PR target/43546

	* expr.c (compress_float_constant): If x is a hard register,
	extend into a pseudo and then move to x.

	* gcc.target/i386/pr43546.c: New test.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@207757 138bc75d-0d04-0410-961f-82ee72b054a4

4 files changed, 34 insertions, 2 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index e0293c5096f..d159346e723 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2014-02-13  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/43546
+	* expr.c (compress_float_constant): If x is a hard register,
+	extend into a pseudo and then move to x.
+
 2014-02-13  Dominik Vogt  <vogt@linux.vnet.ibm.com>
 
 	* config/s390/s390.c (s390_asm_output_function_label): Fix crash
diff --git a/gcc/expr.c b/gcc/expr.c
index f6708da20d9..29ce694704c 100644
--- a/gcc/expr.c
+++ b/gcc/expr.c
@@ -3726,12 +3726,21 @@ compress_float_constant (rtx x, rtx y)
 	 into a new pseudo.  This constant may be used in different modes,
 	 and if not, combine will put things back together for us.  */
       trunc_y = force_reg (srcmode, trunc_y);
-      emit_unop_insn (ic, x, trunc_y, UNKNOWN);
+
+      /* If x is a hard register, perform the extension into a pseudo,
+	 so that e.g. stack realignment code is aware of it.  */
+      rtx target = x;
+      if (REG_P (x) && HARD_REGISTER_P (x))
+	target = gen_reg_rtx (dstmode);
+
+      emit_unop_insn (ic, target, trunc_y, UNKNOWN);
       last_insn = get_last_insn ();
 
-      if (REG_P (x))
+      if (REG_P (target))
 	set_unique_reg_note (last_insn, REG_EQUAL, y);
 
+      if (target != x)
+	return emit_move_insn (x, target);
       return last_insn;
     }
 
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 392986f4f8f..881aa3df2a0 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2014-02-13  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/43546
+	* gcc.target/i386/pr43546.c: New test.
+
 2014-02-13  Dominik Vogt  <vogt@linux.vnet.ibm.com>
 
 	* gcc.target/s390/hotpatch-compile-8.c: New test.
diff --git a/gcc/testsuite/gcc.target/i386/pr43546.c b/gcc/testsuite/gcc.target/i386/pr43546.c
new file mode 100644
index 00000000000..53cb3a07fdf
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr43546.c
@@ -0,0 +1,12 @@
+/* PR target/43546 */
+/* { dg-do compile } */
+/* { dg-options "-O1" } */
+/* { dg-additional-options "-mpreferred-stack-boundary=2 -msseregparm -msse" { target ia32 } } */
+
+extern void bar (double);
+
+void
+foo (void)
+{
+  bar (1.0);
+}