On Sat, Mar 09, 2024 at 12:25:42PM +0100, Richard Biener wrote: > Ideally we’d clear TREE_ADDRESSABLE but set DECL_NOT_GIMPLE_REG, > I think the analysis where we check the base would be a more > appropriate place to enforce that.
So like this? Bootstrapped/regtested on x86_64-linux and i686-linux. 2024-03-11 Jakub Jelinek <ja...@redhat.com> PR tree-optimization/114278 * tree-ssa.cc (maybe_optimize_var): If large/huge _BitInt vars are no longer addressable, set DECL_NOT_GIMPLE_REG_P on them. * gcc.dg/bitint-99.c: New test. --- gcc/tree-ssa.cc.jj 2024-01-03 11:51:39.902615009 +0100 +++ gcc/tree-ssa.cc 2024-03-09 23:34:12.469223987 +0100 @@ -1785,6 +1785,20 @@ maybe_optimize_var (tree var, bitmap add fprintf (dump_file, "\n"); } } + else if (TREE_CODE (TREE_TYPE (var)) == BITINT_TYPE + && (cfun->curr_properties & PROP_gimple_lbitint) != 0 + && TYPE_PRECISION (TREE_TYPE (var)) > MAX_FIXED_MODE_SIZE) + { + /* Don't rewrite large/huge _BitInt vars after _BitInt lowering + into SSA form. */ + DECL_NOT_GIMPLE_REG_P (var) = 1; + if (dump_file) + { + fprintf (dump_file, "_BitInt var after its lowering: "); + print_generic_expr (dump_file, var); + fprintf (dump_file, "\n"); + } + } else if (DECL_NOT_GIMPLE_REG_P (var)) { maybe_reg = true; --- gcc/testsuite/gcc.dg/bitint-99.c.jj 2024-03-08 14:26:17.658069942 +0100 +++ gcc/testsuite/gcc.dg/bitint-99.c 2024-03-08 14:25:36.292645965 +0100 @@ -0,0 +1,26 @@ +/* PR tree-optimization/114278 */ +/* { dg-do compile { target bitint } } */ +/* { dg-options "-O2 -fno-tree-dce -fno-tree-dse -fno-tree-ccp" } */ +/* { dg-additional-options "-mavx2" { target i?86-*-* x86_64-*-* } } */ + +void +foo (void *p) +{ + _BitInt(64) b = *(_BitInt(64) *) __builtin_memmove (&b, p, sizeof (_BitInt(64))); +} + +#if __BITINT_MAXWIDTH__ >= 128 +void +bar (void *p) +{ + _BitInt(128) b = *(_BitInt(128) *) __builtin_memmove (&b, p, sizeof (_BitInt(128))); +} +#endif + +#if __BITINT_MAXWIDTH__ >= 256 +void +baz (void *p) +{ + _BitInt(256) b = *(_BitInt(256) *) __builtin_memmove (&b, p, sizeof (_BitInt(256))); +} +#endif Jakub