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PowerPC LE memset 

http://sourceware.org/ml/libc-alpha/2013-08/msg00104.html

One of the things I noticed when looking at power7 timing is that rlwimi
is cracked and the two resulting insns have a register dependency.
That makes it a little slower than the equivalent rldimi.

	* sysdeps/powerpc/powerpc64/memset.S: Replace rlwimi with
        insrdi.  Formatting.
	* sysdeps/powerpc/powerpc64/power4/memset.S: Likewise.
	* sysdeps/powerpc/powerpc64/power6/memset.S: Likewise.
	* sysdeps/powerpc/powerpc64/power7/memset.S: Likewise.
	* sysdeps/powerpc/powerpc32/power4/memset.S: Likewise.
	* sysdeps/powerpc/powerpc32/power6/memset.S: Likewise.
	* sysdeps/powerpc/powerpc32/power7/memset.S: Likewise.
This commit is contained in:
Alan Modra 2013-08-17 18:47:59 +09:30
parent 759cfef3ac
commit 3be87c77d2
8 changed files with 45 additions and 34 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
ChangeLog
View File

@ -1,3 +1,14 @@
2013-10-04 Alan Modra <amodra@gmail.com>
* sysdeps/powerpc/powerpc64/memset.S: Replace rlwimi with
insrdi. Formatting.
* sysdeps/powerpc/powerpc64/power4/memset.S: Likewise.
* sysdeps/powerpc/powerpc64/power6/memset.S: Likewise.
* sysdeps/powerpc/powerpc64/power7/memset.S: Likewise.
* sysdeps/powerpc/powerpc32/power4/memset.S: Likewise.
* sysdeps/powerpc/powerpc32/power6/memset.S: Likewise.
* sysdeps/powerpc/powerpc32/power7/memset.S: Likewise.
2013-10-04 Alan Modra <amodra@gmail.com>
* sysdeps/powerpc/powerpc32/power4/memcpy.S: Add little endian support.

4
sysdeps/powerpc/powerpc32/power4/memset.S
View File

@ -50,7 +50,7 @@ L(_memset):
/* Align to word boundary. */
cmplwi cr5, rLEN, 31
rlwimi rCHR, rCHR, 8, 16, 23 /* Replicate byte to halfword. */
insrdi rCHR, rCHR, 8, 48 /* Replicate byte to halfword. */
beq+ L(aligned)
mtcrf 0x01, rMEMP0
subfic rALIGN, rALIGN, 4
@ -65,7 +65,7 @@ L(g0):
/* Handle the case of size < 31. */
L(aligned):
mtcrf 0x01, rLEN
rlwimi rCHR, rCHR, 16, 0, 15 /* Replicate halfword to word. */
insrdi rCHR, rCHR, 16, 32 /* Replicate halfword to word. */
ble cr5, L(medium)
/* Align to 32-byte boundary. */
andi. rALIGN, rMEMP, 0x1C

4
sysdeps/powerpc/powerpc32/power6/memset.S
View File

@ -48,7 +48,7 @@ L(_memset):
ble- cr1, L(small)
/* Align to word boundary. */
cmplwi cr5, rLEN, 31
rlwimi rCHR, rCHR, 8, 16, 23 /* Replicate byte to halfword. */
insrdi rCHR, rCHR, 8, 48 /* Replicate byte to halfword. */
beq+ L(aligned)
mtcrf 0x01, rMEMP0
subfic rALIGN, rALIGN, 4
@ -64,7 +64,7 @@ L(g0):
/* Handle the case of size < 31. */
L(aligned):
mtcrf 0x01, rLEN
rlwimi rCHR, rCHR, 16, 0, 15 /* Replicate halfword to word. */
insrdi rCHR, rCHR, 16, 32 /* Replicate halfword to word. */
ble cr5, L(medium)
/* Align to 32-byte boundary. */
andi. rALIGN, rMEMP, 0x1C

4
sysdeps/powerpc/powerpc32/power7/memset.S
View File

@ -35,8 +35,8 @@ L(_memset):
cfi_offset(31,-8)
/* Replicate byte to word. */
rlwimi 4,4,8,16,23
rlwimi 4,4,16,0,15
insrdi 4,4,8,48
insrdi 4,4,16,32
ble cr6,L(small) /* If length <= 8, use short copy code. */

10
sysdeps/powerpc/powerpc64/memset.S
View File

@ -55,14 +55,14 @@ L(_memset):
/* Align to doubleword boundary. */
cmpldi cr5, rLEN, 31
rlwimi rCHR, rCHR, 8, 16, 23 /* Replicate byte to halfword. */
insrdi rCHR, rCHR, 8, 48 /* Replicate byte to halfword. */
beq+ L(aligned2)
mtcrf 0x01, rMEMP0
subfic rALIGN, rALIGN, 8
cror 28,30,31 /* Detect odd word aligned. */
add rMEMP, rMEMP, rALIGN
sub rLEN, rLEN, rALIGN
rlwimi rCHR, rCHR, 16, 0, 15 /* Replicate halfword to word. */
insrdi rCHR, rCHR, 16, 32 /* Replicate halfword to word. */
bt 29, L(g4)
/* Process the even word of doubleword. */
bf+ 31, L(g2)
@ -84,14 +84,14 @@ L(g0):
/* Handle the case of size < 31. */
L(aligned2):
rlwimi rCHR, rCHR, 16, 0, 15 /* Replicate halfword to word. */
insrdi rCHR, rCHR, 16, 32 /* Replicate halfword to word. */
L(aligned):
mtcrf 0x01, rLEN
ble cr5, L(medium)
/* Align to 32-byte boundary. */
andi. rALIGN, rMEMP, 0x18
subfic rALIGN, rALIGN, 0x20
insrdi rCHR,rCHR,32,0 /* Replicate word to double word. */
insrdi rCHR, rCHR, 32, 0 /* Replicate word to double word. */
beq L(caligned)
mtcrf 0x01, rALIGN
add rMEMP, rMEMP, rALIGN
@ -212,7 +212,7 @@ L(le4):
/* Memset of 0-31 bytes. */
.align 5
L(medium):
insrdi rCHR,rCHR,32,0 /* Replicate word to double word. */
insrdi rCHR, rCHR, 32, 0 /* Replicate word to double word. */
cmpldi cr1, rLEN, 16
L(medium_tail2):
add rMEMP, rMEMP, rLEN

30
sysdeps/powerpc/powerpc64/power4/memset.S
View File

@ -50,14 +50,14 @@ L(_memset):
/* Align to doubleword boundary. */
cmpldi cr5, rLEN, 31
rlwimi rCHR, rCHR, 8, 16, 23 /* Replicate byte to halfword. */
insrdi rCHR, rCHR, 8, 48 /* Replicate byte to halfword. */
beq+ L(aligned2)
mtcrf 0x01, rMEMP0
subfic rALIGN, rALIGN, 8
cror 28,30,31 /* Detect odd word aligned. */
add rMEMP, rMEMP, rALIGN
sub rLEN, rLEN, rALIGN
rlwimi rCHR, rCHR, 16, 0, 15 /* Replicate halfword to word. */
insrdi rCHR, rCHR, 16, 32 /* Replicate halfword to word. */
bt 29, L(g4)
/* Process the even word of doubleword. */
bf+ 31, L(g2)
@ -79,14 +79,14 @@ L(g0):
/* Handle the case of size < 31. */
L(aligned2):
rlwimi rCHR, rCHR, 16, 0, 15 /* Replicate halfword to word. */
insrdi rCHR, rCHR, 16, 32 /* Replicate halfword to word. */
L(aligned):
mtcrf 0x01, rLEN
ble cr5, L(medium)
/* Align to 32-byte boundary. */
andi. rALIGN, rMEMP, 0x18
subfic rALIGN, rALIGN, 0x20
insrdi rCHR,rCHR,32,0 /* Replicate word to double word. */
insrdi rCHR, rCHR, 32, 0 /* Replicate word to double word. */
beq L(caligned)
mtcrf 0x01, rALIGN
add rMEMP, rMEMP, rALIGN
@ -146,24 +146,24 @@ L(zloopstart):
L(getCacheAligned):
cmpldi cr1,rLEN,32
andi. rTMP,rMEMP,127
blt cr1,L(handletail32)
beq L(cacheAligned)
blt cr1,L(handletail32)
beq L(cacheAligned)
addi rMEMP,rMEMP,32
addi rLEN,rLEN,-32
std rCHR,-32(rMEMP)
std rCHR,-24(rMEMP)
std rCHR,-16(rMEMP)
std rCHR,-8(rMEMP)
b L(getCacheAligned)
std rCHR,-32(rMEMP)
std rCHR,-24(rMEMP)
std rCHR,-16(rMEMP)
std rCHR,-8(rMEMP)
b L(getCacheAligned)
/* Now we are aligned to the cache line and can use dcbz. */
L(cacheAligned):
cmpld cr1,rLEN,rCLS
blt cr1,L(handletail32)
blt cr1,L(handletail32)
dcbz 0,rMEMP
subf rLEN,rCLS,rLEN
add rMEMP,rMEMP,rCLS
b L(cacheAligned)
add rMEMP,rMEMP,rCLS
b L(cacheAligned)
/* We are here because the cache line size was set and was not 32-bytes
and the remainder (rLEN) is less than the actual cache line size.
@ -200,7 +200,7 @@ L(le4):
/* Memset of 0-31 bytes. */
.align 5
L(medium):
insrdi rCHR,rCHR,32,0 /* Replicate word to double word. */
insrdi rCHR, rCHR, 32, 0 /* Replicate word to double word. */
cmpldi cr1, rLEN, 16
L(medium_tail2):
add rMEMP, rMEMP, rLEN

10
sysdeps/powerpc/powerpc64/power6/memset.S
View File

@ -47,14 +47,14 @@ L(_memset):
/* Align to doubleword boundary. */
cmpldi cr5, rLEN, 31
rlwimi rCHR, rCHR, 8, 16, 23 /* Replicate byte to halfword. */
insrdi rCHR, rCHR, 8, 48 /* Replicate byte to halfword. */
beq+ L(aligned2)
mtcrf 0x01, rMEMP0
subfic rALIGN, rALIGN, 8
cror 28,30,31 /* Detect odd word aligned. */
add rMEMP, rMEMP, rALIGN
sub rLEN, rLEN, rALIGN
rlwimi rCHR, rCHR, 16, 0, 15 /* Replicate halfword to word. */
insrdi rCHR, rCHR, 16, 32 /* Replicate halfword to word. */
bt 29, L(g4)
/* Process the even word of doubleword. */
bf+ 31, L(g2)
@ -76,14 +76,14 @@ L(g0):
/* Handle the case of size < 31. */
L(aligned2):
rlwimi rCHR, rCHR, 16, 0, 15 /* Replicate halfword to word. */
insrdi rCHR, rCHR, 16, 32 /* Replicate halfword to word. */
L(aligned):
mtcrf 0x01, rLEN
ble cr5, L(medium)
/* Align to 32-byte boundary. */
andi. rALIGN, rMEMP, 0x18
subfic rALIGN, rALIGN, 0x20
insrdi rCHR,rCHR,32,0 /* Replicate word to double word. */
insrdi rCHR, rCHR, 32, 0 /* Replicate word to double word. */
beq L(caligned)
mtcrf 0x01, rALIGN
add rMEMP, rMEMP, rALIGN
@ -344,7 +344,7 @@ L(le4):
/* Memset of 0-31 bytes. */
.align 5
L(medium):
insrdi rCHR,rCHR,32,0 /* Replicate word to double word. */
insrdi rCHR, rCHR, 32, 0 /* Replicate word to double word. */
cmpldi cr1, rLEN, 16
L(medium_tail2):
add rMEMP, rMEMP, rLEN

6
sysdeps/powerpc/powerpc64/power7/memset.S
View File

@ -32,8 +32,8 @@ L(_memset):
mr 10,3
/* Replicate byte to word. */
rlwimi 4,4,8,16,23
rlwimi 4,4,16,0,15
insrdi 4,4,8,48
insrdi 4,4,16,32
ble cr6,L(small) /* If length <= 8, use short copy code. */
neg 0,3
@ -321,7 +321,7 @@ L(medium):
clrldi 0,0,62
beq L(medium_aligned)
/* Force 4-bytes alignment for SRC. */
/* Force 4-bytes alignment for DST. */
mtocrf 0x01,0
subf 5,0,5
1: /* Copy 1 byte. */