From 93b4080b3d02d47d9bd5e971b296430c5db567b1 Mon Sep 17 00:00:00 2001
From: Richard Henderson <rth@redhat.com>
Date: Wed, 29 Jun 2005 15:22:13 -0700
Subject: [PATCH] ia64.c (ia64_expand_vecint_minmax): Use us_minus and plus for
 V4HImode UMAX.

        * config/ia64/ia64.c (ia64_expand_vecint_minmax): Use us_minus and
        plus for V4HImode UMAX.

From-SVN: r101441
---
 gcc/ChangeLog          |  5 +++++
 gcc/config/ia64/ia64.c | 12 ++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 91e2631840e..ea8a5ae9d2f 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2005-06-29  Richard Henderson  <rth@redhat.com>
+
+	* config/ia64/ia64.c (ia64_expand_vecint_minmax): Use us_minus and
+	plus for V4HImode UMAX.
+
 2005-06-29  Joseph S. Myers  <joseph@codesourcery.com>
 
 	* c-tree.h (default_function_array_conversion): Take and return
diff --git a/gcc/config/ia64/ia64.c b/gcc/config/ia64/ia64.c
index 85d0bd22cd8..f8f34635827 100644
--- a/gcc/config/ia64/ia64.c
+++ b/gcc/config/ia64/ia64.c
@@ -1689,6 +1689,18 @@ ia64_expand_vecint_minmax (enum rtx_code code, enum machine_mode mode,
   if (mode == V4HImode && (code == SMIN || code == SMAX))
     return false;
 
+  /* This combination can be implemented with only saturating subtraction.  */
+  if (mode == V4HImode && code == UMAX)
+    {
+      rtx x, tmp = gen_reg_rtx (mode);
+
+      x = gen_rtx_US_MINUS (mode, operands[1], operands[2]);
+      emit_insn (gen_rtx_SET (VOIDmode, tmp, x));
+
+      emit_insn (gen_addv4hi3 (operands[0], tmp, operands[2]));
+      return true;
+    }
+
   /* Everything else implemented via vector comparisons.  */
   xops[0] = operands[0];
   xops[4] = xops[1] = operands[1];