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drm/amd/display: Use macro for isnan check

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In code provided by HW teams we do a NaN check on floats
by comparing the number against itself. This confuses most
people including myself. Macro it out to make it self-explanatory.

Don't do a NaN check for int.

v2: parantheses around 'number' expression

Signed-off-by: Harry Wentland <harry.wentland@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Harry Wentland 2017-11-29 10:16:51 -05:00 committed by Alex Deucher
parent fdc72e7df9
commit 3f4e3a282e
1 changed files with 8 additions and 10 deletions
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18
drivers/gpu/drm/amd/display/dc/calcs/dcn_calc_math.c
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@ -25,37 +25,35 @@
#include "dcn_calc_math.h"
#define isNaN(number) ((number) != (number))
float dcn_bw_mod(const float arg1, const float arg2)
{
if (arg1 != arg1)
if (isNaN(arg1))
return arg2;
if (arg2 != arg2)
if (isNaN(arg2))
return arg1;
return arg1 - arg1 * ((int) (arg1 / arg2));
}
float dcn_bw_min2(const float arg1, const float arg2)
{
if (arg1 != arg1)
if (isNaN(arg1))
return arg2;
if (arg2 != arg2)
if (isNaN(arg2))
return arg1;
return arg1 < arg2 ? arg1 : arg2;
}
unsigned int dcn_bw_max(const unsigned int arg1, const unsigned int arg2)
{
if (arg1 != arg1)
return arg2;
if (arg2 != arg2)
return arg1;
return arg1 > arg2 ? arg1 : arg2;
}
float dcn_bw_max2(const float arg1, const float arg2)
{
if (arg1 != arg1)
if (isNaN(arg1))
return arg2;
if (arg2 != arg2)
if (isNaN(arg2))
return arg1;
return arg1 > arg2 ? arg1 : arg2;
}