> Am 17.03.2023 um 18:48 schrieb Jakub Jelinek <ja...@redhat.com>:
>
> Hi!
>
> The following testcase ICEs, because we call tree_function_versioning from
> old_decl which has target attributes not supporting V4DImode and so
> DECL_MODE of DECL_ARGUMENTS is BLKmode, while new_decl supports those.
> tree_function_versioning initially copies DECL_RESULT and DECL_ARGUMENTS
> from old_decl to new_decl, then calls initialize_cfun to create cfun
> and only when the cfun is created it can later actually remap_decl
> DECL_RESULT and DECL_ARGUMENTS etc.
> The problem is that initialize_cfun -> push_struct_function ->
> allocate_struct_function calls relayout_decl on DECL_RESULT and
> DECL_ARGUMENTS, which clobbers DECL_MODE of old_decl and we then ICE because
> of it.
> In particular, allocate_struct_function does:
> if (!abstract_p)
> {
> /* Now that we have activated any function-specific attributes
> that might affect layout, particularly vector modes, relayout
> each of the parameters and the result. */
> relayout_decl (result);
> for (tree parm = DECL_ARGUMENTS (fndecl); parm;
> parm = DECL_CHAIN (parm))
> relayout_decl (parm);
>
> /* Similarly relayout the function decl. */
> targetm.target_option.relayout_function (fndecl);
> }
>
> if (!abstract_p && aggregate_value_p (result, fndecl))
> {
> #ifdef PCC_STATIC_STRUCT_RETURN
> cfun->returns_pcc_struct = 1;
> #endif
> cfun->returns_struct = 1;
> }
> Now, in the case of tree_function_versioning, I believe all that we need
> from these is possibly the
> targetm.target_option.relayout_function (fndecl);
> call (arm only), we will remap DECL_RESULT and DECL_ARGUMENTS later on
> and copy_decl_for_dup_finish in that case will handle all we need:
> /* For vector typed decls make sure to update DECL_MODE according
> to the new function context. */
> if (VECTOR_TYPE_P (TREE_TYPE (copy)))
> SET_DECL_MODE (copy, TYPE_MODE (TREE_TYPE (copy)));
> We don't need the cfun->returns_*struct either, because we override it
> in initialize_cfun a few lines later:
> /* Copy items we preserve during cloning. */
> ...
> cfun->returns_struct = src_cfun->returns_struct;
> cfun->returns_pcc_struct = src_cfun->returns_pcc_struct;
>
> So, to avoid the clobbering of DECL_RESULT/DECL_ARGUMENTS of old_decl,
> the following patch arranges allocate_struct_function to be called with
> abstract_p true and calls targetm.target_option.relayout_function (fndecl);
> by hand.
>
> The removal of DECL_RESULT/DECL_ARGUMENTS copying at the start of
> initialize_cfun is removed because the only caller -
> tree_function_versioning, does that unconditionally before.
>
> Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?
Ok.
Thanks,
Richard
> 2023-03-17 Jakub Jelinek <ja...@redhat.com>
>
> PR target/105554
> * function.h (push_struct_function): Add ABSTRACT_P argument defaulted
> to false.
> * function.cc (push_struct_function): Add ABSTRACT_P argument, pass it
> to allocate_struct_function instead of false.
> * tree-inline.cc (initialize_cfun): Don't copy DECL_ARGUMENTS
> nor DECL_RESULT here. Pass true as ABSTRACT_P to
> push_struct_function. Call targetm.target_option.relayout_function
> after it.
> (tree_function_versioning): Formatting fix.
>
> * gcc.target/i386/pr105554.c: New test.
>
> --- gcc/function.h.jj 2023-01-12 21:04:08.647239183 +0100
> +++ gcc/function.h 2023-03-17 10:47:27.489571469 +0100
> @@ -687,7 +687,7 @@ extern void pop_cfun (void);
> extern int get_next_funcdef_no (void);
> extern int get_last_funcdef_no (void);
> extern void allocate_struct_function (tree, bool);
> -extern void push_struct_function (tree fndecl);
> +extern void push_struct_function (tree fndecl, bool = false);
> extern void push_dummy_function (bool);
> extern void pop_dummy_function (void);
> extern void init_dummy_function_start (void);
> --- gcc/function.cc.jj 2023-01-14 10:00:20.308560059 +0100
> +++ gcc/function.cc 2023-03-17 10:48:10.009945483 +0100
> @@ -4891,7 +4891,7 @@ allocate_struct_function (tree fndecl, b
> instead of just setting it. */
>
> void
> -push_struct_function (tree fndecl)
> +push_struct_function (tree fndecl, bool abstract_p)
> {
> /* When in_dummy_function we might be in the middle of a pop_cfun and
> current_function_decl and cfun may not match. */
> @@ -4900,7 +4900,7 @@ push_struct_function (tree fndecl)
> || (cfun && current_function_decl == cfun->decl));
> cfun_stack.safe_push (cfun);
> current_function_decl = fndecl;
> - allocate_struct_function (fndecl, false);
> + allocate_struct_function (fndecl, abstract_p);
> }
>
> /* Reset crtl and other non-struct-function variables to defaults as
> --- gcc/tree-inline.cc.jj 2023-01-19 09:58:51.037226790 +0100
> +++ gcc/tree-inline.cc 2023-03-17 10:56:50.321285330 +0100
> @@ -2781,16 +2781,12 @@ initialize_cfun (tree new_fndecl, tree c
> {
> struct function *src_cfun = DECL_STRUCT_FUNCTION (callee_fndecl);
>
> - if (!DECL_ARGUMENTS (new_fndecl))
> - DECL_ARGUMENTS (new_fndecl) = DECL_ARGUMENTS (callee_fndecl);
> - if (!DECL_RESULT (new_fndecl))
> - DECL_RESULT (new_fndecl) = DECL_RESULT (callee_fndecl);
> -
> /* Register specific tree functions. */
> gimple_register_cfg_hooks ();
>
> /* Get clean struct function. */
> - push_struct_function (new_fndecl);
> + push_struct_function (new_fndecl, true);
> + targetm.target_option.relayout_function (new_fndecl);
>
> /* We will rebuild these, so just sanity check that they are empty. */
> gcc_assert (VALUE_HISTOGRAMS (cfun) == NULL);
> @@ -6235,8 +6231,7 @@ tree_function_versioning (tree old_decl,
> id.transform_return_to_modify = false;
> id.transform_parameter = false;
>
> - old_entry_block = ENTRY_BLOCK_PTR_FOR_FN
> - (DECL_STRUCT_FUNCTION (old_decl));
> + old_entry_block = ENTRY_BLOCK_PTR_FOR_FN (DECL_STRUCT_FUNCTION (old_decl));
> DECL_RESULT (new_decl) = DECL_RESULT (old_decl);
> DECL_ARGUMENTS (new_decl) = DECL_ARGUMENTS (old_decl);
> initialize_cfun (new_decl, old_decl,
> --- gcc/testsuite/gcc.target/i386/pr105554.c.jj 2023-03-17
> 10:11:38.998223934 +0100
> +++ gcc/testsuite/gcc.target/i386/pr105554.c 2023-03-17 10:11:38.998223934
> +0100
> @@ -0,0 +1,10 @@
> +/* PR target/105554 */
> +/* { dg-do compile } */
> +/* { dg-options "-O2 -Wno-psabi -mno-sse3" } */
> +
> +typedef long long v4di __attribute__((__vector_size__(32)));
> +
> +__attribute__((target_clones ("arch=core-avx2", "default"))) void
> +foo (v4di x)
> +{
> +}
>
> Jakub
>
Re: [PATCH] tree-inline: Fix up multiversioning with vector arguments [PR105554]
Richard Biener via Gcc-patches Fri, 17 Mar 2023 10:53:11 -0700
- [PATCH] tree-inline: Fix up multiversioning... Jakub Jelinek via Gcc-patches
- Re: [PATCH] tree-inline: Fix up multiv... Richard Biener via Gcc-patches
