Closed
Bug 483030
Opened 15 years ago
Closed 15 years ago
TM: Don't emit overflow guards if the operation is constant
Categories
(Core :: JavaScript Engine, defect, P2)
Tracking
()
RESOLVED
FIXED
People
(Reporter: gal, Assigned: gal)
Details
(Whiteboard: fixed-in-tracemonkey)
Attachments
(1 file)
2.24 KB,
patch
|
dvander
:
review+
|
Details | Diff | Splinter Review |
I ran across this bug while reviewing the jit spew from https://bugzilla.mozilla.org/show_bug.cgi?id=480494. 00069: 53 setname "ret" 00073: 54 getlocal 0 00076: 54 getlocal 1 00079: 54 add 00080: 54 setlocal 0 00084: 54 goto 139 (55) 00139: 60 getarg 0 00142: 60 getlocal 1 00145: 60 sub sti sp[8] = and4570 st fmul503[616] = and4570 sti sp[0] = ld23292 sti sp[8] = ld23291 sti sp[0] = add2705 sti sp[-24] = add2705 sti sp[0] = ld23291 sti sp[8] = ld23291 xt3884 = ov 0 xt9490: xt xt3884 -> pc=0x1e2f5301 imacpc=0x0 sp+16 rp+0 The sub operation was constant folded here, yet we are checking for overflow.
Assignee | ||
Comment 1•15 years ago
|
||
Assignee: general → gal
Attachment #367097 -
Flags: review?(danderson)
Updated•15 years ago
|
Attachment #367097 -
Flags: review?(danderson) → review+
Assignee | ||
Comment 2•15 years ago
|
||
http://hg.mozilla.org/tracemonkey/rev/797ba90aed16 P2. The failure mode are unnecessary side-exits (perf regression), not correctness.
Whiteboard: fixed-in-tracemonkey
Assignee | ||
Updated•15 years ago
|
Priority: -- → P2
Updated•15 years ago
|
Flags: wanted1.9.1?
Comment 3•15 years ago
|
||
http://hg.mozilla.org/mozilla-central/rev/797ba90aed16
Status: NEW → RESOLVED
Closed: 15 years ago
Resolution: --- → FIXED
Updated•15 years ago
|
Flags: wanted1.9.1? → wanted1.9.1+
Updated•15 years ago
|
Flags: in-testsuite-
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Description
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