gcc.dg/torture/bitint-18.c triggers an ICE in push_partial_def when
compiling for RISC-V with -O2. The issue occurs because
build_nonstandard_integer_type cannot handle bit widths larger than
MAX_FIXED_MODE_SIZE.
For BITINT_TYPE with maxsizei > MAX_FIXED_MODE_SIZE, use build_bitint_type
instead of build_nonstandard_integer_type, similar to what tree-sra.cc does.
gcc/ChangeLog:
* tree-ssa-sccvn.cc (vn_walk_cb_data::push_partial_def): Use
build_bitint_type for BITINT_TYPE when maxsizei exceeds
MAX_FIXED_MODE_SIZE.
---
gcc/tree-ssa-sccvn.cc | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/gcc/tree-ssa-sccvn.cc b/gcc/tree-ssa-sccvn.cc
index 16343d2a407..3f9a89fbc20 100644
--- a/gcc/tree-ssa-sccvn.cc
+++ b/gcc/tree-ssa-sccvn.cc
@@ -2316,7 +2316,13 @@ vn_walk_cb_data::push_partial_def (pd_data pd,
/* Make sure to interpret in a type that has a range covering the whole
access size. */
if (INTEGRAL_TYPE_P (vr->type) && maxsizei != TYPE_PRECISION (vr->type))
- type = build_nonstandard_integer_type (maxsizei, TYPE_UNSIGNED (type));
+ {
+ if (TREE_CODE (vr->type) == BITINT_TYPE
+ && maxsizei > MAX_FIXED_MODE_SIZE)
+ type = build_bitint_type (maxsizei, TYPE_UNSIGNED (type));
+ else
+ type = build_nonstandard_integer_type (maxsizei, TYPE_UNSIGNED (type));
+ }
tree val;
if (BYTES_BIG_ENDIAN)
{
--
2.52.0
