brw_fs_nir has only seen scalar bools so far, thanks to vector splitting,
and the ralloc of in glsl_to_nir.cpp will *usually* get you a 0-filled
chunk of memory, so reading too large of a value will usually get you the
right bool value.  But once we start doing vector bools in a few commits,
we end up getting bad values.
---
 src/glsl/nir/nir_lower_vars_to_ssa.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/glsl/nir/nir_lower_vars_to_ssa.c 
b/src/glsl/nir/nir_lower_vars_to_ssa.c
index 089f0d5..03967e3 100644
--- a/src/glsl/nir/nir_lower_vars_to_ssa.c
+++ b/src/glsl/nir/nir_lower_vars_to_ssa.c
@@ -600,7 +600,7 @@ get_const_initializer_load(const nir_deref_var *deref,
          load->value.u[i] = constant->value.u[matrix_offset + i];
          break;
       case GLSL_TYPE_BOOL:
-         load->value.u[i] = constant->value.u[matrix_offset + i] ?
+         load->value.u[i] = constant->value.b[matrix_offset + i] ?
                              NIR_TRUE : NIR_FALSE;
          break;
       default:
-- 
2.1.3

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