https://sourceware.org/bugzilla/show_bug.cgi?id=16886
Bug ID: 16886
Summary: setjmp/longjmp in libopcodes would be faster as
sigsetjmp w/ save=0
Product: binutils
Version: 2.24
Status: NEW
Severity: normal
Priority: P2
Component: binutils
Assignee: unassigned at sourceware dot org
Reporter: rsc at swtch dot com
Created attachment 7568
--> https://sourceware.org/bugzilla/attachment.cgi?id=7568&action=edit
sample input for objdump
Running objdump -d -z on a large x86 ELF executable on OS X, I find that it
makes many sigaltstack and sigprocmask calls. These are caused by the use of
setjmp/longjmp inside the i386 disassembler, although the pattern is repeated
on other architectures.
The longjmp is not being made out of a signal handler, so it appears that it
would be safe to use sigsetjmp(x, 0) and siglongjmp, avoiding those system
calls.
Command: x86_64-linux-elf-objdump -d -z test.elf >/dev/null
Time Before: 4.78u 0.41s 5.20r
Time After: 4.25u 0.00s 4.26r
I hacked up the comparison using #defines. I will leave a real fix to you.
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