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| author | Thomas Schwinge <tschwinge@baylibre.com> | 2025-03-20 14:21:26 +0100 |
|---|---|---|
| committer | Thomas Schwinge <tschwinge@baylibre.com> | 2025-03-24 09:39:21 +0100 |
| commit | 65b31b3fff2fced015ded1026733605f34053796 (patch) | |
| tree | 758786ed43b6e8a76b92cb555914ed0d72270d16 | |
| parent | 5450afcfb761834b7f4156022f1ec38f2226c193 (diff) | |
| download | gcc-65b31b3fff2fced015ded1026733605f34053796.zip gcc-65b31b3fff2fced015ded1026733605f34053796.tar.gz gcc-65b31b3fff2fced015ded1026733605f34053796.tar.bz2 | |
nvptx: In offloading compilation, special-case certain host-setup symbol aliases [PR101544]
Namely, use PTX '.alias' even for (default) '-mno-alias' if the host made the
C++ "base and complete [cd]tor aliases".
PR target/101544
gcc/
* config/nvptx/nvptx.cc (nvptx_asm_output_def_from_decls)
[ACCEL_COMPILER]: Special-case certain host-setup symbol aliases.
* varasm.cc (do_assemble_alias) [ACCEL_COMPILER]: Adjust.
| -rw-r--r-- | gcc/config/nvptx/nvptx.cc | 28 | ||||
| -rw-r--r-- | gcc/varasm.cc | 7 |
2 files changed, 33 insertions, 2 deletions
diff --git a/gcc/config/nvptx/nvptx.cc b/gcc/config/nvptx/nvptx.cc index 5cd4b24..022037f 100644 --- a/gcc/config/nvptx/nvptx.cc +++ b/gcc/config/nvptx/nvptx.cc @@ -245,7 +245,7 @@ default_ptx_version_option (void) warp convergence. */ res = MAX (res, PTX_VERSION_6_0); - /* Pick at least 6.3. */ + /* Pick at least 6.3, to enable PTX '.alias'. */ res = MAX (res, PTX_VERSION_6_3); /* For sm_52+, pick at least 7.3, to enable PTX 'alloca'. */ @@ -7713,6 +7713,30 @@ nvptx_asm_output_def_from_decls (FILE *stream, tree name, { if (nvptx_alias == 0 || !TARGET_PTX_6_3) { + /* Symbol aliases are not supported here. */ + +#ifdef ACCEL_COMPILER + if (DECL_CXX_CONSTRUCTOR_P (name) + || DECL_CXX_DESTRUCTOR_P (name)) + { + /* ..., but symbol aliases are supported and used in the host system, + via 'gcc/cp/optimize.cc:can_alias_cdtor'. */ + + gcc_assert (!lookup_attribute ("weak", DECL_ATTRIBUTES (name))); + gcc_assert (TREE_CODE (name) == FUNCTION_DECL); + + /* In this specific case, use PTX '.alias', if available, even for + (default) '-mno-alias'. */ + if (TARGET_PTX_6_3) + { + DECL_ATTRIBUTES (name) + = tree_cons (get_identifier ("symbol alias handled"), + NULL_TREE, DECL_ATTRIBUTES (name)); + goto emit_ptx_alias; + } + } +#endif + /* Copied from assemble_alias. */ error_at (DECL_SOURCE_LOCATION (name), "alias definitions not supported in this configuration"); @@ -7744,6 +7768,8 @@ nvptx_asm_output_def_from_decls (FILE *stream, tree name, return; } + emit_ptx_alias: + cgraph_node *cnode = cgraph_node::get (name); if (!cnode->referred_to_p ()) /* Prevent "Internal error: reference to deleted section". */ diff --git a/gcc/varasm.cc b/gcc/varasm.cc index eddfb6a..10c1d2e 100644 --- a/gcc/varasm.cc +++ b/gcc/varasm.cc @@ -6525,7 +6525,12 @@ do_assemble_alias (tree decl, tree target) IDENTIFIER_POINTER (target)); # endif /* If symbol aliases aren't actually supported... */ - if (!TARGET_SUPPORTS_ALIASES) + if (!TARGET_SUPPORTS_ALIASES +# ifdef ACCEL_COMPILER + /* ..., and unless special-cased... */ + && !lookup_attribute ("symbol alias handled", DECL_ATTRIBUTES (decl)) +# endif + ) /* ..., 'ASM_OUTPUT_DEF{,_FROM_DECLS}' better have raised an error. */ gcc_checking_assert (seen_error ()); #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL) |