glsl: Switch ast_type_qualifier to a 128-bit bitset.

This should end the drought of bits in the ast_type_qualifier object.
The bitset_t type works pretty much as a drop-in replacement for the
current uint64_t bitset.

The only catch is that the bitset_t type as defined in the previous
commit doesn't have a trivial constructor (because it has a
user-defined constructor), so it cannot be used as union member
without providing a user-defined constructor for the union (which
causes it in turn to be non-trivially constructible).  This annoyance
could be easily addressed in C++11 by declaring the default
constructor of bitset_t to be the implicitly defined one -- IMO one
more reason to drop support for GCC 4.2-4.3.

The other minor change was required because glsl_parser_extras.cpp was
hard-coding the type of bitset temporaries as uint64_t, which (unlike
would have been the case if the uint64_t had been replaced with
e.g. an __int128) would otherwise have caused a build failure, because
the boolean conversion operator of bitset_t is marked explicit (if
C++11 is available), so the bitset won't be silently truncated down to
1 bit in order to use it to initialize the uint64_t temporaries
(yikes).

Reviewed-by: Plamena Manolova <[email protected]>

1 files changed, 2 insertions, 2 deletions

diff --git a/src/compiler/glsl/glsl_parser_extras.cpp b/src/compiler/glsl/glsl_parser_extras.cpp
index 81d74e92ce3..106417c5c30 100644
--- a/src/compiler/glsl/glsl_parser_extras.cpp
+++ b/src/compiler/glsl/glsl_parser_extras.cpp
@@ -1011,7 +1011,7 @@ _mesa_ast_process_interface_block(YYLTYPE *locp,
                            "an instance name are not allowed");
    }
 
-   uint64_t interface_type_mask;
+   ast_type_qualifier::bitset_t interface_type_mask;
    struct ast_type_qualifier temp_type_qualifier;
 
    /* Get a bitmask containing only the in/out/uniform/buffer
@@ -1030,7 +1030,7 @@ _mesa_ast_process_interface_block(YYLTYPE *locp,
     * production rule guarantees that only one bit will be set (and
     * it will be in/out/uniform).
     */
-   uint64_t block_interface_qualifier = q.flags.i;
+   ast_type_qualifier::bitset_t block_interface_qualifier = q.flags.i;
 
    block->default_layout.flags.i |= block_interface_qualifier;