i386-features.c (general_scalar_chain::convert_insn): Revert 2019-08-14 change.

	* config/i386/i386-features.c (general_scalar_chain::convert_insn)
	<case COMPARE>: Revert 2019-08-14 change.
	(convertible_comparison_p): Revert 2019-08-14 change.  Return false
	for (TARGET_64BIT || mode != DImode).

From-SVN: r274526

gcc/ChangeLog

+2019-08-15  Uroš Bizjak  <ubizjak@gmail.com>
+
+	* config/i386/i386-features.c (general_scalar_chain::convert_insn)
+	<case COMPARE>: Revert 2019-08-14 change.
+	(convertible_comparison_p): Revert 2019-08-14 change.  Return false
+	for (TARGET_64BIT || mode != DImode).
+
 2019-08-15  Aldy Hernandez  <aldyh@redhat.com>
 
 	* tree-vrp.c (value_range_base::set): Merge in code from
@@ -272,7 +279,7 @@
 	* config/i386/i386-expand.c (ix86_expand_vector_init_one_nonzero)
 	<case E_V8QImode>: Use vector_set path for
 	TARGET_MMX_WITH_SSE && TARGET_SSE4_1.
-	(ix86_expand_vector_init_one_nonzero) <case E_V8QImode>:
+	(ix86_expand_vector_init_one_var) <case E_V8QImode>:
 	Do not widen for TARGET_MMX_WITH_SSE && TARGET_SSE4_1.
 
 2019-08-14  Bernd Edlinger  <bernd.edlinger@hotmail.de>

gcc/config/i386/i386-features.c

@@ -1030,11 +1030,11 @@ general_scalar_chain::convert_insn (rtx_insn *insn)
     case COMPARE:
       src = SUBREG_REG (XEXP (XEXP (src, 0), 0));
 
-      gcc_assert ((REG_P (src) && GET_MODE (src) == GET_MODE_INNER (vmode))
-		  || (SUBREG_P (src) && GET_MODE (src) == vmode));
+      gcc_assert ((REG_P (src) && GET_MODE (src) == DImode)
+		  || (SUBREG_P (src) && GET_MODE (src) == V2DImode));
 
       if (REG_P (src))
-	subreg = gen_rtx_SUBREG (vmode, src, 0);
+	subreg = gen_rtx_SUBREG (V2DImode, src, 0);
       else
 	subreg = copy_rtx_if_shared (src);
       emit_insn_before (gen_vec_interleave_lowv2di (copy_rtx_if_shared (subreg),
@@ -1273,8 +1273,12 @@ has_non_address_hard_reg (rtx_insn *insn)
 		     (const_int 0 [0])))  */
 
 static bool
-convertible_comparison_p (rtx_insn *insn, enum machine_mode mode)
+convertible_comparison_p (rtx_insn *insn, machine_mode mode)
 {
+  /* ??? Currently convertible for double-word DImode chain only.  */
+  if (TARGET_64BIT || mode != DImode)
+    return false;
+
   if (!TARGET_SSE4_1)
     return false;
 
@@ -1306,12 +1310,12 @@ convertible_comparison_p (rtx_insn *insn, enum machine_mode mode)
 
   if (!SUBREG_P (op1)
       || !SUBREG_P (op2)
-      || GET_MODE (op1) != mode
-      || GET_MODE (op2) != mode
+      || GET_MODE (op1) != SImode
+      || GET_MODE (op2) != SImode
       || ((SUBREG_BYTE (op1) != 0
-	   || SUBREG_BYTE (op2) != GET_MODE_SIZE (mode))
+	   || SUBREG_BYTE (op2) != GET_MODE_SIZE (SImode))
 	  && (SUBREG_BYTE (op2) != 0
-	      || SUBREG_BYTE (op1) != GET_MODE_SIZE (mode))))
+	      || SUBREG_BYTE (op1) != GET_MODE_SIZE (SImode))))
     return false;
 
   op1 = SUBREG_REG (op1);
@@ -1319,13 +1323,13 @@ convertible_comparison_p (rtx_insn *insn, enum machine_mode mode)
 
   if (op1 != op2
       || !REG_P (op1)
-      || GET_MODE (op1) != GET_MODE_WIDER_MODE (mode).else_blk ())
+      || GET_MODE (op1) != DImode)
     return false;
 
   return true;
 }
 
-/* The DImode version of scalar_to_vector_candidate_p.  */
+/* The general version of scalar_to_vector_candidate_p.  */
 
 static bool
 general_scalar_to_vector_candidate_p (rtx_insn *insn, enum machine_mode mode)
@@ -1344,7 +1348,7 @@ general_scalar_to_vector_candidate_p (rtx_insn *insn, enum machine_mode mode)
   if (GET_CODE (src) == COMPARE)
     return convertible_comparison_p (insn, mode);
 
-  /* We are interested in DImode promotion only.  */
+  /* We are interested in "mode" only.  */
   if ((GET_MODE (src) != mode
        && !CONST_INT_P (src))
       || GET_MODE (dst) != mode)