[PATCH v1] rtl: builtins: Fix builtins feclearexcept and feraiseexcept operand check [PR94193]

[Raoni Fassina Firmino]

Tested on top of master (e0b8716f53ed6455e9f18931940141692793068d)
using --enable-checking=yes,rtl, on the following plataforms with no
regression:
  - powerpc64le-linux-gnu (Power 9)
  - powerpc64le-linux-gnu (Power 8)
  - powerpc64-linux-gnu (Power 9, with 32 and 64 bits tests)

I did not include a testcase because I could not figure out one that
works without --enable-checking=rtl yet.

---- 8< ----

Commit 4343f5e25679 ("rtl: builtins: (not just) rs6000: Add builtins
for fegetround, feclearexcept and feraiseexcept [PR94193]") broke gcc
bootstra when building with --enable-checking=rtl[1].

The function expand_builtin_feclear_feraise_except was failing to
proper validate op0 predicate before emit_insn leading to the mismatch
type failure.

[1] https://gcc.gnu.org/pipermail/gcc-patches/2022-January/589186.html

2022-01-26  Raoni Fassina Firmino  <raoni@linux.ibm.com>

gcc/
	PR target/94193
	* builtins.cc (expand_builtin_feclear_feraise_except): Add op0
	predicate check.

Signed-off-by: Raoni Fassina Firmino <raoni@linux.ibm.com>
---
 gcc/builtins.cc | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/gcc/builtins.cc b/gcc/builtins.cc
index e84208035dab..d784a57c2b81 100644
--- a/gcc/builtins.cc
+++ b/gcc/builtins.cc
@@ -2598,6 +2598,9 @@ expand_builtin_feclear_feraise_except (tree exp, rtx target,
   if (icode == CODE_FOR_nothing)
     return NULL_RTX;
 
+  if (!(*insn_data[icode].operand[1].predicate) (op0, GET_MODE (op0)))
+    return NULL_RTX;
+
   if (target == 0
       || GET_MODE (target) != target_mode
       || !(*insn_data[icode].operand[0].predicate) (target, target_mode))
-- 
2.34.1