[PATCH-3, rs6000] Set CC mode of vector string isolate insns to CCEQ

[HAO CHEN GUI]

Hi,
  It's the third patch of a series of patches optimizing CC modes on
rs6000.

  This patch sets CC mode of vector string isolate insns to CCEQ instead
of CCFP as these insns only set/check CR bit 2.

  Bootstrapped and tested on powerpc64-linux BE and LE with no
regressions. Is it OK for the trunk?

Thanks
Gui Haochen

ChangeLog
rs6000: Set CC mode of vector string isolate insns to CCEQ

gcc/
        * config/rs6000/altivec.md (vstrir_p_direct_<mode>): Replace CCFP
        with CCEQ.
        (vstril_p_direct_<mode>): Likewise.

patch.diff
diff --git a/gcc/config/rs6000/altivec.md b/gcc/config/rs6000/altivec.md
index bd79a3f9e84..a883a814a82 100644
--- a/gcc/config/rs6000/altivec.md
+++ b/gcc/config/rs6000/altivec.md
@@ -932,9 +932,9 @@ (define_insn "vstrir_p_direct_<mode>"
        (unspec:VIshort
           [(match_operand:VIshort 1 "altivec_register_operand" "v")]
           UNSPEC_VSTRIR))
-   (set (reg:CC CR6_REGNO)
-       (unspec:CC [(match_dup 1)]
-                  UNSPEC_VSTRIR))]
+   (set (reg:CCEQ CR6_REGNO)
+       (unspec:CCEQ [(match_dup 1)]
+                    UNSPEC_VSTRIR))]
   "TARGET_POWER10"
   "vstri<wd>r. %0,%1"
   [(set_attr "type" "vecsimple")])
@@ -984,9 +984,9 @@ (define_insn "vstril_p_direct_<mode>"
        (unspec:VIshort
           [(match_operand:VIshort 1 "altivec_register_operand" "v")]
           UNSPEC_VSTRIL))
-   (set (reg:CC CR6_REGNO)
-       (unspec:CC [(match_dup 1)]
-                  UNSPEC_VSTRIR))]
+   (set (reg:CCEQ CR6_REGNO)
+       (unspec:CCEQ [(match_dup 1)]
+                    UNSPEC_VSTRIR))]
   "TARGET_POWER10"
   "vstri<wd>l. %0,%1"
   [(set_attr "type" "vecsimple")])