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internal/bytealg: fix Separator length check for Index/ppc64le

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Modified condition in the ASM implementation of indexbody to
determine if separator length crosses 16 bytes to BGT from BGE
to avoid incorrectly crossing a page.

Also fixed IndexString to invoke indexbodyp9 when on the POWER9
platform

Change-Id: I0602a797cc75287990eea1972e9e473744f6f5a9
Reviewed-on: https://go-review.googlesource.com/c/go/+/356849
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
Trust: Keith Randall <khr@golang.org>
This commit is contained in:
Archana R 2021-10-19 04:11:46 -05:00 committed by Lynn Boger
parent 8b0bea993d
commit 6ec9a1da2d
1 changed files with 3 additions and 3 deletions
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6
src/internal/bytealg/index_ppc64x.s
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@ -85,7 +85,7 @@ TEXT ·IndexString<ABIInternal>(SB),NOSPLIT|NOFRAME,$0-40
MOVBZ internal∕cpu·PPC64+const_offsetPPC64HasPOWER9(SB), R7
CMP R7, $1
BNE power8
BR indexbody<>(SB)
BR indexbodyp9<>(SB)
#endif
power8:
@ -152,7 +152,7 @@ loadge16:
ANDCC $15, R5, R9 // Find byte offset of sep
ADD R9, R6, R10 // Add sep len
CMP R10, $16 // Check if sep len+offset > 16
BGE sepcross16 // Sep crosses 16 byte boundary
BGT sepcross16 // Sep crosses 16 byte boundary
RLDICR $0, R5, $59, R8 // Adjust addr to 16 byte container
VLOADSWAP(R8, R0, V0, V0_)// Load 16 bytes @R8 into V0
@ -490,7 +490,7 @@ loadge16:
ANDCC $15, R5, R9 // Find byte offset of sep
ADD R9, R6, R10 // Add sep len
CMP R10, $16 // Check if sep len+offset > 16
BGE sepcross16 // Sep crosses 16 byte boundary
BGT sepcross16 // Sep crosses 16 byte boundary
RLDICR $0, R5, $59, R8 // Adjust addr to 16 byte container
LXVB16X (R8)(R0), V0_ // Load 16 bytes @R8 into V0