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Commit Graph

Author	SHA1	Message	Date
Craig Topper	dfa997992b	Fix a couple include directives that used angle brackets for llvm files. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163978 91177308-0d34-0410-b5e6-96231b3b80d8	2012-09-15 18:41:37 +00:00
Jim Grosbach	fc1a161d76	Switch the fixed-length disassembler to be table-driven. Refactor the TableGen'erated fixed length disassemblmer to use a table-driven state machine rather than a massive set of nested switch() statements. As a result, the ARM Disassembler (ARMDisassembler.cpp) builds much more quickly and generates a smaller end result. For a Release+Asserts build on a 16GB 3.4GHz i7 iMac w/ SSD: Time to compile at -O2 (averaged w/ hot caches): Previous: 35.5s New: 8.9s TEXT size: Previous: 447,251 New: 297,661 Builds in 25% of the time previously required and generates code 66% of the size. Execution time of the disassembler is only slightly slower (7% disassembling 10 million ARM instructions, 19.6s vs 21.0s). The new implementation has not yet been tuned, however, so the performance should almost certainly be recoverable should it become a concern. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161888 91177308-0d34-0410-b5e6-96231b3b80d8	2012-08-14 19:06:05 +00:00
Jim Grosbach	2d39a0e52d	Move [SU]LEB128 encoding to a utility header. These functions are very generic. There's no reason for them to be tied to MCObjectWriter. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161545 91177308-0d34-0410-b5e6-96231b3b80d8	2012-08-08 23:56:06 +00:00

Author

SHA1

Message

Date

Craig Topper

dfa997992b

Fix a couple include directives that used angle brackets for llvm files.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163978 91177308-0d34-0410-b5e6-96231b3b80d8

2012-09-15 18:41:37 +00:00

Jim Grosbach

fc1a161d76

Switch the fixed-length disassembler to be table-driven.

Refactor the TableGen'erated fixed length disassemblmer to use a
table-driven state machine rather than a massive set of nested
switch() statements.

As a result, the ARM Disassembler (ARMDisassembler.cpp) builds much more
quickly and generates a smaller end result. For a Release+Asserts build on
a 16GB 3.4GHz i7 iMac w/ SSD:

Time to compile at -O2 (averaged w/ hot caches):
  Previous: 35.5s
  New:       8.9s

TEXT size:
  Previous: 447,251
  New:      297,661

Builds in 25% of the time previously required and generates code 66% of
the size.

Execution time of the disassembler is only slightly slower (7% disassembling
10 million ARM instructions, 19.6s vs 21.0s). The new implementation has
not yet been tuned, however, so the performance should almost certainly
be recoverable should it become a concern.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161888 91177308-0d34-0410-b5e6-96231b3b80d8

2012-08-14 19:06:05 +00:00

Jim Grosbach

2d39a0e52d

Move [SU]LEB128 encoding to a utility header.

These functions are very generic. There's no reason for them to
be tied to MCObjectWriter.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161545 91177308-0d34-0410-b5e6-96231b3b80d8

2012-08-08 23:56:06 +00:00

3 Commits