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[PATCH, x86-Atom] Enabling look-ahead scheduling feature for Atom processors


Following change enables look ahead feature in the code scheduler for
Atom processors. This gives quite reasonable gain for some benchmarks
for mobile market.

Overall compile time increase for SPEC2000 is about 1%.

Regtested for x86_64 and also bootstrapped with "--with-arch=core2
Ok for trunk?



2012-08-23  Yuri Rumyantsev  <>

	* config/i386/i386.c (ia32_multipass_dfa_lookahead) : Add
	case for Atom processor.

diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index 976bbb4..331e29a 100644
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -24103,6 +24103,7 @@ ia32_multipass_dfa_lookahead (void)
     case PROCESSOR_CORE2_64:
     case PROCESSOR_COREI7_32:
     case PROCESSOR_COREI7_64:
       /* Generally, we want haifa-sched:max_issue() to look ahead as far
         as many instructions can be executed on a cycle, i.e.,
         issue_rate.  I wonder why tuning for many CPUs does not do this.  */

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