From: jakub <jakub@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Sun, 9 Jun 2013 18:30:01 +0000 (+0000)
Subject: 	PR target/57568
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=1bb66e410b45fefedd01ed3c63956e1d4c5fdf48;p=thirdparty%2Fgcc.git

	PR target/57568
	* config/i386/i386.md (TARGET_READ_MODIFY_WRITE peepholes): Ensure
	that operands[2] doesn't overlap with operands[0].

	* gcc.c-torture/execute/pr57568.c: New test.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@199870 138bc75d-0d04-0410-961f-82ee72b054a4
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 30f667a0ce1e..2767fbb6904e 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2013-06-09  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/57568
+	* config/i386/i386.md (TARGET_READ_MODIFY_WRITE peepholes): Ensure
+	that operands[2] doesn't overlap with operands[0].
+
 2013-06-09  David Edelsohn  <dje.gcc@gmail.com>
 	    Jan Hubicka  <jh@suse.cz>
 
diff --git a/gcc/config/i386/i386.md b/gcc/config/i386/i386.md
index 018678dc8502..e97a4570501c 100644
--- a/gcc/config/i386/i386.md
+++ b/gcc/config/i386/i386.md
@@ -16591,6 +16591,7 @@
   "(TARGET_READ_MODIFY_WRITE || optimize_insn_for_size_p ())
    && peep2_reg_dead_p (4, operands[0])
    && !reg_overlap_mentioned_p (operands[0], operands[1])
+   && !reg_overlap_mentioned_p (operands[0], operands[2])
    && (<MODE>mode != QImode
        || immediate_operand (operands[2], QImode)
        || q_regs_operand (operands[2], QImode))
@@ -16655,6 +16656,7 @@
        || immediate_operand (operands[2], SImode)
        || q_regs_operand (operands[2], SImode))
    && !reg_overlap_mentioned_p (operands[0], operands[1])
+   && !reg_overlap_mentioned_p (operands[0], operands[2])
    && ix86_match_ccmode (peep2_next_insn (3),
 			 (GET_CODE (operands[3]) == PLUS
 			  || GET_CODE (operands[3]) == MINUS)
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 0628bfa798bd..0ba3af62182a 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2013-06-09  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/57568
+	* gcc.c-torture/execute/pr57568.c: New test.
+
 2013-06-09  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR c++/37404
diff --git a/gcc/testsuite/gcc.c-torture/execute/pr57568.c b/gcc/testsuite/gcc.c-torture/execute/pr57568.c
new file mode 100644
index 000000000000..9a7ddb0c56fd
--- /dev/null
+++ b/gcc/testsuite/gcc.c-torture/execute/pr57568.c
@@ -0,0 +1,12 @@
+/* PR target/57568 */
+
+extern void abort (void);
+int a[6][9] = { }, b = 1, *c = &a[3][5];
+
+int
+main ()
+{
+  if (b && (*c = *c + *c))
+    abort ();
+  return 0;
+}