Turns out the "new" assembler that uses mesa's opcode emission hits the
path that automatically transforms MRF registers into GRF ones in the
exa_wm_src_projective shader.
The diff with the new assembler is:
$ intel-gen4disasm -g7 -
- { 0x00600041, 0x208077be, 0x008d03c0, 0x008d0180 },
+ { 0x00600041, 0x2e8077bd, 0x008d03c0, 0x008d0180 },
mul(8) m4<1>F g30<8,8,1>F g12<8,8,1>F { align1 };
mul(8) g116<1>F g30<8,8,1>F g12<8,8,1>F { align1 };
Of course, message registers are no more in gen7, so the shader is
trying to do something shaddy (ahem!).
Instead of using m4, let's make exa_wm_src_projective use g68 for v (aka
vl) which makes sense since:
1/ vh is g69
2/ exa_wm_src_affine uses g68 for vl already
This commit changes the generated assembly, here's the decoded diff:
$ intel-gen4disasm -g7 -
- { 0x00600041, 0x208077be, 0x008d03c0, 0x008d0180 },
+ { 0x00600041, 0x288077bd, 0x008d03c0, 0x008d0180 },
mul(8) m4<1>F g30<8,8,1>F g12<8,8,1>F { align1 };
mul(8) g68<1>F g30<8,8,1>F g12<8,8,1>F { align1 };
Cc: Kenneth Graunke <kenneth at whitecape.org>
Reported-by: Xiang, Haihao <haihao.xiang at intel.com>
Signed-off-by: Damien Lespiau <damien.lespiau at intel.com>
---
src/render_program/exa_wm_src_projective.g7a | 4 ++--
src/render_program/exa_wm_src_projective.g7b | 2 +-
2 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/src/render_program/exa_wm_src_projective.g7a b/src/render_program/exa_wm_src_projective.g7a
index 9fd495c..465e99d 100644
--- a/src/render_program/exa_wm_src_projective.g7a
+++ b/src/render_program/exa_wm_src_projective.g7a
@@ -30,8 +30,8 @@ include(`exa_wm.g4i')
define(`u', `g66')
define(`ul', `g66')
define(`uh', `g67')
-define(`v', `src_v')
-define(`vl', `src_v')
+define(`v', `g68')
+define(`vl', `g68')
define(`vh', `g69')
define(`w', `src_w')
define(`wl', `src_w_0')
diff --git a/src/render_program/exa_wm_src_projective.g7b b/src/render_program/exa_wm_src_projective.g7b
index 73727ff..cadcaa3 100644
--- a/src/render_program/exa_wm_src_projective.g7b
+++ b/src/render_program/exa_wm_src_projective.g7b
@@ -8,5 +8,5 @@
{ 0x00600041, 0x286077bd, 0x008d03e0, 0x008d01a0 },
{ 0x0060005a, 0x23c077bd, 0x000000d0, 0x008d0040 },
{ 0x0060005a, 0x23e077bd, 0x000000d0, 0x008d0080 },
- { 0x00600041, 0x208077be, 0x008d03c0, 0x008d0180 },
+ { 0x00600041, 0x288077bd, 0x008d03c0, 0x008d0180 },
{ 0x00600041, 0x28a077bd, 0x008d03e0, 0x008d01a0 },
--
1.7.7.5
