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8279676: Dubious YMM register clearing in x86_64 arraycopy stubs

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Reviewed-by: kvn, vlivanov, neliasso
This commit is contained in:
Aleksey Shipilev 2022-01-12 08:32:08 +00:00
parent 4f0b65023f
commit 525b20fce0
1 changed files with 0 additions and 10 deletions
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10
src/hotspot/cpu/x86/stubGenerator_x86_64.cpp
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@ -1221,11 +1221,6 @@ class StubGenerator: public StubCodeGenerator {
} }
__ addptr(qword_count, 4); __ addptr(qword_count, 4);
__ BIND(L_end); __ BIND(L_end);
if (UseAVX >= 2) {
// clean upper bits of YMM registers
__ vpxor(xmm0, xmm0);
__ vpxor(xmm1, xmm1);
}
} else { } else {
// Copy 32-bytes per iteration // Copy 32-bytes per iteration
__ BIND(L_loop); __ BIND(L_loop);
@ -1299,11 +1294,6 @@ class StubGenerator: public StubCodeGenerator {
} }
__ subptr(qword_count, 4); __ subptr(qword_count, 4);
__ BIND(L_end); __ BIND(L_end);
if (UseAVX >= 2) {
// clean upper bits of YMM registers
__ vpxor(xmm0, xmm0);
__ vpxor(xmm1, xmm1);
}
} else { } else {
// Copy 32-bytes per iteration // Copy 32-bytes per iteration
__ BIND(L_loop); __ BIND(L_loop);