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GCC, the GNU Compiler Collection that is the Free Software Foundation open-source compiler for C, C++, Fortran, Java, ADA, and other languages.

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Add diagnostic paths
dmalcolm: This patch adds support for associating a "diagnostic_path" with a diagnostic: a sequence of events predicted by the compiler that leads to the problem occurring, with their locations in the user's source, text descriptions, and stack information (for handling interprocedural paths). For example, the following (hypothetical) error has a 3-event intraprocedural path: test.c: In function 'demo': test.c:29:5: error: passing NULL as argument 1 to 'PyList_Append' which requires a non-NULL parameter 29 | PyList_Append(list, item); | ^~~~~~~~~~~~~~~~~~~~~~~~~ 'demo': events 1-3 | | 25 | list = PyList_New(0); | | ^~~~~~~~~~~~~ | | | | | (1) when 'PyList_New' fails, returning NULL | 26 | | 27 | for (i = 0; i < count; i++) { | | ~~~ | | | | | (2) when 'i < count' | 28 | item = PyLong_FromLong(random()); | 29 | PyList_Append(list, item); | | ~~~~~~~~~~~~~~~~~~~~~~~~~ | | | | | (3) when calling 'PyList_Append', passing NULL from (1) as argument 1 | The patch adds a new "%@" format code for printing event IDs, so that in the above, the description of event (3) mentions event (1), showing the user where the bogus NULL value comes from (the event IDs are colorized to draw the user's attention to them). There is a separation between data vs presentation: the above shows how the diagnostic-printing code has consolidated the path into a single run of events, since all the events are near each other and within the same function; more complicated examples (such as interprocedural paths) might be printed as multiple runs of events. Examples of how interprocedural paths are printed can be seen in the test suite (which uses a plugin to exercise the code without relying on specific warnings using this functionality). Other output formats include- JSON,- printing each event as a separate "note", and - to not emit paths. gcc/ChangeLog: - Makefile.in (OBJS): Add tree-diagnostic-path.o. - common.opt (fdiagnostics-path-format=): New option.

[AArch64] Make -msve-vector-bits=128 generate VL-specific code
rsandifo: related_vector_mode and compatible_vector_types_p make it possible to generate 128-bit SVE code while still maintaining the distinction between SVE vectors and Advanced SIMD vectors.

libstdc++: Make istreambuf_iterator base class consistent (PR92285)
redi: Since LWG 445 was implemented for GCC 4.7, the std::iterator base class of std::istreambuf_iterator changes type depending on the -std mode used.

OpenACC – support "if" + "if_present" clauses with "host_data"
burnus: 2020-01-10 Gergö Barany Thomas Schwinge Julian Brown Tobias Burnus

compiler: don't add composite literal keys to package bindings
ian: Adding composite literal keys to package bindings gets confusing when it is combined with dot imports.

[amdgcn] Add support for sub-word sync_compare_and_swap operations
kcy: 2020-01-09 Kwok Cheung Yeung

[AArch64] Tweak iterator usage for [SU]Q{ADD,SUB}
rsandifo: The pattern: ;; <su>q<addsub> (define_insn "aarch64_<su_optab><optab><mode>" [(set (match_operand:VSDQ_I 0 "register_operand" "=w") (BINQOPS:VSDQ_I (match_operand:VSDQ_I 1 "register_operand" "w") (match_operand:VSDQ_I 2 "register_operand" "w")))] "TARGET_SIMD" "<su_optab><optab>\\t%<v>0<Vmtype>, %<v>1<Vmtype>, %<v>2<Vmtype>" [(set_attr "type" "neon_<optab><q>")] ) meant that we overloaded "optab" to be "qadd" for both SQADD and UQADD.

Add a compatible_vector_types_p target hook
rsandifo: One problem with adding an N-bit vector extension to an existing architecture is to decide how N-bit vectors should be passed to functions and returned from functions.

Add Optimization for various IPA parameters
marxin: 2020-01-09 Martin Liska - auto-profile.c (auto_profile): Use opt_for_fn for a parameter. - ipa-cp.c (ipcp_lattice::add_value): Likewise.

Remove constexpr support for DECL_BY_REFERENCE.
jason: Since we switched to doing constexpr evaluation on pre-GENERIC trees, we don't have to handle DECL_BY_REFERENCE.

GCC Release Tags

libgo: update to Go 1.12.2
ian: Reviewed-on:

libgo: update to Go 1.12.1
ian: Reviewed-on:

libgo: update to Go 1.12 release
ian: Reviewed-on:

libgo: update to Go 1.11.1 release
ian: Reviewed-on:

[libgomp, nvptx] Note that cuGetErrorString is in CUDA_VERSION >= 6000
vries: Cuda driver api function cuGetErrorString is available in version 6.0 and higher. This patch:- removes a comment saying the declaration is not available in cuda.h 6.0- fixes the presence test to use CUDA_VERSION < 6000- moves the declaration to toplevel Build on x86_64 with nvptx accelerator and reg-tested libgomp. 2018-08-08 Tom de Vries - plugin/plugin-nvptx.c (cuda_error): Move declaration of cuGetErrorString ...

libgo: update to Go 1.10.3 release
ian: Reviewed-on:

libgo: update to Go 1.10.2 release
ian: Reviewed-on:

libgo: update to final Go 1.10 release
ian: Reviewed-on:

Cleanup Solaris linker version checks
ro: - acinclude.m4 (gcc_AC_INITFINI_ARRAY): Don't require gcc_SUN_LD_VERSION.

Conversion operators have a special name * cp-tree.h (CPTI_CONV_OP_MARKER, CPTI_CONV_OP_IDENTIFIER): New. (conv_op_marker, conv_op_identifier): New. (CLASSTYPE_F
nathan: Conversion operators have a special name - cp-tree.h (CPTI_CONV_OP_MARKER, CPTI_CONV_OP_IDENTIFIER): New.

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Fix SSA update when vectorisation adds a vdef to a read-only loop
rsandifo: This patch fixes an awkward corner case in which: (a) we apply if-conversion to a loop; (b) the original scalar loop doesn't have a vdef, and thus doesn't need a virtual phi; (c) the vectorised main loop does need a vdef and a virtual phi (see below); (d) we also vectorise the epilogue; and (e) the vectorised epilogue still needs a scalar epilogue The specific case in which (c) applies is if a read-only loop is vectorised using IFN_LOAD_LANES, which uses clobber statements to mark the lifetime of the temporary array. The vectoriser relies on the SSA renamer to update virtual operands.

[amdgcn] Add more modes for vector comparisons
ams: 2020-01-07 Andrew Stubbs gcc/ - config/gcn/gcn-valu.md (VEC_1REG_INT_ALT): Delete iterator.

[Arm] Enable CLI for Armv8.6-a: armv8.6-a, i8mm and bf16.
xczhang: 2020-01-02 Dennis Zhang - config/arm/arm-c.c (arm_cpu_builtins): Define __ARM_FEATURE_MATMUL_INT8, __ARM_FEATURE_BF16_VECTOR_ARITHMETIC, __ARM_FEATURE_BF16_SCALAR_ARITHMETIC, and __ARM_BF16_FORMAT_ALTERNATIVE when enabled. - config/arm/arm-cpus.in (armv8_6, i8mm, bf16): New features. - config/arm/arm-tables.opt: Regenerated. - config/arm/arm.c (arm_option_reconfigure_globals): Initialize arm_arch_i8mm and arm_arch_bf16 when enabled. - config/arm/arm.h (TARGET_I8MM): New macro.

Add support for large prefixed address in adjusting a vector address
meissner: 2020-01-06 Michael Meissner <meissner@linux.ibm.com>

Add a generic lhd_simulate_enum_decl
rsandifo: Normally we only create SVE ACLE functions when arm_sve.h is included.

[AArch64] Use type attributes to mark types that use the SVE PCS
rsandifo: The SVE port needs to maintain a different type identity for GNU vectors and "SVE vectors", since the types use different ABIs.

Remove constexpr support for DECL_BY_REFERENCE.
jason: Since we switched to doing constexpr evaluation on pre-GENERIC trees, we don't have to handle DECL_BY_REFERENCE.

GCC

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