diff options
| author | Dave Airlie <airlied@redhat.com> | 2017-09-29 17:13:26 +1000 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2017-09-29 13:03:43 -0400 |
| commit | c233e91b0f3f7c9abc80eae491fa6507a24a8a32 (patch) | |
| tree | 0d3caca7e98f32c8844e80d511f70324dca295b3 /drivers/gpu/drm/amd/display/dc/basics/fixpt31_32.c | |
| parent | dfd1e5ce673b8b2557d622dc99735e2d7ad5ba5b (diff) | |
| download | lwn-c233e91b0f3f7c9abc80eae491fa6507a24a8a32.tar.gz lwn-c233e91b0f3f7c9abc80eae491fa6507a24a8a32.zip | |
amdgpu/dc: use the builtin constant p trick on the 31/32 fixed point.
This only gets us 100 bytes, but may as well be consistent.
Signed-off-by: Dave Airlie <airlied@redhat.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/display/dc/basics/fixpt31_32.c')
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/basics/fixpt31_32.c | 22 |
1 files changed, 10 insertions, 12 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/basics/fixpt31_32.c b/drivers/gpu/drm/amd/display/dc/basics/fixpt31_32.c index 578691cf8725..1764a33c8350 100644 --- a/drivers/gpu/drm/amd/display/dc/basics/fixpt31_32.c +++ b/drivers/gpu/drm/amd/display/dc/basics/fixpt31_32.c @@ -54,14 +54,12 @@ static inline uint64_t complete_integer_division_u64( return result; } -#define BITS_PER_FRACTIONAL_PART \ - 32 #define FRACTIONAL_PART_MASK \ - ((1ULL << BITS_PER_FRACTIONAL_PART) - 1) + ((1ULL << FIXED31_32_BITS_PER_FRACTIONAL_PART) - 1) #define GET_INTEGER_PART(x) \ - ((x) >> BITS_PER_FRACTIONAL_PART) + ((x) >> FIXED31_32_BITS_PER_FRACTIONAL_PART) #define GET_FRACTIONAL_PART(x) \ (FRACTIONAL_PART_MASK & (x)) @@ -89,7 +87,7 @@ struct fixed31_32 dal_fixed31_32_from_fraction( /* determine fractional part */ { - uint32_t i = BITS_PER_FRACTIONAL_PART; + uint32_t i = FIXED31_32_BITS_PER_FRACTIONAL_PART; do { remainder <<= 1; @@ -120,14 +118,14 @@ struct fixed31_32 dal_fixed31_32_from_fraction( return res; } -struct fixed31_32 dal_fixed31_32_from_int( +struct fixed31_32 dal_fixed31_32_from_int_nonconst( int64_t arg) { struct fixed31_32 res; ASSERT((LONG_MIN <= arg) && (arg <= LONG_MAX)); - res.value = arg << BITS_PER_FRACTIONAL_PART; + res.value = arg << FIXED31_32_BITS_PER_FRACTIONAL_PART; return res; } @@ -198,7 +196,7 @@ struct fixed31_32 dal_fixed31_32_mul( ASSERT(res.value <= LONG_MAX); - res.value <<= BITS_PER_FRACTIONAL_PART; + res.value <<= FIXED31_32_BITS_PER_FRACTIONAL_PART; tmp = arg1_int * arg2_fra; @@ -214,7 +212,7 @@ struct fixed31_32 dal_fixed31_32_mul( tmp = arg1_fra * arg2_fra; - tmp = (tmp >> BITS_PER_FRACTIONAL_PART) + + tmp = (tmp >> FIXED31_32_BITS_PER_FRACTIONAL_PART) + (tmp >= (uint64_t)dal_fixed31_32_half.value); ASSERT(tmp <= (uint64_t)(LLONG_MAX - res.value)); @@ -244,7 +242,7 @@ struct fixed31_32 dal_fixed31_32_sqr( ASSERT(res.value <= LONG_MAX); - res.value <<= BITS_PER_FRACTIONAL_PART; + res.value <<= FIXED31_32_BITS_PER_FRACTIONAL_PART; tmp = arg_int * arg_fra; @@ -258,7 +256,7 @@ struct fixed31_32 dal_fixed31_32_sqr( tmp = arg_fra * arg_fra; - tmp = (tmp >> BITS_PER_FRACTIONAL_PART) + + tmp = (tmp >> FIXED31_32_BITS_PER_FRACTIONAL_PART) + (tmp >= (uint64_t)dal_fixed31_32_half.value); ASSERT(tmp <= (uint64_t)(LLONG_MAX - res.value)); @@ -560,7 +558,7 @@ static inline uint32_t ux_dy( /* 4. make space for fractional part to be filled in after integer */ result <<= fractional_bits; /* 5. shrink fixed point fractional part to of fractional_bits width*/ - fractional_part >>= BITS_PER_FRACTIONAL_PART - fractional_bits; + fractional_part >>= FIXED31_32_BITS_PER_FRACTIONAL_PART - fractional_bits; /* 6. merge the result */ return result | fractional_part; } |