diff options
| author | Matt Turner <[email protected]> | 2013-09-17 21:34:15 -0700 |
|---|---|---|
| committer | Matt Turner <[email protected]> | 2013-10-07 10:43:19 -0700 |
| commit | 06e41a02a3564b00404dd3dd5d6f6b5897df36e9 (patch) | |
| tree | c8addcab70dc2f20e65df76fd2570230ff5e64bd /src/glsl/builtin_functions.cpp | |
| parent | 69909c866b6595f80d206c8e2484b1dc6668e7be (diff) | |
glsl: Implement [iu]mulExtended() built-ins for ARB_gpu_shader5.
These built-ins have two "out" parameters, which makes implementing them
efficiently with our current compiler infrastructure difficult. Instead,
implement them in terms of the existing ir_binop_mul IR (to return the
low 32-bits) and a new ir_binop_mul64 which returns the high 32-bits.
v2: Rename mul64 -> imul_high as suggested by Ken.
Reviewed-by: Kenneth Graunke <[email protected]>
Diffstat (limited to 'src/glsl/builtin_functions.cpp')
| -rw-r--r-- | src/glsl/builtin_functions.cpp | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/src/glsl/builtin_functions.cpp b/src/glsl/builtin_functions.cpp index 5b1b9c3b7c1..d40888d3819 100644 --- a/src/glsl/builtin_functions.cpp +++ b/src/glsl/builtin_functions.cpp @@ -533,6 +533,7 @@ private: B2(frexp) B1(uaddCarry) B1(usubBorrow) + B1(mulExtended) #undef B0 #undef B1 #undef B2 @@ -1961,6 +1962,18 @@ builtin_builder::create_builtins() _usubBorrow(glsl_type::uvec3_type), _usubBorrow(glsl_type::uvec4_type), NULL); + add_function("imulExtended", + _mulExtended(glsl_type::int_type), + _mulExtended(glsl_type::ivec2_type), + _mulExtended(glsl_type::ivec3_type), + _mulExtended(glsl_type::ivec4_type), + NULL); + add_function("umulExtended", + _mulExtended(glsl_type::uint_type), + _mulExtended(glsl_type::uvec2_type), + _mulExtended(glsl_type::uvec3_type), + _mulExtended(glsl_type::uvec4_type), + NULL); #undef F #undef FI #undef FIU @@ -3762,6 +3775,24 @@ builtin_builder::_usubBorrow(const glsl_type *type) return sig; } + +/** + * For both imulExtended() and umulExtended() built-ins. + */ +ir_function_signature * +builtin_builder::_mulExtended(const glsl_type *type) +{ + ir_variable *x = in_var(type, "x"); + ir_variable *y = in_var(type, "y"); + ir_variable *msb = out_var(type, "msb"); + ir_variable *lsb = out_var(type, "lsb"); + MAKE_SIG(glsl_type::void_type, gpu_shader5, 4, x, y, msb, lsb); + + body.emit(assign(msb, imul_high(x, y))); + body.emit(assign(lsb, mul(x, y))); + + return sig; +} /** @} */ /******************************************************************************/ |