PR target/22585

	* config/i386/i386.c (ix86_prepare_fp_compare_args): Do not
	force integer op1 into register for XFmode compares.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@104498 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 415fd5c..58b8a36 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2005-09-21  Uros Bizjak  <uros@kss-loka.si>
+
+       PR target/22585
+       * config/i386/i386.c (ix86_prepare_fp_compare_args): Do not
+       force integer op1 into register for XFmode compares.
+
 2005-09-21  Kazu Hirata  <kazu@codesourcery.com>
 
        PR middle-end/23971

diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index a53df0b..914e66e 100644 (file)
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -9065,15 +9065,17 @@ ix86_prepare_fp_compare_args (enum rtx_code code, rtx *pop0, rtx *pop1)
   int is_sse = TARGET_SSE_MATH && SSE_FLOAT_MODE_P (op_mode);
 
   /* All of the unordered compare instructions only work on registers.
-     The same is true of the fcomi compare instructions.  The same is
-     true of the XFmode compare instructions if not comparing with
-     zero (ftst insn is used in this case).  */
+     The same is true of the fcomi compare instructions.  The XFmode
+     compare instructions require registers except when comparing
+     against zero or when converting operand 1 from fixed point to
+     floating point.  */
 
   if (!is_sse
       && (fpcmp_mode == CCFPUmode
          || (op_mode == XFmode
              && ! (standard_80387_constant_p (op0) == 1
-                   || standard_80387_constant_p (op1) == 1))
+                   || standard_80387_constant_p (op1) == 1)
+             && GET_CODE (op1) != FLOAT)
          || ix86_use_fcomi_compare (code)))
     {
       op0 = force_reg (op_mode, op0);