Some small speedups.

diff --git a/newlib/ChangeLog b/newlib/ChangeLog
index 22996b9..6463de4 100644 (file)
--- a/newlib/ChangeLog
+++ b/newlib/ChangeLog
@@ -1,4 +1,4 @@
-Sun Jul  7 01:23:45 2002  J"orn Rennecke <joern.rennecke@superh.com>
+Mon Jul  8 13:55:23 2002  J"orn Rennecke <joern.rennecke@superh.com>
 
        * libc/machine/sh/Makefile.am (lib_a_SOURCES):
        Make strcmp.S unconditional.

diff --git a/newlib/libc/machine/sh/strcmp.S b/newlib/libc/machine/sh/strcmp.S
index 850c82b..8dcc20b 100644 (file)
--- a/newlib/libc/machine/sh/strcmp.S
+++ b/newlib/libc/machine/sh/strcmp.S
@@ -55,14 +55,16 @@ ENTRY(strcmp)
        pt      loop,tr1
        bnei/u  r8,0,tr0 // r23_zero
        pt      found_zero,tr0
-       ori     r3,7,r3
-       addi    r3,9,r3
+       addi    r3,15,r3
+       andi    r3,-8,r3
        sub     r3,r2,r3
        bne/l   r7,r6,tr1 // loop
        /* The strings are aligned to each other.  */
+       /* It is possible to have a loop with six cycles / iteration
+          by re-ordering the exit conditions, but then it needs extra
+          time and/or code to sort out the r4 != r5 case.  */
        pt      al_loop,tr1
        pt      al_found_zero,tr0
-       addi    r3,-8,r3
 al_loop:
        ld.q    r2,8,r4
        ldx.q   r2,r3,r5
@@ -103,8 +105,8 @@ cmp_quad:
        blink tr2,r63
 found_zero:
        pt      zero_now,tr0
-       mcmpeq.b r63,r5,r7
        pt      cmp_quad,tr1
+       SHHI    r9,r20,r7
        bne/u   r8,r7,tr0 // zero_now
        bne/u   r4,r5,tr1 // cmp_quad
        SHLO    r9,r22,r8