Aren/NetBSD
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Avoid mispredicted branches.

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ad 2008-05-30 12:09:59 +00:00
parent 4bb5a59ae8
commit 34ade0651a
1 changed files with 3 additions and 5 deletions
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8
sys/arch/amd64/amd64/vector.S
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@ -1,4 +1,4 @@
/* $NetBSD: vector.S,v 1.23 2008/05/25 16:08:41 bouyer Exp $ */
/* $NetBSD: vector.S,v 1.24 2008/05/30 12:09:59 ad Exp $ */
/*
* Copyright (c) 2001 Wasabi Systems, Inc.
@ -269,8 +269,7 @@ calltrap:
call _C_LABEL(trap)
.Lalltraps_checkusr:
testb $SEL_RPL,TF_CS(%rsp)
jnz .Lalltraps_checkast
jmp 6f
jz 6f
.Lalltraps_checkast:
movq CPUVAR(CURLWP),%r14
/* Check for ASTs on exit to user mode. */
@ -1008,8 +1007,7 @@ NENTRY(hypervisor_callback)
subq $8, %rdi; /* don't forget if_ppl */
call do_hypervisor_callback
testb $SEL_RPL,TF_CS(%rsp)
jz 1f
jmp doreti_checkast
jnz doreti_checkast
1:
INTRFASTEXIT