From: Igor Guryanov guryanov@synopsys.com
It's prohibited to put branch instruction in the very end of zero-delay loop. On execution this causes "Illegal instruction" exception.
Signed-off-by: Alexey Brodkin abrodkin@synopsys.com Signed-off-by: Igor Guryanov guryanov@synopsys.com --- arch/arc/lib/memcmp.S | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/arch/arc/lib/memcmp.S b/arch/arc/lib/memcmp.S index fa5aac5..87bccab 100644 --- a/arch/arc/lib/memcmp.S +++ b/arch/arc/lib/memcmp.S @@ -29,6 +29,7 @@ memcmp: ld.a %r4, [%r0, 8] ld.a %r5, [%r1, 8] brne WORD2, %r12, .Lodd + nop .Loop_end: asl_s SHIFT, SHIFT, 3 bhs_s .Last_cmp @@ -105,6 +106,7 @@ memcmp: ldb.a %r4, [%r0, 2] ldb.a %r5, [%r1, 2] brne %r3, %r12, .Lbyte_odd + nop .Lbyte_end: bcc .Lbyte_even brne %r4, %r5, .Lbyte_even