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lib1funcs.asm (__udivsi3, __divsi3): Rearrange special case code to avoid one move instruction. 

* config/xtensa/lib1funcs.asm (__udivsi3, __divsi3): Rearrange special
	case code to avoid one move instruction.
	(__umodsi3, __modsi3): Merge duplicated code sequences.

From-SVN: r99520
This commit is contained in:
Bob Wilson 2005-05-10 15:56:54 +00:00 committed by Bob Wilson
parent ee58dffdbc
commit 53e0077e6f
2 changed files with 31 additions and 34 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2005-05-10 Bob Wilson <bob.wilson@acm.org>
* config/xtensa/lib1funcs.asm (__udivsi3, __divsi3): Rearrange special
case code to avoid one move instruction.
(__umodsi3, __modsi3): Merge duplicated code sequences.
2005-05-10 Kazu Hirata <kazu@cs.umass.edu>
* config/mips/24k.md, config/sh/divtab.c, config/sh/sh.c,

59
gcc/config/xtensa/lib1funcs.asm
View File

@ -299,19 +299,21 @@ __udivsi3:
.Lreturn:
abi_return
.Lspecial:
# return dividend >= divisor
movi a2, 0
bltu a6, a3, .Lreturn2
movi a2, 1
.Lreturn2:
abi_return
.Lle_one:
beqz a3, .Lerror # if divisor == 1, return the dividend
abi_return
.Lspecial:
# return dividend >= divisor
bltu a6, a3, .Lreturn0
movi a2, 1
abi_return
.Lerror:
movi a2, 0 # just return 0; could throw an exception
# just return 0; could throw an exception
.Lreturn0:
movi a2, 0
abi_return
.size __udivsi3,.-__udivsi3
@ -361,22 +363,24 @@ __divsi3:
movltz a2, a5, a7 # return (sign < 0) ? -quotient : quotient
abi_return
.Lspecial:
movi a2, 0
bltu a6, a3, .Lreturn2 # if dividend < divisor, return 0
movi a2, 1
movi a4, -1
movltz a2, a4, a7 # else return (sign < 0) ? -1 : 1
.Lreturn2:
abi_return
.Lle_one:
beqz a3, .Lerror
neg a2, a6 # if udivisor == 1, then return...
movgez a2, a6, a7 # (sign < 0) ? -udividend : udividend
abi_return
.Lspecial:
bltu a6, a3, .Lreturn0 # if dividend < divisor, return 0
movi a2, 1
movi a4, -1
movltz a2, a4, a7 # else return (sign < 0) ? -1 : 1
abi_return
.Lerror:
movi a2, 0 # just return 0; could throw an exception
# just return 0; could throw an exception
.Lreturn0:
movi a2, 0
abi_return
.size __divsi3,.-__divsi3
@ -414,17 +418,12 @@ __umodsi3:
#endif /* !XCHAL_HAVE_LOOPS */
.Lloopend:
.Lspecial:
bltu a2, a3, .Lreturn
sub a2, a2, a3 # subtract once more if dividend >= divisor
.Lreturn:
abi_return
.Lspecial:
bltu a2, a3, .Lreturn2
sub a2, a2, a3 # subtract once if dividend >= divisor
.Lreturn2:
abi_return
.Lle_one:
# the divisor is either 0 or 1, so just return 0.
# someday we may want to throw an exception if the divisor is 0.
@ -468,6 +467,7 @@ __modsi3:
#endif /* !XCHAL_HAVE_LOOPS */
.Lloopend:
.Lspecial:
bltu a2, a3, .Lreturn
sub a2, a2, a3 # subtract once more if udividend >= udivisor
.Lreturn:
@ -476,15 +476,6 @@ __modsi3:
.Lpositive:
abi_return
.Lspecial:
bltu a2, a3, .Lreturn2
sub a2, a2, a3 # subtract once if dividend >= divisor
.Lreturn2:
bgez a7, .Lpositive2
neg a2, a2 # if (dividend < 0), return -udividend
.Lpositive2:
abi_return
.Lle_one:
# udivisor is either 0 or 1, so just return 0.
# someday we may want to throw an exception if udivisor is 0.