Change the size of the bitset from 128 bits to 96. This works around an apparent GCC 5.4 bug in which bad SSE code is generated, leading to a crash in ast_type_qualifier::validate_in_qualifier() (ast_type.cpp:654).
This can be repro'd with the Piglit test tests/spec/glsl-1.50/execution/ varying-struct-basic-gs-fs.shader_test Bugzilla:https://bugs.freedesktop.org/show_bug.cgi?id=105497 Cc: mesa-sta...@lists.freedesktop.org --- src/compiler/glsl/ast.h | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/src/compiler/glsl/ast.h b/src/compiler/glsl/ast.h index a1ec0d5..9b88ff5 100644 --- a/src/compiler/glsl/ast.h +++ b/src/compiler/glsl/ast.h @@ -474,7 +474,13 @@ enum { struct ast_type_qualifier { DECLARE_RALLOC_CXX_OPERATORS(ast_type_qualifier); - DECLARE_BITSET_T(bitset_t, 128); + /* Note: this bitset needs to have at least as many bits as the 'q' + * struct has flags, below. Previously, the size was 128 instead of 96. + * But an apparent bug in GCC 5.4.0 causes bad SSE code generation + * elsewhere, leading to a crash. 96 bits works around the issue. + * See https://bugs.freedesktop.org/show_bug.cgi?id=105497 + */ + DECLARE_BITSET_T(bitset_t, 96); union flags { struct { -- 2.7.4 _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/mesa-dev
