Hi! The following testcase ICEs because BITINT_TYPE isn't handled in type_contains_placeholder_1. Given that Ada doesn't emit it, it doesn't matter that much where exactly we handle it as right now it should never contain a placeholder; I've picked the same spot as INTEGER_TYPE, but if you prefer e.g. the one with OFFSET_TYPE above, I can move it there too.
Bootstrapped/regtested on x86_64-linux, ok for trunk? 2023-11-14 Jakub Jelinek <ja...@redhat.com> PR middle-end/112511 * tree.cc (type_contains_placeholder_1): Handle BITINT_TYPE like INTEGER_TYPE. * gcc.dg/pr112511.c: New test. --- gcc/tree.cc.jj 2023-11-09 09:04:20.357518740 +0100 +++ gcc/tree.cc 2023-11-13 14:57:33.001715799 +0100 @@ -4210,6 +4210,7 @@ type_contains_placeholder_1 (const_tree return false; case INTEGER_TYPE: + case BITINT_TYPE: case REAL_TYPE: case FIXED_POINT_TYPE: /* Here we just check the bounds. */ --- gcc/testsuite/gcc.dg/pr112511.c.jj 2023-11-13 15:00:13.872457749 +0100 +++ gcc/testsuite/gcc.dg/pr112511.c 2023-11-13 14:59:59.933653398 +0100 @@ -0,0 +1,17 @@ +/* PR middle-end/112511 */ +/* { dg-do compile { target bitint } } */ +/* { dg-options "-O2" } */ + +struct T { _BitInt(22) a; }; + +void +bar (struct T t) +{ +} + +void +foo (void) +{ + struct T t; + bar (t); +} Jakub