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8308726: RISC-V: avoid unnecessary slli in the vectorized arraycopy stubs for bytes

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Reviewed-by: fyang, luhenry
This commit is contained in:
Antonios Printezis 2023-06-05 15:40:10 +00:00
parent 80232b7e75
commit 5cd8af7622
1 changed files with 8 additions and 2 deletions
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10
src/hotspot/cpu/riscv/stubGenerator_riscv.cpp
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@ -915,7 +915,10 @@ class StubGenerator: public StubCodeGenerator {
__ vlex_v(v0, src, sew);
__ sub(cnt, cnt, vl);
__ slli(vl, vl, (int)sew);
if (sew != Assembler::e8) {
// when sew == e8 (e.g., elem size is 1 byte), slli R, R, 0 is a nop and unnecessary
__ slli(vl, vl, sew);
}
__ add(src, src, vl);
__ vsex_v(v0, dst, sew);
@ -927,7 +930,10 @@ class StubGenerator: public StubCodeGenerator {
__ bind(loop_backward);
__ sub(t0, cnt, vl);
__ slli(t0, t0, sew);
if (sew != Assembler::e8) {
// when sew == e8 (e.g., elem size is 1 byte), slli R, R, 0 is a nop and unnecessary
__ slli(t0, t0, sew);
}
__ add(tmp1, s, t0);
__ vlex_v(v0, tmp1, sew);
__ add(tmp2, d, t0);