From: Heisenberg Date: Thu, 11 Jun 2020 03:17:20 +0000 (+0800) Subject: runtime: use the CBZ instruction in the assembler X-Git-Tag: go1.16beta1~1310 X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=a61a3c378d9ce71d9b97a1b4fb3320b8b3d6a599;p=gostls13.git runtime: use the CBZ instruction in the assembler 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 Run-TryBot: Keith Randall TryBot-Result: Gobot Gobot --- diff --git a/src/runtime/rt0_freebsd_arm64.s b/src/runtime/rt0_freebsd_arm64.s index 3a348c33e2..a938d98262 100644 --- a/src/runtime/rt0_freebsd_arm64.s +++ b/src/runtime/rt0_freebsd_arm64.s @@ -45,8 +45,7 @@ TEXT _rt0_arm64_freebsd_lib(SB),NOSPLIT,$184 // Create a new thread to do the runtime initialization and return. MOVD _cgo_sys_thread_create(SB), R4 - CMP $0, R4 - BEQ nocgo + CBZ R4, nocgo MOVD $_rt0_arm64_freebsd_lib_go(SB), R0 MOVD $0, R1 SUB $16, RSP // reserve 16 bytes for sp-8 where fp may be saved. diff --git a/src/runtime/rt0_netbsd_arm64.s b/src/runtime/rt0_netbsd_arm64.s index 75ecbe5176..2f3b5a5a87 100644 --- a/src/runtime/rt0_netbsd_arm64.s +++ b/src/runtime/rt0_netbsd_arm64.s @@ -44,8 +44,7 @@ TEXT _rt0_arm64_netbsd_lib(SB),NOSPLIT,$184 // Create a new thread to do the runtime initialization and return. MOVD _cgo_sys_thread_create(SB), R4 - CMP $0, R4 - BEQ nocgo + CBZ R4, nocgo MOVD $_rt0_arm64_netbsd_lib_go(SB), R0 MOVD $0, R1 SUB $16, RSP // reserve 16 bytes for sp-8 where fp may be saved. diff --git a/src/runtime/rt0_openbsd_arm64.s b/src/runtime/rt0_openbsd_arm64.s index 12408f2eec..722fab6129 100644 --- a/src/runtime/rt0_openbsd_arm64.s +++ b/src/runtime/rt0_openbsd_arm64.s @@ -50,8 +50,7 @@ TEXT _rt0_arm64_openbsd_lib(SB),NOSPLIT,$184 // Create a new thread to do the runtime initialization and return. MOVD _cgo_sys_thread_create(SB), R4 - CMP $0, R4 - BEQ nocgo + CBZ R4, nocgo MOVD $_rt0_arm64_openbsd_lib_go(SB), R0 MOVD $0, R1 SUB $16, RSP // reserve 16 bytes for sp-8 where fp may be saved.