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runtime: use the CBZ instruction in the assembler

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Use CBZ to replace the comparison and branch of arm64 and the zero instruction in the assembly file.

Change-Id: Id6c03e9af13aadafc3ad3953f82d2ffa29c12926
Reviewed-on: https://go-review.googlesource.com/c/go/+/237497
Reviewed-by: Keith Randall <khr@golang.org>
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Heisenberg 2020-06-11 11:17:20 +08:00 committed by Keith Randall
parent e6d0bd2b89
commit a61a3c378d
3 changed files with 3 additions and 6 deletions
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3
src/runtime/rt0_freebsd_arm64.s
View File

@ -45,8 +45,7 @@ TEXT _rt0_arm64_freebsd_lib(SB),NOSPLIT,$184
// Create a new thread to do the runtime initialization and return. // Create a new thread to do the runtime initialization and return.
MOVD _cgo_sys_thread_create(SB), R4 MOVD _cgo_sys_thread_create(SB), R4
CMP $0, R4 CBZ R4, nocgo
BEQ nocgo
MOVD $_rt0_arm64_freebsd_lib_go(SB), R0 MOVD $_rt0_arm64_freebsd_lib_go(SB), R0
MOVD $0, R1 MOVD $0, R1
SUB $16, RSP // reserve 16 bytes for sp-8 where fp may be saved. SUB $16, RSP // reserve 16 bytes for sp-8 where fp may be saved.

3
src/runtime/rt0_netbsd_arm64.s
View File

@ -44,8 +44,7 @@ TEXT _rt0_arm64_netbsd_lib(SB),NOSPLIT,$184
// Create a new thread to do the runtime initialization and return. // Create a new thread to do the runtime initialization and return.
MOVD _cgo_sys_thread_create(SB), R4 MOVD _cgo_sys_thread_create(SB), R4
CMP $0, R4 CBZ R4, nocgo
BEQ nocgo
MOVD $_rt0_arm64_netbsd_lib_go(SB), R0 MOVD $_rt0_arm64_netbsd_lib_go(SB), R0
MOVD $0, R1 MOVD $0, R1
SUB $16, RSP // reserve 16 bytes for sp-8 where fp may be saved. SUB $16, RSP // reserve 16 bytes for sp-8 where fp may be saved.

3
src/runtime/rt0_openbsd_arm64.s
View File

@ -50,8 +50,7 @@ TEXT _rt0_arm64_openbsd_lib(SB),NOSPLIT,$184
// Create a new thread to do the runtime initialization and return. // Create a new thread to do the runtime initialization and return.
MOVD _cgo_sys_thread_create(SB), R4 MOVD _cgo_sys_thread_create(SB), R4
CMP $0, R4 CBZ R4, nocgo
BEQ nocgo
MOVD $_rt0_arm64_openbsd_lib_go(SB), R0 MOVD $_rt0_arm64_openbsd_lib_go(SB), R0
MOVD $0, R1 MOVD $0, R1
SUB $16, RSP // reserve 16 bytes for sp-8 where fp may be saved. SUB $16, RSP // reserve 16 bytes for sp-8 where fp may be saved.