rs6000: lxsdux / stxsdux do not exist

Our md files refer to {l,st}xsd%U<n>x, but no {l,st}xsdux insns exist.
This patch removes the update forms.  All these use  constraint "Z"
which does not allow update form, so there is no practical difference.


	* config/rs6000/rs6000.md (*mov<mode>_hardfloat32): Remove %U from the
	lxsdx and stxsdx alternatives.
	(*mov<mode>_hardfloat64): Ditto.
	* config/rs6000/vsx.md (*vsx_extract_<mode>_store): Ditto.

From-SVN: r264064

gcc/ChangeLog

+2018-09-03  Segher Boessenkool  <segher@kernel.crashing.org>
+
+	* config/rs6000/rs6000.md (*mov<mode>_hardfloat32): Remove %U from the
+	lxsdx and stxsdx alternatives.
+	(*mov<mode>_hardfloat64): Ditto.
+	* config/rs6000/vsx.md (*vsx_extract_<mode>_store): Ditto.
+
 2018-09-03  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/87200

gcc/config/rs6000/rs6000.md

@@ -7405,8 +7405,8 @@
    fmr %0,%1
    lxsd %0,%1
    stxsd %1,%0
-   lxsd%U1x %x0,%y1
-   stxsd%U0x %x1,%y0
+   lxsdx %x0,%y1
+   stxsdx %x1,%y0
    xxlor %x0,%x1,%x1
    xxlxor %x0,%x0,%x0
    #
@@ -7473,8 +7473,8 @@
    fmr %0,%1
    lxsd %0,%1
    stxsd %1,%0
-   lxsd%U1x %x0,%y1
-   stxsd%U0x %x1,%y0
+   lxsdx %x0,%y1
+   stxsdx %x1,%y0
    xxlor %x0,%x1,%x1
    xxlxor %x0,%x0,%x0
    li %0,0

gcc/config/rs6000/vsx.md

@@ -3265,7 +3265,7 @@
   "VECTOR_MEM_VSX_P (<MODE>mode)"
   "@
    stfd%U0%X0 %1,%0
-   stxsd%U0x %x1,%y0
+   stxsdx %x1,%y0
    stxsd %1,%0"
   [(set_attr "type" "fpstore")])