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| author | Lynn Boger <laboger@linux.vnet.ibm.com> | 2018-10-22 16:02:43 -0400 |
|---|---|---|
| committer | Lynn Boger <laboger@linux.vnet.ibm.com> | 2018-10-23 20:25:29 +0000 |
| commit | e41fbc79ccfedc5bf4d07356c20de0731bd9cfd9 (patch) | |
| tree | 13b417879ccf5bbd3a0197f56dac447b383aacad /src/runtime/sys_linux_ppc64x.s | |
| parent | 6994731ec2babb6a4f2bbbb08dbe649767a25942 (diff) | |
| download | go-e41fbc79ccfedc5bf4d07356c20de0731bd9cfd9.tar.gz go-e41fbc79ccfedc5bf4d07356c20de0731bd9cfd9.zip | |
runtime: use unsigned load for iscgo variable in ppc64x runtime asm
This changes the runtime asm code that loads iscgo to use MOVBZ
instead of MOVB, avoiding an unnecessary sign extension. This is most
significant in runtime.save_g, reducing the size from 8 to 7
instructions.
Change-Id: Iaa2121464b5309e1f27fd91b19b5603c7aaf619d
Reviewed-on: https://go-review.googlesource.com/c/144217
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
Diffstat (limited to 'src/runtime/sys_linux_ppc64x.s')
| -rw-r--r-- | src/runtime/sys_linux_ppc64x.s | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/src/runtime/sys_linux_ppc64x.s b/src/runtime/sys_linux_ppc64x.s index 5b5df50d41..bf01099830 100644 --- a/src/runtime/sys_linux_ppc64x.s +++ b/src/runtime/sys_linux_ppc64x.s @@ -301,7 +301,7 @@ TEXT runtime·_sigtramp(SB),NOSPLIT,$64 // this might be called in external code context, // where g is not set. - MOVB runtime·iscgo(SB), R6 + MOVBZ runtime·iscgo(SB), R6 CMP R6, $0 BEQ 2(PC) BL runtime·load_g(SB) |