llvm-project

Commit Graph

Author	SHA1	Message	Date
Eli Friedman	1b7fc154a5	Fix for PR2164: allow transforming arbitrary-width unsigned divides into multiplies. Some more cleverness would be nice, though. It would be nice if we could do this transformation on illegal types. Also, we would prefer a narrower constant when possible so that we can use a narrower multiply, which can be cheaper. llvm-svn: 60283	2008-11-30 06:02:26 +00:00
Dan Gohman	9a69341725	Don't lower srem/urem X%C to X-X/C*C unless the division is actually optimized. This avoids creating illegal divisions when the combiner is running after legalize; this fixes PR1815. Also, it produces better code in the included testcase by avoiding the subtract and multiply when the division isn't optimized. llvm-svn: 44341	2007-11-26 23:46:11 +00:00

Author

SHA1

Message

Date

Eli Friedman

1b7fc154a5

Fix for PR2164: allow transforming arbitrary-width unsigned divides into

multiplies.

Some more cleverness would be nice, though. It would be nice if we 
could do this transformation on illegal types.  Also, we would 
prefer a narrower constant when possible so that we can use a narrower
multiply, which can be cheaper.

llvm-svn: 60283

2008-11-30 06:02:26 +00:00

Dan Gohman

9a69341725

Don't lower srem/urem X%C to X-X/C*C unless the division is actually

optimized. This avoids creating illegal divisions when the combiner is
running after legalize; this fixes PR1815. Also, it produces better
code in the included testcase by avoiding the subtract and multiply
when the division isn't optimized.

llvm-svn: 44341

2007-11-26 23:46:11 +00:00

2 Commits