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i386.c (x86_add_stmt_cost): Fix vector cost model for Silvermont.

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gcc/
        * config/i386/i386.c (x86_add_stmt_cost): Fix vector cost model for
        Silvermont.

From-SVN: r209466
This commit is contained in:
Evgeny Stupachenko 2014-04-17 07:47:37 +00:00 committed by Kirill Yukhin
parent a4ef7f3e57
commit 170c1776c4
2 changed files with 18 additions and 0 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2014-04-17 Evgeny Stupachenko <evstupac@gmail.com>
* config/i386/i386.c (x86_add_stmt_cost): Fix vector cost model for
Silvermont.
2014-04-17 Evgeny Stupachenko <evstupac@gmail.com>
* config/i386/x86-tune.def (TARGET_SLOW_PSHUFB): New tune definition.

13
gcc/config/i386/i386.c
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@ -81,6 +81,7 @@ along with GCC; see the file COPYING3. If not see
#include "context.h"
#include "pass_manager.h"
#include "target-globals.h"
#include "tree-vectorizer.h"
static rtx legitimize_dllimport_symbol (rtx, bool);
static rtx legitimize_pe_coff_extern_decl (rtx, bool);
@ -46329,6 +46330,18 @@ ix86_add_stmt_cost (void *data, int count, enum vect_cost_for_stmt kind,
count *= 50; /* FIXME. */
retval = (unsigned) (count * stmt_cost);
/* We need to multiply all vector stmt cost by 1.7 (estimated cost)
for Silvermont as it has out of order integer pipeline and can execute
2 scalar instruction per tick, but has in order SIMD pipeline. */
if (TARGET_SILVERMONT || TARGET_INTEL)
if (stmt_info && stmt_info->stmt)
{
tree lhs_op = gimple_get_lhs (stmt_info->stmt);
if (lhs_op && TREE_CODE (TREE_TYPE (lhs_op)) == INTEGER_TYPE)
retval = (retval * 17) / 10;
}
cost[where] += retval;
return retval;