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Some small speedups.

This commit is contained in:
Joern Rennecke 2002-07-08 12:56:32 +00:00
parent 23c3a85872
commit e47e6f0e30
2 changed files with 7 additions and 5 deletions
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2
newlib/ChangeLog
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@ -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): * libc/machine/sh/Makefile.am (lib_a_SOURCES):
Make strcmp.S unconditional. Make strcmp.S unconditional.

10
newlib/libc/machine/sh/strcmp.S
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@ -55,14 +55,16 @@ ENTRY(strcmp)
pt loop,tr1 pt loop,tr1
bnei/u r8,0,tr0 // r23_zero bnei/u r8,0,tr0 // r23_zero
pt found_zero,tr0 pt found_zero,tr0
ori r3,7,r3 addi r3,15,r3
addi r3,9,r3 andi r3,-8,r3
sub r3,r2,r3 sub r3,r2,r3
bne/l r7,r6,tr1 // loop bne/l r7,r6,tr1 // loop
/* The strings are aligned to each other. */ /* 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_loop,tr1
pt al_found_zero,tr0 pt al_found_zero,tr0
addi r3,-8,r3
al_loop: al_loop:
ld.q r2,8,r4 ld.q r2,8,r4
ldx.q r2,r3,r5 ldx.q r2,r3,r5
@ -103,8 +105,8 @@ cmp_quad:
blink tr2,r63 blink tr2,r63
found_zero: found_zero:
pt zero_now,tr0 pt zero_now,tr0
mcmpeq.b r63,r5,r7
pt cmp_quad,tr1 pt cmp_quad,tr1
SHHI r9,r20,r7
bne/u r8,r7,tr0 // zero_now bne/u r8,r7,tr0 // zero_now
bne/u r4,r5,tr1 // cmp_quad bne/u r4,r5,tr1 // cmp_quad
SHLO r9,r22,r8 SHLO r9,r22,r8