185708 2018-05-16 18:18:52 -0700 Baseline op_jtrue emits an insane amount of code 2018-06-02 16:03:03 -0700 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build All All RESOLVED FIXED InRadar P2 Normal --- 1 fpizlo ysuzuki commit-queue ews-watchlist keith_miller mark.lam msaboff saam sam webkit-bug-importer ysuzuki oldest_to_newest 1424565 0 fpizlo 2018-05-16 18:18:52 -0700 This is too much: [ 74] jtrue loc11, 21(->95) 0x7d2769f9871: mov -0x60(%rbp), %rax 0x7d2769f9875: mov %rax, %rsi 0x7d2769f9878: xor $0x6, %rsi 0x7d2769f987c: test $0xfffffffffffffffe, %rsi 0x7d2769f9883: jnz 0x7d2769f9899 0x7d2769f9889: cmp $0x7, %eax 0x7d2769f988c: setz %sil 0x7d2769f9890: movzx %sil, %esi 0x7d2769f9894: jmp 0x7d2769f994a 0x7d2769f9899: test %rax, %r14 0x7d2769f989c: jz 0x7d2769f98e1 0x7d2769f98a2: cmp %r14, %rax 0x7d2769f98a5: jb 0x7d2769f98ba 0x7d2769f98ab: test %eax, %eax 0x7d2769f98ad: setnz %sil 0x7d2769f98b1: movzx %sil, %esi 0x7d2769f98b5: jmp 0x7d2769f994a 0x7d2769f98ba: lea (%r14,%rax), %rsi 0x7d2769f98be: movq %rsi, %xmm0 0x7d2769f98c3: xorps %xmm1, %xmm1 0x7d2769f98c6: ucomisd %xmm1, %xmm0 0x7d2769f98ca: jz 0x7d2769f98da 0x7d2769f98d0: mov $0x1, %esi 0x7d2769f98d5: jmp 0x7d2769f994a 0x7d2769f98da: xor %esi, %esi 0x7d2769f98dc: jmp 0x7d2769f994a 0x7d2769f98e1: test %rax, %r15 0x7d2769f98e4: jnz 0x7d2769f9948 0x7d2769f98ea: cmp $0x1, 0x5(%rax) 0x7d2769f98ee: jnz 0x7d2769f9906 0x7d2769f98f4: mov 0x8(%rax), %esi 0x7d2769f98f7: test %esi, %esi 0x7d2769f98f9: setnz %sil 0x7d2769f98fd: movzx %sil, %esi 0x7d2769f9901: jmp 0x7d2769f994a 0x7d2769f9906: test $0x1, 0x6(%rax) 0x7d2769f990a: jz 0x7d2769f993e 0x7d2769f9910: mov (%rax), %esi 0x7d2769f9912: mov $0x10c5000e8, %rdx 0x7d2769f991c: mov (%rdx), %rdx 0x7d2769f991f: mov (%rdx,%rsi,8), %rsi 0x7d2769f9923: mov $0x10c9dc000, %rdx 0x7d2769f992d: cmp %rdx, 0x18(%rsi) 0x7d2769f9931: jnz 0x7d2769f993e 0x7d2769f9937: xor %esi, %esi 0x7d2769f9939: jmp 0x7d2769f994a 0x7d2769f993e: mov $0x1, %esi 0x7d2769f9943: jmp 0x7d2769f994a 0x7d2769f9948: xor %esi, %esi 0x7d2769f994a: test %esi, %esi 0x7d2769f994c: jnz 0x7d2769f99e6 1429194 1 341752 ysuzuki 2018-06-01 05:33:02 -0700 Created attachment 341752 Patch 1429195 2 ews-watchlist 2018-06-01 05:35:16 -0700 Attachment 341752 did not pass style-queue: ERROR: Source/JavaScriptCore/jit/AssemblyHelpers.h:1761: The parameter name "value" adds no information, so it should be removed. [readability/parameter_name] [5] Total errors found: 1 in 12 files If any of these errors are false positives, please file a bug against check-webkit-style. 1429197 3 341752 ysuzuki 2018-06-01 05:39:02 -0700 Comment on attachment 341752 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=341752&action=review > Source/JavaScriptCore/ChangeLog:104 > + [ 12] jtrue arg1, 6(->18) > + 0x7f6c8710156c: mov 0x30(%rbp), %rax > + 0x7f6c87101570: test %rax, %r15 > + 0x7f6c87101573: jnz 0x7f6c871015c8 > + 0x7f6c87101579: cmp $0x1, 0x5(%rax) > + 0x7f6c8710157d: jnz 0x7f6c87101592 > + 0x7f6c87101583: cmp $0x0, 0x8(%rax) > + 0x7f6c87101587: jnz 0x7f6c87101623 > + 0x7f6c8710158d: jmp 0x7f6c87101615 > + 0x7f6c87101592: test $0x1, 0x6(%rax) > + 0x7f6c87101596: jz 0x7f6c87101623 > + 0x7f6c8710159c: mov (%rax), %esi > + 0x7f6c8710159e: mov $0x7f6c86f000e0, %rdx > + 0x7f6c871015a8: mov (%rdx), %rdx > + 0x7f6c871015ab: mov (%rdx,%rsi,8), %rsi > + 0x7f6c871015af: mov $0x7f6c867e0000, %rdx > + 0x7f6c871015b9: cmp %rdx, 0x18(%rsi) > + 0x7f6c871015bd: jnz 0x7f6c87101623 > + 0x7f6c871015c3: jmp 0x7f6c87101615 > + 0x7f6c871015c8: cmp %r14, %rax > + 0x7f6c871015cb: jb 0x7f6c871015de > + 0x7f6c871015d1: test %eax, %eax > + 0x7f6c871015d3: jnz 0x7f6c87101623 > + 0x7f6c871015d9: jmp 0x7f6c87101615 > + 0x7f6c871015de: test %rax, %r14 > + 0x7f6c871015e1: jz 0x7f6c87101602 > + 0x7f6c871015e7: lea (%r14,%rax), %rsi > + 0x7f6c871015eb: movq %rsi, %xmm0 > + 0x7f6c871015f0: xorps %xmm1, %xmm1 > + 0x7f6c871015f3: ucomisd %xmm1, %xmm0 > + 0x7f6c871015f7: jz 0x7f6c87101615 > + 0x7f6c871015fd: jmp 0x7f6c87101623 > + 0x7f6c87101602: mov $0x7, %r11 > + 0x7f6c8710160c: cmp %r11, %rax > + 0x7f6c8710160f: jz 0x7f6c87101623 We can reduce this further by, 1. Extracting this as a stub routine and call it from baseline, 2. Split it into fast path / slow path 3. IC But I think this is a good first patch towards reducing this size. 1429593 4 ysuzuki 2018-06-02 14:13:52 -0700 Committed r232444: <https://trac.webkit.org/changeset/232444> 1429594 5 webkit-bug-importer 2018-06-02 14:21:19 -0700 <rdar://problem/40750479> 341752 2018-06-01 05:33:02 -0700 2018-06-02 14:12:08 -0700 Patch bug-185708-20180601213301.patch text/plain 28069 ysuzuki U3VidmVyc2lvbiBSZXZpc2lvbjogMjMyMzkxCmRpZmYgLS1naXQgYS9Tb3VyY2UvSmF2YVNjcmlw dENvcmUvQ2hhbmdlTG9nIGIvU291cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwppbmRleCA1 MjZjMzFlMDY0M2UyNGVhOTRjYTAwNWUzYzc3ZTlkNjJmMTdhY2VmLi45MjFjNmI2ZDZhZWI5MWRm OWI3NTQ2NmYyYWU1ZDgwNzYwNDRiZDU5IDEwMDY0NAotLS0gYS9Tb3VyY2UvSmF2YVNjcmlwdENv cmUvQ2hhbmdlTG9nCisrKyBiL1NvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKQEAgLTEs MyArMSwxMjggQEAKKzIwMTgtMDYtMDEgIFl1c3VrZSBTdXp1a2kgIDx1dGF0YW5lLnRlYUBnbWFp bC5jb20+CisKKyAgICAgICAgQmFzZWxpbmUgb3BfanRydWUgZW1pdHMgYW4gaW5zYW5lIGFtb3Vu dCBvZiBjb2RlCisgICAgICAgIGh0dHBzOi8vYnVncy53ZWJraXQub3JnL3Nob3dfYnVnLmNnaT9p 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