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| author | Eric Kunze <eric.kunze@arm.com> | 2023-08-31 16:14:05 -0700 |
|---|---|---|
| committer | Eric Kunze <eric.kunze@arm.com> | 2023-09-11 21:59:25 +0000 |
| commit | fe2ac6d7b9cbc7de4befa128a1ac514712030e74 (patch) | |
| tree | 98d36e9c39a4aa2986dbbb3d71b10ff744bf1a3b | |
| parent | b203512ca3583fd0968ea281aedec2a840b6e58b (diff) | |
| download | specification-fe2ac6d7b9cbc7de4befa128a1ac514712030e74.tar.gz | |
Add integer divide with floor for coordinate calculation
Define idiv_floor to give equivalent behavior to the floating-point
floor function for image coordinate calculation.
Change-Id: Id6268794b1e3ce5cc1114bda74dd06b892457a8e
Signed-off-by: Eric Kunze <eric.kunze@arm.com>
| -rw-r--r-- | chapters/image.adoc | 4 | ||||
| -rw-r--r-- | chapters/pseudocode.adoc | 10 |
2 files changed, 12 insertions, 2 deletions
diff --git a/chapters/image.adoc b/chapters/image.adoc index da839f8..59e5ddf 100644 --- a/chapters/image.adoc +++ b/chapters/image.adoc @@ -85,8 +85,8 @@ for_each(0 <= n < N, 0 <= oy < OH, 0 <= ox < OW; 0 <= c < C) { int32_t y = oy * scale_y_d + offset_y; int32_t x = ox * scale_x_d + offset_x; - int16_t iy = floor(y / scale_y_n); - int16_t ix = floor(x / scale_x_n); + int16_t iy = idiv_floor(y, scale_y_n); + int16_t ix = idiv_floor(x, scale_x_n); int16_t ry = y - iy * scale_y_n; // (y % scale_y_n) int16_t rx = x - ix * scale_x_n; // (x % scale_x_n) diff --git a/chapters/pseudocode.adoc b/chapters/pseudocode.adoc index 55c35d4..d674c9c 100644 --- a/chapters/pseudocode.adoc +++ b/chapters/pseudocode.adoc @@ -477,6 +477,16 @@ int32_t idiv_check(int32_t input1, int32_t input2) { return input1 / input2; // exact quotient without rounding } +// perform an integer division with rounding towards minus infinity + +int32_t idiv_floor(int32_t input1, int32_t input2) { + int32_t rval = input1 / input2; + if (rval * input2 > input1) { + rval--; + } + return rval; +} + int32_t length(in_t input) return number of elements in input list |