util: Move util_is_power_of_two to bitscan.h and rename to util_is_power_of_two_or_zero

The new name make the zero-input behavior more obvious.  The next
patch adds a new function with different zero-input behavior.

Signed-off-by: Ian Romanick <[email protected]>
Suggested-by: Matt Turner <[email protected]>
Reviewed-by: Alejandro Piñeiro <[email protected]>

1 files changed, 2 insertions, 2 deletions

diff --git a/src/broadcom/compiler/nir_to_vir.c b/src/broadcom/compiler/nir_to_vir.c
index 51710001784..d6c2d1902b6 100644
--- a/src/broadcom/compiler/nir_to_vir.c
+++ b/src/broadcom/compiler/nir_to_vir.c
@@ -233,7 +233,7 @@ static struct qreg
 ntq_get_alu_src(struct v3d_compile *c, nir_alu_instr *instr,
                 unsigned src)
 {
-        assert(util_is_power_of_two(instr->dest.write_mask));
+        assert(util_is_power_of_two_or_zero(instr->dest.write_mask));
         unsigned chan = ffs(instr->dest.write_mask) - 1;
         struct qreg r = ntq_get_src(c, instr->src[src].src,
                                     instr->src[src].swizzle[chan]);
@@ -862,7 +862,7 @@ ntq_emit_alu(struct v3d_compile *c, nir_alu_instr *instr)
         /* We have a scalar result, so the instruction should only have a
          * single channel written to.
          */
-        assert(util_is_power_of_two(instr->dest.write_mask));
+        assert(util_is_power_of_two_or_zero(instr->dest.write_mask));
         ntq_store_dest(c, &instr->dest.dest,
                        ffs(instr->dest.write_mask) - 1, result);
 }