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authorRajalakshmi Srinivasaraghavan <raji@linux.vnet.ibm.com>2017-07-03 10:46:13 +0530
committerRajalakshmi Srinivasaraghavan <raji@linux.vnet.ibm.com>2017-07-03 10:46:13 +0530
commit2572f356b18ddee03b331ba33f5a2ae65d031a59 (patch)
treeb3b0ee3b360fe7f115319e3b3a38bc30b9c98c38
parent8dc6133eff1c09382bc8f6f98c49fb807900eecd (diff)
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powerpc: Clean up strlen and strnlen for power8
To align a quadword aligned address to 64 bytes, maximum of three 16 bytes load is needed for worst case instead of loading four times.
-rw-r--r--ChangeLog5
-rw-r--r--sysdeps/powerpc/powerpc64/power8/strlen.S11
-rw-r--r--sysdeps/powerpc/powerpc64/power8/strnlen.S10
3 files changed, 6 insertions, 20 deletions
diff --git a/ChangeLog b/ChangeLog
index 4cd5d31770..9697355c79 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2017-07-03 Rajalakshmi Srinivasaraghavan <raji@linux.vnet.ibm.com>
+
+ * sysdeps/powerpc/powerpc64/power8/strlen.S: Remove unreachable code.
+ * sysdeps/powerpc/powerpc64/power8/strnlen.S: Likewise.
+
2017-07-01 Florian Weimer <fweimer@redhat.com>
H.J. Lu <hongjiu.lu@intel.com>
diff --git a/sysdeps/powerpc/powerpc64/power8/strlen.S b/sysdeps/powerpc/powerpc64/power8/strlen.S
index 8fdb6f5cc1..5691d1d93a 100644
--- a/sysdeps/powerpc/powerpc64/power8/strlen.S
+++ b/sysdeps/powerpc/powerpc64/power8/strlen.S
@@ -144,17 +144,6 @@ L(align64):
or r5,r10,r11
cmpdi cr7,r5,0
addi r9,r9,16
- bne cr7,L(dword_zero)
-
- andi. r10,r9,63
- beq cr0,L(preloop)
- ld r6,8(r4)
- ldu r5,16(r4)
- cmpb r10,r6,r0
- cmpb r11,r5,r0
- or r5,r10,r11
- cmpdi cr7,r5,0
- addi r9,r9,16
/* At this point, we are necessarily 64-byte aligned. If no zeroes were
found, jump to the vectorized loop. */
diff --git a/sysdeps/powerpc/powerpc64/power8/strnlen.S b/sysdeps/powerpc/powerpc64/power8/strnlen.S
index 07608ffa26..6d669d4a54 100644
--- a/sysdeps/powerpc/powerpc64/power8/strnlen.S
+++ b/sysdeps/powerpc/powerpc64/power8/strnlen.S
@@ -141,15 +141,7 @@ ENTRY_TOCLESS (__strnlen)
addi r4,r4,-16 /* Decrement maxlen in 16 bytes. */
bne cr6,L(found_aligning64B) /* If found null bytes. */
- /* Unroll 3x above code block until aligned or find null bytes. */
- andi. r7,r5,63
- beq cr0,L(preloop_64B)
- lvx v1,r5,r6
- vcmpequb. v1,v1,v0
- addi r5,r5,16
- addi r4,r4,-16
- bne cr6,L(found_aligning64B)
-
+ /* Unroll 2x above code block until aligned or find null bytes. */
andi. r7,r5,63
beq cr0,L(preloop_64B)
lvx v1,r5,r6