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Commit Graph

Author	SHA1	Message	Date
Jakob Stoklund Olesen	4c82a9e7d0	Detect and handle COPY in many places. This code is transitional, it will soon be possible to eliminate isExtractSubreg, isInsertSubreg, and isMoveInstr in most places. llvm-svn: 107547	2010-07-03 00:04:37 +00:00
Bob Wilson	01abf8fc2f	Besides removing phi cycles that reduce to a single value, also remove dead phi cycles. Adjust a few tests to keep dead instructions from being optimized away. This (together with my previous change for phi cycles) fixes Apple radar 7627077. llvm-svn: 96057	2010-02-13 00:31:44 +00:00
Bob Wilson	0827e040e0	Add a new pass on machine instructions to optimize away PHI cycles that reduce down to a single value. InstCombine already does this transformation but DAG legalization may introduce new opportunities. This has turned out to be important for ARM where 64-bit values are split up during type legalization: InstCombine is not able to remove the PHI cycles on the 64-bit values but the separate 32-bit values can be optimized. I measured the compile time impact of this (running llc on 176.gcc) and it was not significant. llvm-svn: 95951	2010-02-12 01:30:21 +00:00

Author

SHA1

Message

Date

Jakob Stoklund Olesen

4c82a9e7d0

Detect and handle COPY in many places.

This code is transitional, it will soon be possible to eliminate
isExtractSubreg, isInsertSubreg, and isMoveInstr in most places.

llvm-svn: 107547

2010-07-03 00:04:37 +00:00

Bob Wilson

01abf8fc2f

Besides removing phi cycles that reduce to a single value, also remove dead

phi cycles.  Adjust a few tests to keep dead instructions from being optimized
away.  This (together with my previous change for phi cycles) fixes Apple
radar 7627077.

llvm-svn: 96057

2010-02-13 00:31:44 +00:00

Bob Wilson

0827e040e0

Add a new pass on machine instructions to optimize away PHI cycles that

reduce down to a single value.  InstCombine already does this transformation
but DAG legalization may introduce new opportunities.  This has turned out to
be important for ARM where 64-bit values are split up during type legalization:
InstCombine is not able to remove the PHI cycles on the 64-bit values but
the separate 32-bit values can be optimized.  I measured the compile time 
impact of this (running llc on 176.gcc) and it was not significant.

llvm-svn: 95951

2010-02-12 01:30:21 +00:00

3 Commits