diff options
| author | Bryan Cain <[email protected]> | 2011-08-27 18:32:58 -0500 |
|---|---|---|
| committer | Kenneth Graunke <[email protected]> | 2011-08-31 12:02:18 -0700 |
| commit | 478034f34a59969103237eb78bc82f9e70fe81c2 (patch) | |
| tree | 124922638fd8c7f981331cc6dbb5e1ceda6bd07f /src/mesa/drivers/dri | |
| parent | 87679e2ea10836d89f47a37b8e94cce0d319622e (diff) | |
glsl: Use a separate div_to_mul_rcp lowering flag for integers.
Using multiply and reciprocal for integer division involves potentially
lossy floating point conversions. This is okay for older GPUs that
represent integers as floating point, but undesirable for GPUs with
native integer division instructions.
TGSI, for example, has UDIV/IDIV instructions for integer division,
so it makes sense to handle this directly. Likewise for i965.
Reviewed-by: Ian Romanick <[email protected]>
Signed-off-by: Bryan Cain <[email protected]>
Signed-off-by: Kenneth Graunke <[email protected]>
Diffstat (limited to 'src/mesa/drivers/dri')
| -rw-r--r-- | src/mesa/drivers/dri/i965/brw_shader.cpp | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_shader.cpp b/src/mesa/drivers/dri/i965/brw_shader.cpp index 0a21094708b..a6ed810a16e 100644 --- a/src/mesa/drivers/dri/i965/brw_shader.cpp +++ b/src/mesa/drivers/dri/i965/brw_shader.cpp @@ -100,6 +100,7 @@ brw_link_shader(struct gl_context *ctx, struct gl_shader_program *prog) lower_instructions(shader->ir, MOD_TO_FRACT | DIV_TO_MUL_RCP | + INT_DIV_TO_MUL_RCP | SUB_TO_ADD_NEG | EXP_TO_EXP2 | LOG_TO_LOG2); |