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8261553: Efficient mask generation using BMI2 BZHI instruction

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Reviewed-by: redestad, neliasso
This commit is contained in:
Jatin Bhateja 2021-02-17 14:09:45 +00:00
parent a0658795cf
commit cb84539d56
6 changed files with 28 additions and 27 deletions
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7
src/hotspot/cpu/x86/assembler_x86.cpp
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@ -9173,6 +9173,13 @@ void Assembler::evpblendmq (XMMRegister dst, KRegister mask, XMMRegister nds, XM
emit_int16(0x64, (0xC0 | encode));
}
void Assembler::bzhiq(Register dst, Register src1, Register src2) {
assert(VM_Version::supports_bmi2(), "bit manipulation instructions not supported");
InstructionAttr attributes(AVX_128bit, /* vex_w */ true, /* legacy_mode */ true, /* no_mask_reg */ true, /* uses_vl */ false);
int encode = vex_prefix_and_encode(dst->encoding(), src2->encoding(), src1->encoding(), VEX_SIMD_NONE, VEX_OPCODE_0F_38, &attributes);
emit_int16((unsigned char)0xF5, (0xC0 | encode));
}
void Assembler::shlxl(Register dst, Register src1, Register src2) {
assert(VM_Version::supports_bmi2(), "");
InstructionAttr attributes(AVX_128bit, /* vex_w */ false, /* legacy_mode */ true, /* no_mask_reg */ true, /* uses_vl */ true);