https://bugs.llvm.org/show_bug.cgi?id=43910
Bug ID: 43910
Summary: Loop splitting based on monotonic condition between
indvar and trip count
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Loop Optimizer
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
We could have something like:
void body();
void mainwork();
void remainder();
void bad(unsigned width) {
for(int col = 0; col < width; ++col) {
if(col >= (width - (width % 8))) // last 'width % 8' pixels.
remainder();
else
mainwork();
body();
}
}
Currently that loop is left as-is.
But it could be split into something like this, thus removing conditional from
loop.
void body();
void mainwork();
void remainder();
void good(unsigned width) {
for(int col = 0; col < (width - (width % 8)); ++col) {
if(false /*col >= (width - (width % 8))*/) // last 'width % 8' pixels.
remainder();
else
mainwork();
body();
}
for(int col = (width - (width % 8)); col < width; ++col) {
if(true /*col >= (width - (width % 8))*/) // last 'width % 8' pixels.
remainder();
else
mainwork();
body();
}
}
https://godbolt.org/z/SVWuJV
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