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i965: Mark URB reads as volatile.

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They can be affected by URB writes.

In the upcoming scalar TCS backend, this prevents read-modify-write
cycles from being broken by CSE removing reads.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Eduardo Lima Mitev <elima@igalia.com>
This commit is contained in:
Kenneth Graunke 2016-04-08 18:49:22 -07:00
parent 501bedffa6
commit 4e2d22c5a7
1 changed files with 3 additions and 0 deletions
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3
src/mesa/drivers/dri/i965/brw_shader.cpp
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@ -961,6 +961,9 @@ backend_instruction::is_volatile() const
case SHADER_OPCODE_UNTYPED_SURFACE_READ_LOGICAL:
case SHADER_OPCODE_TYPED_SURFACE_READ:
case SHADER_OPCODE_TYPED_SURFACE_READ_LOGICAL:
case SHADER_OPCODE_URB_READ_SIMD8:
case SHADER_OPCODE_URB_READ_SIMD8_PER_SLOT:
case VEC4_OPCODE_URB_READ:
return true;
default:
return false;