[PATCH] Optab: add isnormal_optab for __builtin_isnormal

[HAO CHEN GUI <guihaoc@linux.ibm.com>]

Hi,
  This patch adds an optab for __builtin_isnormal. The normal check can be
implemented on rs6000 by a single instruction. It needs an optab to be
expanded to the certain sequence of instructions.

  The subsequent patches will implement the expand on rs6000.

  Bootstrapped and tested on x86 and powerpc64-linux BE and LE with no
regressions. Is this OK for next stage-1?

Thanks
Gui Haochen
ChangeLog
optab: Add isnormal_optab for isnormal builtin

gcc/
	* builtins.cc (interclass_mathfn_icode): Set optab to isnormal_optab
	for isnormal builtin.
	* optabs.def (isnormal_optab): New.

patch.diff
diff --git a/gcc/builtins.cc b/gcc/builtins.cc
index 3174f52ebe8..defb39de95f 100644
--- a/gcc/builtins.cc
+++ b/gcc/builtins.cc
@@ -2462,6 +2462,7 @@ interclass_mathfn_icode (tree arg, tree fndecl)
     case BUILT_IN_ISFINITE:
       builtin_optab = isfinite_optab; break;
     case BUILT_IN_ISNORMAL:
+      builtin_optab = isnormal_optab; break;
     CASE_FLT_FN (BUILT_IN_FINITE):
     case BUILT_IN_FINITED32:
     case BUILT_IN_FINITED64:
diff --git a/gcc/optabs.def b/gcc/optabs.def
index dcd77315c2a..3c401fc0b4c 100644
--- a/gcc/optabs.def
+++ b/gcc/optabs.def
@@ -353,6 +353,7 @@ OPTAB_D (hypot_optab, "hypot$a3")
 OPTAB_D (ilogb_optab, "ilogb$a2")
 OPTAB_D (isinf_optab, "isinf$a2")
 OPTAB_D (isfinite_optab, "isfinite$a2")
+OPTAB_D (isnormal_optab, "isnormal$a2")
 OPTAB_D (issignaling_optab, "issignaling$a2")
 OPTAB_D (ldexp_optab, "ldexp$a3")
 OPTAB_D (log10_optab, "log10$a2")