hash/crc32: improve performance of ppc64SlicingUpdateBy8 on ppc64le

Reduce the number of instructions in the short loop of
ppc64SlicingUpdateBy8 function by combining MOVWZ and SRD into a SRD
with appropriate parameters performing the same operation and remove
MOVWZ R7,R7 from the loop
This change produces the following improvements on POWER9. None of the
other tests regress. Improvments on other POWERPC platforms similar.

name                                     old time/op    new time/op
delta

CRC32/poly=IEEE/size=15/align=0            80.5ns ± 0%    70.6ns ± 0%
-12%
CRC32/poly=IEEE/size=15/align=1            80.5ns ± 0%    70.6ns ± 0%
-12%
CRC32/poly=IEEE/size=512/align=1            151ns ± 0%     139ns ± 0%
-7%
CRC32/poly=IEEE/size=1kB/align=1            167ns ± 0%     155ns ± 0%
-7%
CRC32/poly=Castagnoli/size=15/align=0      80.2ns ± 0%    70.5ns ± 0%
-12%
CRC32/poly=Castagnoli/size=15/align=1      80.2ns ± 0%    70.5ns ± 0%
-12%
CRC32/poly=Castagnoli/size=512/align=1      150ns ± 0%     139ns ± 0%
-7%
CRC32/poly=Castagnoli/size=1kB/align=1      166ns ± 0%     155ns ± 0%
-6%

Change-Id: I424709041c30d1c637b595d0845e3ae78dc3e0a0
Reviewed-on: https://go-review.googlesource.com/c/go/+/350989
Reviewed-by: Lynn Boger <[email protected]>
Reviewed-by: Cherry Mui <[email protected]>
Run-TryBot: Lynn Boger <[email protected]>
TryBot-Result: Go Bot <[email protected]>

src/hash/crc32/crc32_ppc64le.s

@@ -112,19 +112,17 @@ loop:
 	ANDCC	$7,R6,R8	// any leftover bytes
 	BEQ	done		// none --> done
 	MOVD	R8,CTR		// byte count
-
+        PCALIGN $16             // align short loop
 short:
 	MOVBZ   0(R5),R8        // get v
 	MOVBZ   R7,R9           // byte(crc) -> R8 BE vs LE?
-	MOVWZ	R7,R14
-	SRD	$8,R14,R14	// crc>>8
+        SRD     $8,R7,R14       // crc>>8
 	XOR     R8,R9,R8        // byte(crc)^v -> R8
 	ADD	$1,R5		// ptr to next v
 	SLD     $2,R8           // convert index-> bytes
 	ADD     R8,R4,R9        // &tab[byte(crc)^v]
 	MOVWZ   0(R9),R10       // tab[byte(crc)^v]
 	XOR     R10,R14,R7       // loop crc in R7
-	MOVWZ   R7,R7           // 32 bits
 	BC      16,0,short
 done:
 	NOR     R7,R7,R7        // ^crc