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vc4: enable lower_isign for VC4

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Since 1e7d82c881 ("nir/algebraic: always lower idiv
to shifts if bitops are allowed") idiv is lowered and
generates a isign operation.

VC4 HW doesn't support isign and lower_isign wasn't enabled.
Enabling it fixes the regressions caused by this new
optimization on piglit tests shaders/glsl-fs-loop-nested.

Fixes: 1e7d82c881 ("nir/algebraic: always lower idiv to shifts if bitops are allowed")
Reviewed-by: Alejandro Piñeiro <apinheiro@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7089>
This commit is contained in:
Jose Maria Casanova Crespo 2020-10-10 12:19:39 +01:00
parent b7d16adcbe
commit 7346933fc8
1 changed files with 1 additions and 0 deletions
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src/gallium/drivers/vc4/vc4_program.c
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@ -2193,6 +2193,7 @@ static const nir_shader_compiler_options nir_options = {
.lower_to_scalar = true,
.lower_umax = true,
.lower_umin = true,
.lower_isign = true,
.max_unroll_iterations = 32,
};