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pan/bi: Add Valhall's special FMA_RSCALE instructions

Browse source 
Like Bifrost, but exposed as separate physical instructions.

Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/13802>
This commit is contained in:
Alyssa Rosenzweig 2021-11-15 18:19:57 -05:00 • committed by Marge Bot
parent aee819d54c
commit 58b65a340c
1 changed files with 47 additions and 0 deletions
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47
src/panfrost/bifrost/valhall/ISA.xml
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@ -1733,4 +1733,51 @@
<src>D</src>
</ins>
<ins name="FMA_RSCALE_N.f32" title="Fused floating-point multiply add with exponent bias and zero override" dests="1" opcode="0x161" unit="FMA">
<desc>
First calculates $A \cdot B + C$ and then biases the exponent by D. If $A
= 0$ or $B = 0$, the multiply $A \cdot B$ is treated as zero even if an
ordinary multiply would return NaN. Used in special transcendental
function sequences. It should not be used for general code as its special
case handling differs from two back-to-back `FMA.f32` operations.
Equivalent to `FMA.f32` back-to-back with `RSCALE.f32`
</desc>
<clamp/>
<src absneg="true">A</src>
<src absneg="true">B</src>
<src absneg="true">C</src>
<src>D</src>
</ins>
<ins name="FMA_RSCALE_LEFT.f32" title="Fused floating-point multiply add with exponent bias and asymmetric zero handling" dests="1" opcode="0x162" unit="FMA">
<desc>
First calculates $A \cdot B + C$ and then biases the exponent by D. If $A
= 0$ or $B = 0$, the multiply is treated as $A$ even if an
ordinary multiply would return NaN. Used in special transcendental
function sequences. It should not be used for general code as its special
case handling differs from two back-to-back `FMA.f32` operations.
Equivalent to `FMA.f32` back-to-back with `RSCALE.f32`
</desc>
<clamp/>
<src absneg="true">A</src>
<src absneg="true">B</src>
<src absneg="true">C</src>
<src>D</src>
</ins>
<ins name="FMA_RSCALE_SCALE16.f32" title="Fused floating-point multiply add with 16-bit exponent bias" dests="1" opcode="0x163" unit="FMA">
<desc>
First calculates $A \cdot B + C$ and then biases the exponent by D,
interpreted as a 16-bit value. Used in special transcendental function
sequences. It should not be used for general code as its special case
handling differs from two back-to-back `FMA.f32` operations. Equivalent
to `FMA.f32` back-to-back with `RSCALE.f32`
</desc>
<clamp/>
<src absneg="true">A</src>
<src absneg="true">B</src>
<src absneg="true">C</src>
<src>D</src>
</ins>
</valhall>