

gcc/ChangeLog:
PR target/95750
* config/i386/sync.md (mmem_thread_fence): Emit mfence_sse2 for -Os.

gcc/config/i386/sync.md patch | blob | history

diff --git a/gcc/config/i386/sync.md b/gcc/config/i386/sync.md
index c88750d3664174e3ca3f10a6991bf9e867014896..ed17bb00205b45cdc9d4d215d595954774f66713 100644 (file)
--- a/gcc/config/i386/sync.md
+++ b/gcc/config/i386/sync.md
@@ -123,7 +123,8 @@
       rtx mem;
 
       if ((TARGET_64BIT || TARGET_SSE2)
-         && !TARGET_AVOID_MFENCE)
+         && (optimize_function_for_size_p (cfun)
+             || !TARGET_AVOID_MFENCE))
        mfence_insn = gen_mfence_sse2;
       else
        mfence_insn = gen_mfence_nosse;