i386.md: Check cmp/branch fuse for cmp peephole optimization.

2008-09-25  H.J. Lu  <hongjiu.lu@intel.com>

	* config/i386/i386.md: Check cmp/branch fuse for cmp peephole
	optimization.

From-SVN: r140673

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 0515819..aa42f0b 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2008-09-25  H.J. Lu  <hongjiu.lu@intel.com>
+
+       * config/i386/i386.md: Check cmp/branch fuse for cmp peephole
+       optimization.
+
 2008-09-25  Richard Sandiford  <rdsandiford@googlemail.com>
 
        * combine.c (make_compound_operation): Handle the 'E' format.
@@ -11,7 +16,7 @@
 
 2008-09-25 Sergei Dyshel <sergeid@il.ibm.com>
 
-      * matrix-reorg.c (transform_allocation_sites): Initializers 
+       * matrix-reorg.c (transform_allocation_sites): Initializers 
        added to avoid the warning.
 
 2008-09-25  Martin Jambor  <mjambor@suse.cz>

diff --git a/gcc/config/i386/i386.md b/gcc/config/i386/i386.md
index de58df3..c6fba67 100644 (file)
--- a/gcc/config/i386/i386.md
+++ b/gcc/config/i386/i386.md
@@ -20966,15 +20966,16 @@
   "")
 \f
 ;; Convert compares with 1 to shorter inc/dec operations when CF is not
-;; required and register dies.  Similarly for 128 to plus -128.
+;; required and register dies.  Similarly for 128 to -128.
 (define_peephole2
   [(set (match_operand 0 "flags_reg_operand" "")
        (match_operator 1 "compare_operator"
          [(match_operand 2 "register_operand" "")
           (match_operand 3 "const_int_operand" "")]))]
-  "(INTVAL (operands[3]) == -1
-    || INTVAL (operands[3]) == 1
-    || INTVAL (operands[3]) == 128)
+  "(((!TARGET_FUSE_CMP_AND_BRANCH || optimize_size)
+     && incdec_operand (operands[3], GET_MODE (operands[3])))
+    || (!TARGET_FUSE_CMP_AND_BRANCH
+       && INTVAL (operands[3]) == 128))
    && ix86_match_ccmode (insn, CCGCmode)
    && peep2_reg_dead_p (1, operands[2])"
   [(parallel [(set (match_dup 0)