From: Russ Cox <rsc@golang.org>
Date: Tue, 23 Feb 2021 16:38:24 +0000 (-0500)
Subject: runtime: fix usleep on windows/arm
X-Git-Tag: go1.17beta1~1421
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=080119799b;p=gostls13.git

runtime: fix usleep on windows/arm

Changed calling convention to pre-multiply the argument by -100,
and then deleted the * 100 but not the negation in the windows/arm assembly.
Delete the negation.

Fixes the current all.bash breakage on windows/arm builder.
(Maybe that will uncover more.)

Change-Id: I13006a44866ecc007586deb180a49c038d70aa99
Reviewed-on: https://go-review.googlesource.com/c/go/+/295529
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
---

diff --git a/src/runtime/sys_windows_arm.s b/src/runtime/sys_windows_arm.s
index 4be5ce7da0..9a5d9b1dd4 100644
--- a/src/runtime/sys_windows_arm.s
+++ b/src/runtime/sys_windows_arm.s
@@ -375,12 +375,11 @@ TEXT runtime·tstart_stdcall(SB),NOSPLIT|NOFRAME,$0
 // duration (in -100ns units) is in dt+0(FP).
 // g may be nil.
 TEXT runtime·usleep2(SB),NOSPLIT|NOFRAME,$0-4
-	MOVW	dt+0(FP), R0
+	MOVW	dt+0(FP), R3
 	MOVM.DB.W [R4, R14], (R13)	// push {r4, lr}
 	MOVW	R13, R4			// Save SP
 	SUB	$8, R13			// R13 = R13 - 8
 	BIC	$0x7, R13		// Align SP for ABI
-	RSB	$0, R0, R3		// R3 = -R0
 	MOVW	$0, R1			// R1 = FALSE (alertable)
 	MOVW	$-1, R0			// R0 = handle
 	MOVW	R13, R2			// R2 = pTime