On Sun, 5 Nov 2023 12:58:33 GMT, Jatin Bhateja <jbhat...@openjdk.org> wrote:
>> src/hotspot/cpu/x86/x86.ad line 4074: >> >>> 4072: BasicType elem_bt = Matcher::vector_element_basic_type(this); >>> 4073: assert(!is_subword_type(elem_bt), "sanity"); // T_INT, T_LONG, >>> T_FLOAT, T_DOUBLE >>> 4074: __ vpcmpeqd($mask$$XMMRegister, $mask$$XMMRegister, >>> $mask$$XMMRegister, vlen_enc); >> >> vpcmpeqd is expensive instruction as compared to movdqu and also unrelated >> to subword type support. > > compare instruction here does not access a memory operand, hence its cheaper > compared to memory loads. compare instruction here does not access a memory operand, hence its cheaper compared to memory loads. ------------- PR Review Comment: https://git.openjdk.org/jdk/pull/16354#discussion_r1382571224
