[PATCH] x86: Disable tight loop alignment for m_CORE_ATOM

[Cui, Lili]

From: Lili Cui <lili....@intel.com>

Hi,

This patch is to disable tight loop alignment for m_CORE_ATOM.

Bootstrapped & regtested on x86-64-pc-linux-gnu.

Ok for trunk?

Thanks,
Lili.


For the E-core front end, aligning tight loops provides little benefit.

gcc/ChangeLog:

        * config/i386/x86-tune.def (X86_TUNE_ALIGN_TIGHT_LOOPS):
        disable tight loop alignment for m_CORE_ATOM.
---
 gcc/config/i386/x86-tune.def | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/gcc/config/i386/x86-tune.def b/gcc/config/i386/x86-tune.def
index 3298d9daed6..a1944620daf 100644
--- a/gcc/config/i386/x86-tune.def
+++ b/gcc/config/i386/x86-tune.def
@@ -253,7 +253,8 @@ DEF_TUNE (X86_TUNE_FOUR_JUMP_LIMIT, "four_jump_limit",
 
 /* X86_TUNE_ALIGN_TIGHT_LOOPS: if false, tight loops are not aligned. */
 DEF_TUNE (X86_TUNE_ALIGN_TIGHT_LOOPS, "align_tight_loops",
-        ~(m_ZHAOXIN | m_CASCADELAKE | m_SKYLAKE_AVX512))
+        ~(m_ZHAOXIN | m_CASCADELAKE | m_SKYLAKE_AVX512
+          | m_CORE_ATOM))
 
 /*****************************************************************************/
 /* Integer instruction selection tuning                                      */
-- 
2.34.1