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authorKristian Høgsberg <[email protected]>2014-07-07 23:32:35 -0700
committerKristian Høgsberg <[email protected]>2014-07-07 23:39:40 -0700
commitbbefb15e01e1c16af69646898918982ae00f8c92 (patch)
treed1dcbd24ea77be6fe454f31fb710b9224e5e9d69 /src/mesa/main/pack.c
parent8aa34dc9cb1f4b1b17e49da98e54066832afc98e (diff)
i965: Extend compute-to-mrf pass to understand blocks of MOVs
The current compute-to-mrf pass doesn't handle blocks of MOVs. Shaders that end with a texture fetch follwed by an fb write are left like this: 0x00000000: pln(8) g6<1>F g4<0,1,0>F g2<8,8,1>F { align1 WE_normal 1Q compacted }; 0x00000008: pln(8) g7<1>F g4.4<0,1,0>F g2<8,8,1>F { align1 WE_normal 1Q compacted }; 0x00000010: send(8) g2<1>UW g6<8,8,1>F sampler (1, 0, 0, 1) mlen 2 rlen 4 { align1 WE_normal 1Q }; 0x00000020: mov(8) g113<1>F g2<8,8,1>F { align1 WE_normal 1Q compacted }; 0x00000028: mov(8) g114<1>F g3<8,8,1>F { align1 WE_normal 1Q compacted }; 0x00000030: mov(8) g115<1>F g4<8,8,1>F { align1 WE_normal 1Q compacted }; 0x00000038: mov(8) g116<1>F g5<8,8,1>F { align1 WE_normal 1Q compacted }; 0x00000040: sendc(8) null g113<8,8,1>F render ( RT write, 0, 4, 12) mlen 4 rlen 0 { align1 WE_normal 1Q EOT }; This patch lets compute-to-mrf recognize blocks of MOVs and match them to instructions (typically SEND) that writes multiple registers. With this, the above shader becomes: 0x00000000: pln(8) g6<1>F g4<0,1,0>F g2<8,8,1>F { align1 WE_normal 1Q compacted }; 0x00000008: pln(8) g7<1>F g4.4<0,1,0>F g2<8,8,1>F { align1 WE_normal 1Q compacted }; 0x00000010: send(8) g113<1>UW g6<8,8,1>F sampler (1, 0, 0, 1) mlen 2 rlen 4 { align1 WE_normal 1Q }; 0x00000020: sendc(8) null g113<8,8,1>F render ( RT write, 0, 20, 12) mlen 4 rlen 0 { align1 WE_normal 1Q EOT }; which is the bulk of the shader db results: total instructions in shared programs: 987040 -> 986720 (-0.03%) instructions in affected programs: 844 -> 524 (-37.91%) GAINED: 0 LOST: 0 The optimization also applies to MRT shaders that write the same color value to multiple RTs, in which case we can eliminate four MOVs in a similar fashion. See fbo-drawbuffers2-blend in piglit for an example. No measurable performance impact. No piglit regressions. Signed-off-by: Kristian Høgsberg <[email protected]>
Diffstat (limited to 'src/mesa/main/pack.c')
0 files changed, 0 insertions, 0 deletions