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i965/vec4: unit test for copy propagation and writemask

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This unit test demonstrates a subtle bug fixed by
4ddf51db6a.

Signed-off-by: Chia-I Wu <olv@lunarg.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Chia-I Wu 2014-04-14 21:52:34 +08:00
parent 6c2d815d64
commit 88b887faa9
1 changed files with 30 additions and 0 deletions
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30
src/mesa/drivers/dri/i965/test_vec4_copy_propagation.cpp
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@ -154,3 +154,33 @@ TEST_F(copy_propagation_test, test_swizzle_swizzle)
SWIZZLE_X,
SWIZZLE_Y));
}
TEST_F(copy_propagation_test, test_swizzle_writemask)
{
dst_reg a = dst_reg(v, glsl_type::vec4_type);
dst_reg b = dst_reg(v, glsl_type::vec4_type);
dst_reg c = dst_reg(v, glsl_type::vec4_type);
v->emit(v->MOV(b, swizzle(src_reg(a), BRW_SWIZZLE4(SWIZZLE_X,
SWIZZLE_Y,
SWIZZLE_X,
SWIZZLE_Z))));
v->emit(v->MOV(writemask(a, WRITEMASK_XYZ), src_reg(1.0f)));
vec4_instruction *test_mov =
v->MOV(c, swizzle(src_reg(b), BRW_SWIZZLE4(SWIZZLE_W,
SWIZZLE_W,
SWIZZLE_W,
SWIZZLE_W)));
v->emit(test_mov);
copy_propagation(v);
/* should not copy propagate */
EXPECT_EQ(test_mov->src[0].reg, b.reg);
EXPECT_EQ(test_mov->src[0].swizzle, BRW_SWIZZLE4(SWIZZLE_W,
SWIZZLE_W,
SWIZZLE_W,
SWIZZLE_W));
}