https://bugs.llvm.org/show_bug.cgi?id=47397
Bug ID: 47397
Summary: [NPM] -time-passes does not aggregate time spent per
pass
Product: new-bugs
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: florian_h...@apple.com
CC: htmldevelo...@gmail.com, llvm-bugs@lists.llvm.org
It looks like `-time-passes` behaves differently under the new & legacy pass
manager.
The legacy pass manager shows a single entry for the time spent in a pass for
all functions, whereas the new pass manager shows separate entries for each
function a pass runs on.
Running `bin/opt -aa-pipeline=basic-aa -passes='dse' foo.ll -time-passes 2>&1
| grep DSEPass` on the IR below will show 2 entries for DSE, one for each
function.
Running `opt -dse foo.ll -time-passes 2>&1 | grep 'Dead Store'` shows a
single entry, containing the run times for DSE on both functions.
Personally I find the behavior of the legacy pass manager more useful, because
on files with many functions the output with the new pass manager becomes
un-manageable.
foo.ll:
define void @test1(i32* %Q, i32* %P) {
ret void
}
define void @test2(i32* %Q, i32* %P) {
ret void
}
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