[RS6000] Ignore "c", "l" and "h" for register preference

This catches a few places where move insn patterns don't slightly
disparage CTR, LR and VRSAVE regs.  Also fixes the doc for the rs6000
h constraint, and removes an r->cl alternative covered by r->h.

	* gcc/doc/md.texi (Machine Constraints): Correct rs6000 h constraint
	description.
	* config/rs6000/rs6000.md (movsi_internal1): Delete MT%0 case
	covered by alternative.
	(movcc_internal1): Ignore h for register preference.
	(mov<mode>_hardfloat64): Likewise.
	(mov<mode>_softfloat): Ignore c, l, h for register preference.

From-SVN: r266044

gcc/ChangeLog

+2018-11-13  Alan Modra  <amodra@gmail.com>
+
+	* gcc/doc/md.texi (Machine Constraints): Correct rs6000 h constraint
+	description.
+	* config/rs6000/rs6000.md (movsi_internal1): Delete MT%0 case
+	covered by alternative.
+	(movcc_internal1): Ignore h for register preference.
+	(mov<mode>_hardfloat64): Likewise.
+	(mov<mode>_softfloat): Ignore c, l, h for register preference.
+
 2018-11-12  Sandra Loosemore  <sandra@codesourcery.com>
 
 	PR preprocessor/47823

gcc/config/rs6000/rs6000.md

@@ -6839,21 +6839,21 @@
 ;;		STW          STFIWX       STXSIWX      LI           LIS
 ;;		#            XXLOR        XXSPLTIB 0   XXSPLTIB -1  VSPLTISW
 ;;		XXLXOR 0     XXLORC -1    P9 const     MTVSRWZ      MFVSRWZ
-;;		MF%1         MT%0         MT%0         NOP
+;;		MF%1         MT%0         NOP
 (define_insn "*movsi_internal1"
   [(set (match_operand:SI 0 "nonimmediate_operand"
 		"=r,         r,           r,           ?*wI,        ?*wH,
 		 m,          ?Z,          ?Z,          r,           r,
 		 r,          ?*wIwH,      ?*wJwK,      ?*wJwK,      ?*wu,
 		 ?*wJwK,     ?*wH,        ?*wK,        ?*wIwH,      ?r,
-		 r,          *c*l,        *h,          *h")
+		 r,          *h,          *h")
 
 	(match_operand:SI 1 "input_operand"
 		"r,          U,           m,           Z,           Z,
 		 r,          wI,          wH,          I,           L,
 		 n,          wIwH,        O,           wM,          wB,
 		 O,          wM,          wS,          r,           wIwH,
-		 *h,         r,           r,           0"))]
+		 *h,         r,           0"))]
 
   "gpc_reg_operand (operands[0], SImode)
    || gpc_reg_operand (operands[1], SImode)"
@@ -6880,21 +6880,20 @@
    mfvsrwz %0,%x1
    mf%1 %0
    mt%0 %1
-   mt%0 %1
    nop"
   [(set_attr "type"
 		"*,          *,           load,        fpload,      fpload,
 		 store,      fpstore,     fpstore,     *,           *,
 		 *,          veclogical,  vecsimple,   vecsimple,   vecsimple,
 		 veclogical, veclogical,  vecsimple,   mffgpr,      mftgpr,
-		 *,           *,           *,           *")
+		 *,          *,           *")
 
    (set_attr "length"
 		"4,          4,           4,           4,           4,
 		 4,          4,           4,           4,           4,
 		 8,          4,           4,           4,           4,
 		 4,          4,           8,           4,           4,
-		 4,          4,           4,           4")])
+		 4,          4,           4")])
 
 ;; Like movsi, but adjust a SF value to be used in a SI context, i.e.
 ;; (set (reg:SI ...) (subreg:SI (reg:SF ...) 0))
@@ -7172,9 +7171,9 @@
 
 (define_insn "*movcc_internal1"
   [(set (match_operand:CC 0 "nonimmediate_operand"
-			    "=y,x,?y,y,r,r,r,r,r,*c*l,r,m")
+			    "=y,x,?y,y,r,r,r,r, r,*c*l,r,m")
 	(match_operand:CC 1 "general_operand"
-			    " y,r, r,O,x,y,r,I,h,   r,m,r"))]
+			    " y,r, r,O,x,y,r,I,*h,   r,m,r"))]
   "register_operand (operands[0], CCmode)
    || register_operand (operands[1], CCmode)"
   "@
@@ -7326,11 +7325,11 @@
 ;;	LIS          G-const.   F/n-const  NOP
 (define_insn "*mov<mode>_softfloat"
   [(set (match_operand:FMOVE32 0 "nonimmediate_operand"
-	"=r,         cl,        r,         r,         m,         r,
+	"=r,         *c*l,      r,         r,         m,         r,
           r,         r,         r,         *h")
 
 	(match_operand:FMOVE32 1 "input_operand"
-	 "r,         r,         h,         m,         r,         I,
+	 "r,         r,         *h,        m,         r,         I,
           L,         G,         Fn,        0"))]
 
   "(gpc_reg_operand (operands[0], <MODE>mode)
@@ -7597,7 +7596,7 @@
 	(match_operand:FMOVE64 1 "input_operand"
             "d,           m,          d,          wY,         <f64_p9>,
              Z,           <f64_av>,   <f64_vsx>,  <zero_fp>,  <zero_fp>,
-             r,           YZ,         r,          r,          h,
+             r,           YZ,         r,          r,          *h,
              0,           wg,         r,          <f64_dm>,   r"))]
 
   "TARGET_POWERPC64 && TARGET_HARD_FLOAT
@@ -7638,11 +7637,11 @@
 
 (define_insn "*mov<mode>_softfloat64"
   [(set (match_operand:FMOVE64 0 "nonimmediate_operand"
-           "=Y,       r,      r,      cl,     r,      r,
+           "=Y,       r,      r,      *c*l,   r,      r,
              r,       r,      *h")
 
 	(match_operand:FMOVE64 1 "input_operand"
-            "r,       Y,      r,      r,      h,      G,
+            "r,       Y,      r,      r,      *h,     G,
              H,       F,      0"))]
 
   "TARGET_POWERPC64 && TARGET_SOFT_FLOAT

gcc/doc/md.texi

@@ -3273,7 +3273,7 @@ instructions.
 Vector constant that can be loaded with XXSPLTIB & sign extension.
 
 @item h
-@samp{MQ}, @samp{CTR}, or @samp{LINK} register
+@samp{VRSAVE}, @samp{CTR}, or @samp{LINK} register
 
 @item c
 @samp{CTR} register