expr.c (store_constructor): Use store of 0 to indicate value death instead of a clobber.

        * expr.c (store_constructor): Use store of 0 to indicate value
        death instead of a clobber.

        * config/i386/i386.c (ix86_expand_reduc_v4sf): New.
        * config/i386/i386-protos.h (ix86_expand_reduc_v4sf): Declare.
        * config/i386/sse.md (reduc_plus_v4sf): New.
        (reduc_smax_v4sf, reduc_smin_v4sf): New.

From-SVN: r101169

gcc/ChangeLog

+2005-06-18  Richard Henderson  <rth@redhat.com>
+
+	* expr.c (store_constructor): Use store of 0 to indicate value
+	death instead of a clobber.
+
+	* config/i386/i386.c (ix86_expand_reduc_v4sf): New.
+	* config/i386/i386-protos.h (ix86_expand_reduc_v4sf): Declare.
+	* config/i386/sse.md (reduc_plus_v4sf): New.
+	(reduc_smax_v4sf, reduc_smin_v4sf): New.
+
 2005-06-18  James A. Morrison  <phython@gcc.gnu.org>
 
 	* fold_const (fold_binary): Fold X % (2**N) to X & (2**N - 1) for

gcc/config/i386/i386-protos.h

@@ -230,6 +230,7 @@ extern rtx ix86_tls_get_addr (void);
 extern void ix86_expand_vector_init (bool, rtx, rtx);
 extern void ix86_expand_vector_set (bool, rtx, rtx, int);
 extern void ix86_expand_vector_extract (bool, rtx, rtx, int);
+extern void ix86_expand_reduc_v4sf (rtx (*)(rtx, rtx, rtx), rtx, rtx);
 
 /* In winnt.c  */
 extern int i386_pe_dllexport_name_p (const char *);

gcc/config/i386/i386.c

@@ -17366,6 +17366,27 @@ ix86_expand_vector_extract (bool mmx_ok, rtx target, rtx vec, int elt)
       emit_move_insn (target, tmp);
     }
 }
+
+/* Expand a vector reduction on V4SFmode for SSE1.  FN is the binar
+   pattern to reduce; DEST is the destination; IN is the input vector.  */
+
+void
+ix86_expand_reduc_v4sf (rtx (*fn) (rtx, rtx, rtx), rtx dest, rtx in)
+{
+  rtx tmp1, tmp2, tmp3;
+
+  tmp1 = gen_reg_rtx (V4SFmode);
+  tmp2 = gen_reg_rtx (V4SFmode);
+  tmp3 = gen_reg_rtx (V4SFmode);
+
+  emit_insn (gen_sse_movhlps (tmp1, in, in));
+  emit_insn (fn (tmp2, tmp1, in));
+
+  emit_insn (gen_sse_shufps_1 (tmp3, tmp2, tmp2,
+			       GEN_INT (1), GEN_INT (1),
+			       GEN_INT (1+4), GEN_INT (1+4)));
+  emit_insn (fn (dest, tmp2, tmp3));
+}
 
 /* Implements target hook vector_mode_supported_p.  */
 static bool

gcc/config/i386/sse.md

@@ -653,6 +653,40 @@
   [(set_attr "type" "sseadd")
    (set_attr "mode" "V4SF")])
 
+(define_expand "reduc_plus_v4sf"
+  [(match_operand:V4SF 0 "register_operand" "")
+   (match_operand:V4SF 1 "register_operand" "")]
+  "TARGET_SSE"
+{
+  if (TARGET_SSE3)
+    {
+      rtx tmp = gen_reg_rtx (V4SFmode);
+      emit_insn (gen_sse3_haddv4sf3 (tmp, operands[1], operands[1]));
+      emit_insn (gen_sse3_haddv4sf3 (operands[0], tmp, tmp));
+    }
+  else
+    ix86_expand_reduc_v4sf (gen_addv4sf3, operands[0], operands[1]);
+  DONE;
+})
+
+(define_expand "reduc_smax_v4sf"
+  [(match_operand:V4SF 0 "register_operand" "")
+   (match_operand:V4SF 1 "register_operand" "")]
+  "TARGET_SSE"
+{
+  ix86_expand_reduc_v4sf (gen_smaxv4sf3, operands[0], operands[1]);
+  DONE;
+})
+
+(define_expand "reduc_smin_v4sf"
+  [(match_operand:V4SF 0 "register_operand" "")
+   (match_operand:V4SF 1 "register_operand" "")]
+  "TARGET_SSE"
+{
+  ix86_expand_reduc_v4sf (gen_sminv4sf3, operands[0], operands[1]);
+  DONE;
+})
+
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;;
 ;; Parallel single-precision floating point comparisons

gcc/expr.c

@@ -5151,9 +5151,9 @@ store_constructor (tree exp, rtx target, int cleared, HOST_WIDE_INT size)
 	    cleared = 1;
 	  }
 	
+	/* Inform later passes that the old value is dead.  */
 	if (!cleared && REG_P (target))
-	  /* Inform later passes that the old value is dead.  */
-	  emit_insn (gen_rtx_CLOBBER (VOIDmode, target));
+	  emit_move_insn (target, CONST0_RTX (GET_MODE (target)));
 
         /* Store each element of the constructor into the corresponding
 	   element of TARGET, determined by counting the elements.  */