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(parent: b8f5c5e) | patch
RegExp: Remove use of 16-bit immediates on ia32/x64.
authorlrn@chromium.org <lrn@chromium.org@ce2b1a6d-e550-0410-aec6-3dcde31c8c00>
Tue, 11 May 2010 07:29:10 +0000 (07:29 +0000)
committerlrn@chromium.org <lrn@chromium.org@ce2b1a6d-e550-0410-aec6-3dcde31c8c00>
Tue, 11 May 2010 07:29:10 +0000 (07:29 +0000)
commite867e63281cf9878b3c5d27c6eeda08643711147
treedab96fee097f25bdfa8ed2086f30e016427362e2tree | snapshot
parentb8f5c5e1ac4cf16f960ede49401e7bbca66b9783commit | diff
RegExp: Remove use of 16-bit immediates on ia32/x64.
Also check more than one character at a time.
16-bit immediates requires a prefix that changes the length of the instruction.
This causes predecoder mispredictions and subsequent pipeline stalls.
Also removed redundant "atStart" local variable which is equivalent to startIndex == 0.

Review URL: http://codereview.chromium.org/1988009

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@4639 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
src/ia32/regexp-macro-assembler-ia32.cc diff | blob | history
src/ia32/regexp-macro-assembler-ia32.h diff | blob | history
src/x64/regexp-macro-assembler-x64.cc diff | blob | history
src/x64/regexp-macro-assembler-x64.h diff | blob | history
Domain: Web Framework / Web Engine;