diff options
| author | Kenneth Graunke <[email protected]> | 2012-12-01 23:49:26 -0800 |
|---|---|---|
| committer | Matt Turner <[email protected]> | 2013-02-28 13:18:59 -0800 |
| commit | 93066ce1299a7be8f670e527f249940c635605b4 (patch) | |
| tree | 1e7c958b7feb9a605a6c9f482bc68798990c89f4 /src/glsl/ir_optimization.h | |
| parent | 18281d60889c7bb0ef14d2aa8a080cdaead7adb3 (diff) | |
glsl: Convert mix() to use a new ir_triop_lrp opcode.
Many GPUs have an instruction to do linear interpolation which is more
efficient than simply performing the algebra necessary (two multiplies,
an add, and a subtract).
Pattern matching or peepholing this is more desirable, but can be
tricky. By using an opcode, we can at least make shaders which use the
mix() built-in get the more efficient behavior.
Currently, all consumers lower ir_triop_lrp. Subsequent patches will
actually generate different code.
v2 [mattst88]:
- Add LRP_TO_ARITH flag to ir_to_mesa.cpp. Will be removed in a
subsequent patch and ir_triop_lrp translated directly.
v3 [mattst88]:
- Move changes from the next patch to opt_algebraic.cpp to accept
3-src operations.
Reviewed-by: Matt Turner <[email protected]>
Reviewed-by: Eric Anholt <[email protected]>
Signed-off-by: Kenneth Graunke <[email protected]>
Diffstat (limited to 'src/glsl/ir_optimization.h')
| -rw-r--r-- | src/glsl/ir_optimization.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/src/glsl/ir_optimization.h b/src/glsl/ir_optimization.h index 8f33018404e..2454bbe6f66 100644 --- a/src/glsl/ir_optimization.h +++ b/src/glsl/ir_optimization.h @@ -36,6 +36,7 @@ #define LOG_TO_LOG2 0x10 #define MOD_TO_FRACT 0x20 #define INT_DIV_TO_MUL_RCP 0x40 +#define LRP_TO_ARITH 0x80 /** * \see class lower_packing_builtins_visitor |