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| author | Dominic Symes <dominic.symes@arm.com> | 2020-10-22 10:56:36 +0100 |
|---|---|---|
| committer | Dominic Symes <dominic.symes@arm.com> | 2020-10-28 16:42:06 +0000 |
| commit | f7179b5c3f42fa27835f286c78ca943772c867d6 (patch) | |
| tree | 4ba379472f169de93f3bc2f078a1706bff386ada /chapters/ewise_binary.adoc | |
| parent | 3da62dfa0da290dbbb39e411ca2187703429f916 (diff) | |
| download | specification-f7179b5c3f42fa27835f286c78ca943772c867d6.tar.gz | |
MUL: Add right shift on 32x32 multiply
The result of 32x32 elementwise multiply
exceeds the int32_t result type range.
This change adds a right scaling shift
argument to shift down the result.
Change-Id: I6ae17e6dc3fe342d052304533158ad2d0e7bb7be
Signed-off-by: Dominic Symes <dominic.symes@arm.com>
Diffstat (limited to 'chapters/ewise_binary.adoc')
| -rw-r--r-- | chapters/ewise_binary.adoc | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/chapters/ewise_binary.adoc b/chapters/ewise_binary.adoc index 4da63de..241ca32 100644 --- a/chapters/ewise_binary.adoc +++ b/chapters/ewise_binary.adoc @@ -479,6 +479,7 @@ Elementwise multiplication (Hadamard product) of input tensor 0 and input tensor |Input|in_t*|input1|shape1|Input tensor |Input|in_t*|input2|shape2|Input tensor with the same rank as Input 0 +|Attribute|uint6_t|shift|-|Result right shift (int32 data type only) |Output|out_t*|output|shape|Output tensor with broadcast shape if necessary |=== @@ -486,12 +487,17 @@ Elementwise multiplication (Hadamard product) of input tensor 0 and input tensor [source,c] ---- +assert(in_t==int32_t || shift==0); for_each (index in shape) { index1 = apply_broadcast(shape, shape1, index) index2 = apply_broadcast(shape, shape2, index) in_t value1 = tensor_read<in_t>(input1, shape1, index1) in_t value2 = tensor_read<in_t>(input2, shape2, index2) - in_t acc = value1 * value2 // takes low bits for int32_t + if (shift>0) { + out_t acc = apply_scale_32(value1, value2, shift) + } else { + out_t acc = value1 * value2; // low 32-bits of result for int32_t + } tensor_write<out_t>(output, shape, index, acc) } ---- |