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authorDave Airlie <airlied@redhat.com>2017-09-29 17:13:26 +1000
committerAlex Deucher <alexander.deucher@amd.com>2017-09-29 13:03:43 -0400
commitc233e91b0f3f7c9abc80eae491fa6507a24a8a32 (patch)
tree0d3caca7e98f32c8844e80d511f70324dca295b3 /drivers/gpu/drm/amd/display/include
parentdfd1e5ce673b8b2557d622dc99735e2d7ad5ba5b (diff)
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/include')
-rw-r--r--drivers/gpu/drm/amd/display/include/fixed31_32.h15
1 files changed, 13 insertions, 2 deletions
diff --git a/drivers/gpu/drm/amd/display/include/fixed31_32.h b/drivers/gpu/drm/amd/display/include/fixed31_32.h
index f0bc3c4afe02..2c9e2231ef06 100644
--- a/drivers/gpu/drm/amd/display/include/fixed31_32.h
+++ b/drivers/gpu/drm/amd/display/include/fixed31_32.h
@@ -28,6 +28,8 @@
#include "os_types.h"
+#define FIXED31_32_BITS_PER_FRACTIONAL_PART 32
+
/*
* @brief
* Arithmetic operations on real numbers
@@ -78,8 +80,17 @@ struct fixed31_32 dal_fixed31_32_from_fraction(
* @brief
* result = arg
*/
-struct fixed31_32 dal_fixed31_32_from_int(
- int64_t arg);
+struct fixed31_32 dal_fixed31_32_from_int_nonconst(int64_t arg);
+static inline struct fixed31_32 dal_fixed31_32_from_int(int64_t arg)
+{
+ if (__builtin_constant_p(arg)) {
+ struct fixed31_32 res;
+ BUILD_BUG_ON((LONG_MIN > arg) || (arg > LONG_MAX));
+ res.value = arg << FIXED31_32_BITS_PER_FRACTIONAL_PART;
+ return res;
+ } else
+ return dal_fixed31_32_from_int_nonconst(arg);
+}
/*
* @brief