Author: jasone
Date: Tue Jun 20 07:25:38 2017
New Revision: 320136
URL: https://svnweb.freebsd.org/changeset/base/320136
Log:
Decrease relative branch brittleness.
Replace conditional branches with trampolines to unconditional branches when
jumping to labels within other compilation units. This increases the offset
range from +-1 MiB to +-128 MiB.
Modified:
head/lib/libc/aarch64/gen/sigsetjmp.S
Modified: head/lib/libc/aarch64/gen/sigsetjmp.S
==============================================================================
--- head/lib/libc/aarch64/gen/sigsetjmp.S Tue Jun 20 06:20:09 2017
(r320135)
+++ head/lib/libc/aarch64/gen/sigsetjmp.S Tue Jun 20 07:25:38 2017
(r320136)
@@ -34,8 +34,10 @@ __FBSDID("$FreeBSD$");
ENTRY(sigsetjmp)
cmp x1, #0
- b.eq _C_LABEL(_setjmp)
+ b.eq 1f
b _C_LABEL(setjmp)
+1:
+ b _C_LABEL(_setjmp)
END(sigsetjmp)
ENTRY(siglongjmp)
@@ -45,8 +47,10 @@ ENTRY(siglongjmp)
/* Check the magic */
cmp x2, x3
- b.eq _C_LABEL(_longjmp)
+ b.eq 1f
b _C_LABEL(longjmp)
+1:
+ b _C_LABEL(_longjmp)
.align 3
.Lmagic:
.quad _JB_MAGIC__SETJMP
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