194222 2019-02-04 09:47:10 -0800 Reduce the number of iterations in B3ReduceStrength 2019-02-09 14:34:21 -0800 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build Unspecified Unspecified NEW P2 Normal --- 194475 1 rmorisset rmorisset oldest_to_newest 1501865 0 rmorisset 2019-02-04 09:47:10 -0800 B3ReduceStrength repeats a sequence of optimizations to a fixpoint. One of these optimizations is a peephole optimizer, which currently does not revisit any node it adds or changes. So if it must be called 3 times to fully reduce an expression, the whole sequence of optimizations will be repeated 3 times (at least), even if the rest of the function was fully optimized in one pass. I'll try to make the peephole optimizer apply repeatedly whenever it adds/changes nodes, and measure how much it improves FTL compile-time. 1503387 1 rmorisset 2019-02-06 11:02:26 -0800 Here are some quick numbers for ARES-6: 1 62 2 351 3 997 4 848 5 108 6 18 Meaning that B3ReduceStrength runs only two iterations in 351 cases, runs 4 iterations in 848 cases, etc.. If nothing is done, I expect this to get worse as B3ReduceStrength is taught more optimizations (e.g. https://bugs.webkit.org/show_bug.cgi?id=194081). Since the entire pass is repeated on each iteration, reducing this number of iterations should directly improve B3 compile time. 1503564 2 361360 rmorisset 2019-02-06 18:31:51 -0800 Created attachment 361360 WIP Only supports Mul with the new architecture so far. Is currently recursive, I may have to rearchitect it into an iterative approach if it causes stack issues. 1503566 3 361361 rmorisset 2019-02-06 18:45:47 -0800 Created attachment 361361 WIP Simpler, and now most recursive calls are tail-recursive which should alleviate the stack concerns. 1503956 4 361452 rmorisset 2019-02-07 14:52:27 -0800 Created attachment 361452 WIP_Arith Now supports Add/Sub/Neg/Mul/Div/UDiv/Mod/UMod. Also now takes a kind as argument instead of an opcode, to correctly deal with chill operations. Finally I commented out an optimization from https://bugs.webkit.org/show_bug.cgi?id=194250 that seems buggy while I investigate. 1504000 5 361467 rmorisset 2019-02-07 16:25:49 -0800 Created attachment 361467 WIP_Arith+Shifts+FP Add shifts, rotations, abs, ceil, floor. 1504066 6 361480 rmorisset 2019-02-07 18:01:47 -0800 Created attachment 361480 WIP_More Adds conversions, select, equal. 1504629 7 rmorisset 2019-02-09 14:19:08 -0800 On further investigation, it appears that the peephole optimizations are not the bottleneck on the number of iterations in B3ReduceStrength. So I will make this bug an umbrella for other more precise bugs fixing the actual problems. 361360 2019-02-06 18:31:51 -0800 2019-02-06 18:45:47 -0800 WIP WIP_194222 text/plain 7258 rmorisset SW5kZXg6IFNvdXJjZS9KYXZhU2NyaXB0Q29yZS9iMy9CM1JlZHVjZVN0cmVuZ3RoLmNwcAo9PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09Ci0tLSBTb3VyY2UvSmF2YVNjcmlwdENvcmUvYjMvQjNSZWR1Y2VTdHJlbmd0aC5jcHAJ KHJldmlzaW9uIDI0MTEwOCkKKysrIFNvdXJjZS9KYXZhU2NyaXB0Q29yZS9iMy9CM1JlZHVjZVN0 cmVuZ3RoLmNwcAkod29ya2luZyBjb3B5KQpAQCAtNDg0LDggKzQ4NCwxMDYgQEAKICAgICB9CiAg ICAgCiBwcml2YXRlOgorICAgIFZhbHVlKiBidWlsZEluc3QoT3Bjb2RlIG9wY29kZSwgVmFsdWUq IGNoaWxkMCA9IG51bGxwdHIsIFZhbHVlKiBjaGlsZDEgPSBudWxscHRyLCBWYWx1ZSogY2hpbGQy ID0gbnVsbHB0cikKKyAgICB7CisgICAgICAgIGlmIChWYWx1ZSogdmFsdWUgPSB0cnlSZWR1Y2lu ZyhvcGNvZGUsIGNoaWxkMCwgY2hpbGQxLCBjaGlsZDIpKQorICAgICAgICAgICAgcmV0dXJuIHZh bHVlOworCisgICAgICAgIGlmIChjaGlsZDEgPT0gbnVsbHB0cikKKyAgICAgICAgICAgIHJldHVy 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