Blame SOURCES/glibc-rh1871395-1.patch
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commit 0792c8ae1aebf538de45ff9a0e2e401a60525de2
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Author: Stefan Liebler <stli@linux.ibm.com>
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Date: Fri Jun 26 09:45:11 2020 +0200
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S390: Optimize __memcpy_z196.
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This patch introduces an extra loop without pfd instructions
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as it turned out that the pfd instructions are usefull
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for copies >=64KB but are counterproductive for smaller copies.
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diff --git a/sysdeps/s390/memcpy-z900.S b/sysdeps/s390/memcpy-z900.S
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index f2e9aaeb2d..dc2f491ec3 100644
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--- a/sysdeps/s390/memcpy-z900.S
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+++ b/sysdeps/s390/memcpy-z900.S
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@@ -184,25 +184,34 @@ ENTRY(MEMCPY_Z196)
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je .L_Z196_4
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.L_Z196_start2:
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aghi %r4,-1
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- srlg %r5,%r4,8
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- ltgr %r5,%r5
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+ risbg %r5,%r4,8,128+63,56 # r0 = r5 / 256
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jne .L_Z196_5
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.L_Z196_3:
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exrl %r4,.L_Z196_14
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.L_Z196_4:
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br %r14
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.L_Z196_5:
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- cgfi %r5,262144 # Switch to mvcle for copies >64MB
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- jh __memcpy_mvcle
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+ cgfi %r5,255 # Switch to loop with pfd for copies >=64kB
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+ jh .L_Z196_6
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.L_Z196_2:
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- pfd 1,768(%r3)
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- pfd 2,768(%r1)
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mvc 0(256,%r1),0(%r3)
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aghi %r5,-1
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la %r1,256(%r1)
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la %r3,256(%r3)
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jne .L_Z196_2
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j .L_Z196_3
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+.L_Z196_6:
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+ cgfi %r5,262144 # Switch to mvcle for copies >64MB
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+ jh __memcpy_mvcle
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+.L_Z196_7:
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+ pfd 1,1024(%r3)
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+ pfd 2,1024(%r1)
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+ mvc 0(256,%r1),0(%r3)
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+ aghi %r5,-1
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+ la %r1,256(%r1)
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+ la %r3,256(%r3)
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+ jne .L_Z196_7
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+ j .L_Z196_3
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.L_Z196_14:
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mvc 0(1,%r1),0(%r3)
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END(MEMCPY_Z196)
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