rs6000-builtin.def (VSX_BUILTIN_VEC_LD, [...]): Add comment to explain non-traditional uses.

gcc/ChangeLog:

2018-06-06  Kelvin Nilsen  <kelvin@gcc.gnu.org>

	* config/rs6000/rs6000-builtin.def (VSX_BUILTIN_VEC_LD,
	VSX_BUILTIN_VEC_ST): Add comment to explain non-traditional uses.
	* config/rs6000/rs6000-c.c (altivec_overloaded_builtins): Remove
	several redundant entries.

From-SVN: r261234

gcc/ChangeLog

+2018-06-06  Kelvin Nilsen  <kelvin@gcc.gnu.org>
+
+	* config/rs6000/rs6000-builtin.def (VSX_BUILTIN_VEC_LD,
+	VSX_BUILTIN_VEC_ST): Add comment to explain non-traditional uses.
+	* config/rs6000/rs6000-c.c (altivec_overloaded_builtins): Remove
+	several redundant entries.
+
 2018-06-06  David Malcolm  <dmalcolm@redhat.com>
 
 	* config/i386/i386-protos.h (ix86_expand_call): Strengthen return

gcc/config/rs6000/rs6000-builtin.def

@@ -1811,6 +1811,15 @@ BU_VSX_OVERLOAD_1 (VUNSIGNEDE,  "vunsignede")
 BU_VSX_OVERLOAD_1 (VUNSIGNEDO,  "vunsignedo")
 
 /* VSX builtins that are handled as special cases.  */
+
+
+/* NON-TRADITIONAL BEHAVIOR HERE: Besides introducing the
+   __builtin_vec_ld and __builtin_vec_st built-in functions,
+   the VSX_BUILTIN_VEC_LD and VSX_BUILTIN_VEC_ST symbolic constants
+   introduced below are also affiliated with the __builtin_vec_vsx_ld
+   and __builtin_vec_vsx_st functions respectively.  This unnatural
+   binding is formed with explicit calls to the def_builtin function
+   found in rs6000.c.  */
 BU_VSX_OVERLOAD_X (LD,	     "ld")
 BU_VSX_OVERLOAD_X (ST,	     "st")
 BU_VSX_OVERLOAD_X (XL,	     "xl")

gcc/config/rs6000/rs6000-c.c

@@ -1375,26 +1375,14 @@ const struct altivec_builtin_types altivec_overloaded_builtins[] = {
     RS6000_BTI_bool_V4SI, RS6000_BTI_V4SF, RS6000_BTI_V4SF, 0 },
   { ALTIVEC_BUILTIN_VEC_VCMPGTSW, ALTIVEC_BUILTIN_VCMPGTSW,
     RS6000_BTI_bool_V4SI, RS6000_BTI_V4SI, RS6000_BTI_V4SI, 0 },
-  { ALTIVEC_BUILTIN_VEC_VCMPGTSW, ALTIVEC_BUILTIN_VCMPGTSW,
-    RS6000_BTI_bool_V4SI, RS6000_BTI_V4SI, RS6000_BTI_V4SI, 0 },
-  { ALTIVEC_BUILTIN_VEC_VCMPGTUW, ALTIVEC_BUILTIN_VCMPGTUW,
-    RS6000_BTI_bool_V4SI, RS6000_BTI_unsigned_V4SI, RS6000_BTI_unsigned_V4SI, 0 },
   { ALTIVEC_BUILTIN_VEC_VCMPGTUW, ALTIVEC_BUILTIN_VCMPGTUW,
     RS6000_BTI_bool_V4SI, RS6000_BTI_unsigned_V4SI, RS6000_BTI_unsigned_V4SI, 0 },
   { ALTIVEC_BUILTIN_VEC_VCMPGTSH, ALTIVEC_BUILTIN_VCMPGTSH,
     RS6000_BTI_bool_V8HI, RS6000_BTI_V8HI, RS6000_BTI_V8HI, 0 },
-  { ALTIVEC_BUILTIN_VEC_VCMPGTSH, ALTIVEC_BUILTIN_VCMPGTSH,
-    RS6000_BTI_bool_V8HI, RS6000_BTI_V8HI, RS6000_BTI_V8HI, 0 },
-  { ALTIVEC_BUILTIN_VEC_VCMPGTUH, ALTIVEC_BUILTIN_VCMPGTUH,
-    RS6000_BTI_bool_V8HI, RS6000_BTI_unsigned_V8HI, RS6000_BTI_unsigned_V8HI, 0 },
   { ALTIVEC_BUILTIN_VEC_VCMPGTUH, ALTIVEC_BUILTIN_VCMPGTUH,
     RS6000_BTI_bool_V8HI, RS6000_BTI_unsigned_V8HI, RS6000_BTI_unsigned_V8HI, 0 },
   { ALTIVEC_BUILTIN_VEC_VCMPGTSB, ALTIVEC_BUILTIN_VCMPGTSB,
     RS6000_BTI_bool_V16QI, RS6000_BTI_V16QI, RS6000_BTI_V16QI, 0 },
-  { ALTIVEC_BUILTIN_VEC_VCMPGTSB, ALTIVEC_BUILTIN_VCMPGTSB,
-    RS6000_BTI_bool_V16QI, RS6000_BTI_V16QI, RS6000_BTI_V16QI, 0 },
-  { ALTIVEC_BUILTIN_VEC_VCMPGTUB, ALTIVEC_BUILTIN_VCMPGTUB,
-    RS6000_BTI_bool_V16QI, RS6000_BTI_unsigned_V16QI, RS6000_BTI_unsigned_V16QI, 0 },
   { ALTIVEC_BUILTIN_VEC_VCMPGTUB, ALTIVEC_BUILTIN_VCMPGTUB,
     RS6000_BTI_bool_V16QI, RS6000_BTI_unsigned_V16QI, RS6000_BTI_unsigned_V16QI, 0 },
   { ALTIVEC_BUILTIN_VEC_CMPLE, ALTIVEC_BUILTIN_VCMPGEFP,
@@ -4249,8 +4237,6 @@ const struct altivec_builtin_types altivec_overloaded_builtins[] = {
   { VSX_BUILTIN_VEC_LD, VSX_BUILTIN_LXVD2X_V2DI,
     RS6000_BTI_V2DI, RS6000_BTI_INTSI, ~RS6000_BTI_long_long, 0 },
   { VSX_BUILTIN_VEC_LD, VSX_BUILTIN_LXVD2X_V2DI,
-    RS6000_BTI_V2DI, RS6000_BTI_INTSI, ~RS6000_BTI_long_long, 0 },
-  { VSX_BUILTIN_VEC_LD, VSX_BUILTIN_LXVD2X_V2DI,
     RS6000_BTI_unsigned_V1TI, RS6000_BTI_INTSI, ~RS6000_BTI_UINTTI, 0 },
   { VSX_BUILTIN_VEC_LD, VSX_BUILTIN_LXVD2X_V2DI,
     RS6000_BTI_unsigned_V2DI, RS6000_BTI_INTSI,
@@ -5620,8 +5606,6 @@ const struct altivec_builtin_types altivec_overloaded_builtins[] = {
   { P8V_BUILTIN_VEC_VMRGOW, P8V_BUILTIN_VMRGOW_V2DI,
     RS6000_BTI_V2DI, RS6000_BTI_V2DI, RS6000_BTI_V2DI, 0 },
   { P8V_BUILTIN_VEC_VMRGOW, P8V_BUILTIN_VMRGOW_V2DI,
-    RS6000_BTI_V2DI, RS6000_BTI_V2DI, RS6000_BTI_V2DI, 0 },
-  { P8V_BUILTIN_VEC_VMRGOW, P8V_BUILTIN_VMRGOW_V2DI,
     RS6000_BTI_unsigned_V2DI, RS6000_BTI_unsigned_V2DI,
     RS6000_BTI_unsigned_V2DI, 0 },
   { P8V_BUILTIN_VEC_VMRGOW, P8V_BUILTIN_VMRGOW_V2DI,