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mesa/format_utils: Add src_bits == dst_bits cases to unorm_to_unorm

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This better ensures that the src_bits == dst_bits case gets optimized away.

Reviewed-by: Neil Roberts <neil@linux.intel.com>
Reviewed-by: Roland Scheidegger <sroland@vmware.com>
This commit is contained in:
Jason Ekstrand 2015-08-09 22:03:00 -07:00
parent 7e5d56394b
commit 9901aeb1c7
1 changed files with 3 additions and 1 deletions
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4
src/mesa/main/format_utils.h
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@ -99,7 +99,7 @@ _mesa_unorm_to_unorm(unsigned x, unsigned src_bits, unsigned dst_bits)
{
if (src_bits < dst_bits) {
return EXTEND_NORMALIZED_INT(x, src_bits, dst_bits);
} else {
} else if (src_bits > dst_bits) {
unsigned src_half = (1 << (src_bits - 1)) - 1;
if (src_bits + dst_bits > sizeof(x) * 8) {
@ -109,6 +109,8 @@ _mesa_unorm_to_unorm(unsigned x, unsigned src_bits, unsigned dst_bits)
} else {
return (x * MAX_UINT(dst_bits) + src_half) / MAX_UINT(src_bits);
}
} else {
return x;
}
}