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Diffstat (limited to 'libc/string/arc/memcmp.S')
-rw-r--r--libc/string/arc/memcmp.S29
1 files changed, 29 insertions, 0 deletions
diff --git a/libc/string/arc/memcmp.S b/libc/string/arc/memcmp.S
index 4c0e39143..a60757e7a 100644
--- a/libc/string/arc/memcmp.S
+++ b/libc/string/arc/memcmp.S
@@ -24,14 +24,32 @@ ENTRY(memcmp)
ld r4,[r0,0]
ld r5,[r1,0]
lsr.f lp_count,r3,3
+#ifdef __HS__
+ /* In ARCv2 a branch can't be the last instruction in a zero overhead
+ * loop.
+ * So we move the branch to the start of the loop, duplicate it
+ * after the end, and set up r12 so that the branch isn't taken
+ * initially.
+ */
+ mov_s r12,WORD2
+ lpne .Loop_end
+ brne WORD2,r12,.Lodd
+ ld WORD2,[r0,4]
+#else
lpne .Loop_end
ld_s WORD2,[r0,4]
+#endif
ld_s r12,[r1,4]
brne r4,r5,.Leven
ld.a r4,[r0,8]
ld.a r5,[r1,8]
+#ifdef __HS__
+.Loop_end:
+ brne WORD2,r12,.Lodd
+#else
brne WORD2,r12,.Lodd
.Loop_end:
+#endif
asl_s SHIFT,SHIFT,3
bhs_s .Last_cmp
brne r4,r5,.Leven
@@ -99,14 +117,25 @@ ENTRY(memcmp)
ldb r4,[r0,0]
ldb r5,[r1,0]
lsr.f lp_count,r3
+#ifdef __HS__
+ mov r12,r3
lpne .Lbyte_end
+ brne r3,r12,.Lbyte_odd
+#else
+ lpne .Lbyte_end
+#endif
ldb_s r3,[r0,1]
ldb r12,[r1,1]
brne r4,r5,.Lbyte_even
ldb.a r4,[r0,2]
ldb.a r5,[r1,2]
+#ifdef __HS__
+.Lbyte_end:
+ brne r3,r12,.Lbyte_odd
+#else
brne r3,r12,.Lbyte_odd
.Lbyte_end:
+#endif
bcc .Lbyte_even
brne r4,r5,.Lbyte_even
ldb_s r3,[r0,1]