PR target/53358

	* config/i386/i386.md (*addqi_2 peephole with QImode addition): Check
	that operands[2] is either immediate, or q_regs_operand.

	* gcc.dg/pr53358.c: New test.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@187544 138bc75d-0d04-0410-961f-82ee72b054a4

gcc/ChangeLog

@@ -1,3 +1,9 @@
+2012-05-15  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/53358
+	* config/i386/i386.md (*addqi_2 peephole with QImode addition): Check
+	that operands[2] is either immediate, or q_regs_operand.
+
 2012-05-15  Richard Guenther  <rguenther@suse.de>
 
 	* cgraphunit.c (thunk_adjust): Use make_rename_temp.

gcc/config/i386/i386.md

@@ -17465,6 +17465,9 @@
   "(TARGET_READ_MODIFY_WRITE || optimize_insn_for_size_p ())
    && peep2_reg_dead_p (4, operands[0])
    && !reg_overlap_mentioned_p (operands[0], operands[1])
+   && (<MODE>mode != QImode
+       || immediate_operand (operands[2], QImode)
+       || q_regs_operand (operands[2], QImode))
    && ix86_match_ccmode (peep2_next_insn (3),
 			 (GET_CODE (operands[3]) == PLUS
 			  || GET_CODE (operands[3]) == MINUS)

gcc/testsuite/ChangeLog

@@ -1,3 +1,8 @@
+2012-05-15  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/53358
+	* gcc.dg/pr53358.c: New test.
+
 2012-05-15  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR c++/11856

gcc/testsuite/gcc.dg/pr53358.c

@@ -0,0 +1,22 @@
+/* PR target/53358 */
+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+/* { dg-additional-options "-fpic" { target fpic } } */
+/* { dg-additional-options "-mtune=pentium4" { target { { i?86-*-* x86_64-*-* } && ia32 } } } */
+
+struct S { unsigned char s, t[17]; };
+int bar (void);
+
+void
+foo (struct S *x)
+{
+  unsigned char i, z;
+  if (bar ())
+    {
+      z = bar ();
+      bar ();
+      x->s += z;
+      for (i = 0; i < x->s; i++)
+	x->t[i] = bar ();
+    }
+}