Hi, you can run d8 with --no-wasm-tier-up, then no tier-up to TurboFan will happen. There is also the chance that Liftoff cannot compile your function because it contains unsupported opcodes. You could check that with --trace-liftoff. Note that --trace-liftoff only works in a debug build of d8.
Cheers, Andreas On Thu, Jan 14, 2021 at 10:18 AM luy...@qq.com <luya...@qq.com> wrote: > Hi all, > I write a simple code to test wasm. > ``` > #include <wasm_simd128.h> > #include <iostream> > int fun(v128_t a,v128_t b) { > v128_t prod = wasm_i8x16_add(a, b); > return prod[0]; > } > int main() { > v128_t a = {1}; > v128_t b = {5}; > return fun(a,b); > } > ```` > test.wasm: file format wasm 0x1 > > Code Disassembly: > > 0000ea func[0] <__wasm_call_ctors>: > 0000eb: 0b | end > 0000ed func[1]: > 0000ee: 20 01 | local.get 1 > 0000f0: 20 00 | local.get 0 > 0000f2: fd 6e | i8x16.add > 0000f4: fd 1b 00 | i32x4.extract_lane 0 > 0000f7: 0b | end > ```` > --- WebAssembly code --- > index: 1 > kind: wasm function > compiler: TurboFan > Body (size = 288 = 264 + 24 padding) > Instructions (size = 256) > 0x377a710d80 0 00a00e13 li t3, 10 > 0x377a710d84 4 fe810113 addi sp, sp, -24 > 0x377a710d88 8 00113823 sd ra, 16(sp) > 0x377a710d8c c 00813423 sd fp, 8(sp) > 0x377a710d90 10 01c13023 sd t3, 0(sp) > 0x377a710d94 14 00810413 addi fp, sp, 8 > 0x377a710d98 18 ff810113 addi sp, sp, -8 > ``` > > When i run it by d8, i find wasm func[1] be compiled by TurboFan. > Is it possible to compile only with liftoff? > > -- > -- > v8-dev mailing list > v8-dev@googlegroups.com > http://groups.google.com/group/v8-dev > --- > You received this message because you are subscribed to the Google Groups > "v8-dev" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to v8-dev+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/v8-dev/219c754a-b8a5-404e-aac0-41cbfb8db6e6n%40googlegroups.com > <https://groups.google.com/d/msgid/v8-dev/219c754a-b8a5-404e-aac0-41cbfb8db6e6n%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- Andreas Haas Software Engineer ah...@google.com Google Germany GmbH Erika-Mann-Straße 33 80636 München Geschäftsführer: Paul Manicle, Halimah DeLaine Prado Registergericht und -nummer: Hamburg, HRB 86891 Sitz der Gesellschaft: Hamburg Diese E-Mail ist vertraulich. Falls sie diese fälschlicherweise erhalten haben sollten, leiten Sie diese bitte nicht an jemand anderes weiter, löschen Sie alle Kopien und Anhänge davon und lassen Sie mich bitte wissen, dass die E-Mail an die falsche Person gesendet wurde. This e-mail is confidential. If you received this communication by mistake, please don't forward it to anyone else, please erase all copies and attachments, and please let me know that it has gone to the wrong person. -- -- v8-dev mailing list v8-dev@googlegroups.com http://groups.google.com/group/v8-dev --- You received this message because you are subscribed to the Google Groups "v8-dev" group. To unsubscribe from this group and stop receiving emails from it, send an email to v8-dev+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/v8-dev/CAELSTvd5J%2BP9J5TtufVkqmmqi7%2BfYwu8utb8ZGcxJUbH_J6Nbg%40mail.gmail.com.