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Fix asm modifiers in add_dpbusd_epi32x2 implementations

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The accumulator should be an earlyclobber because it is written before
all input operands are read. Otherwise, the asm code computes a wrong
result if the accumulator shares a register with one of the other input
operands (which happens if we pass in the same expression for the
accumulator and the operand).

Closes https://github.com/official-stockfish/Stockfish/pull/4339

No functional change
This commit is contained in:
Sebastian Buchwald 2023-01-14 16:09:31 +01:00 • committed by Joost VandeVondele
parent 3d2381d76d
commit da5bcec481
1 changed files with 2 additions and 2 deletions
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4
src/nnue/layers/simd.h
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@ -153,7 +153,7 @@ namespace Stockfish::Simd {
asm(
"vpdpbusd %[b0], %[a0], %[acc]\n\t"
"vpdpbusd %[b1], %[a1], %[acc]\n\t"
: [acc]"+v"(acc)
: [acc]"+&v"(acc)
: [a0]"v"(a0), [b0]"vm"(b0), [a1]"v"(a1), [b1]"vm"(b1)
);
# else
@ -249,7 +249,7 @@ namespace Stockfish::Simd {
asm(
VNNI_PREFIX "vpdpbusd %[b0], %[a0], %[acc]\n\t"
VNNI_PREFIX "vpdpbusd %[b1], %[a1], %[acc]\n\t"
: [acc]"+v"(acc)
: [acc]"+&v"(acc)
: [a0]"v"(a0), [b0]"vm"(b0), [a1]"v"(a1), [b1]"vm"(b1)
);
# else