The bcdinvalid_<mode> RTL instruction uses the "unordered" comparison,
which cannot be used if we have -ffinite-math-only. We really need
CCMODEs that describe what bits in a CR field are set by other insns
than just comparisons, but that is a lot more surgery, and it is stage 4
now. This patch does a simple workaround.
2021-03-16 Segher Boessenkool <seg...@kernel.crashing.org>
PR target/98092
* config/rs6000/predicates.md (branch_comparison_operator): Allow
ordered and unordered for CCFPmode, if flag_finite_math_only.
gcc/testsuite/
PR target/98092
* gcc.target/powerpc/pr98092.c: New.
---
gcc/config/rs6000/predicates.md | 9 +++++----
gcc/testsuite/gcc.target/powerpc/pr98092.c | 7 +++++++
2 files changed, 12 insertions(+), 4 deletions(-)
create mode 100644 gcc/testsuite/gcc.target/powerpc/pr98092.c
diff --git a/gcc/config/rs6000/predicates.md b/gcc/config/rs6000/predicates.md
index 69f3c709abbc..859af75dfbd1 100644
--- a/gcc/config/rs6000/predicates.md
+++ b/gcc/config/rs6000/predicates.md
@@ -1208,10 +1208,11 @@ (define_special_predicate "equality_operator"
(define_predicate "branch_comparison_operator"
(and (match_operand 0 "comparison_operator")
(match_test "GET_MODE_CLASS (GET_MODE (XEXP (op, 0))) == MODE_CC")
- (if_then_else (match_test "GET_MODE (XEXP (op, 0)) == CCFPmode
- && !flag_finite_math_only")
- (match_code "lt,gt,eq,unordered,unge,unle,ne,ordered")
- (match_code "lt,ltu,le,leu,gt,gtu,ge,geu,eq,ne"))
+ (if_then_else (match_test "GET_MODE (XEXP (op, 0)) == CCFPmode")
+ (if_then_else (match_test "flag_finite_math_only")
+ (match_code "lt,le,gt,ge,eq,ne,unordered,ordered")
+ (match_code "lt,gt,eq,unordered,unge,unle,ne,ordered"))
+ (match_code "lt,ltu,le,leu,gt,gtu,ge,geu,eq,ne"))
(match_test "validate_condition_mode (GET_CODE (op),
GET_MODE (XEXP (op, 0))),
1")))
diff --git a/gcc/testsuite/gcc.target/powerpc/pr98092.c
b/gcc/testsuite/gcc.target/powerpc/pr98092.c
new file mode 100644
index 000000000000..03eab5a24ef7
--- /dev/null
+++ b/gcc/testsuite/gcc.target/powerpc/pr98092.c
@@ -0,0 +1,7 @@
+/* { dg-options "-mdejagnu-cpu=power9 -ffinite-math-only" } */
+
+int
+h9 (__attribute__ ((altivec (vector__))) char un)
+{
+ return (__builtin_vec_bcdinvalid (un));
+}
--
1.8.3.1
