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bpabi.S (__aeabi_ldivmod): Perform division using __udivmoddi4, and fixups for negative operands.

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2014-06-18  Charles Baylis  <charles.baylis@linaro.org>

	* config/arm/bpabi.S (__aeabi_ldivmod): Perform division using
	__udivmoddi4, and fixups for negative operands.

From-SVN: r211794
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Charles Baylis 2014-06-18 15:42:53 +00:00 committed by Charles Baylis
parent f493def153
commit 1338118928
2 changed files with 45 additions and 1 deletions
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gcc/ChangeLog
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@ -1,3 +1,8 @@
2014-06-18 Charles Baylis <charles.baylis@linaro.org>
* config/arm/bpabi.S (__aeabi_ldivmod): Perform division using
__udivmoddi4, and fixups for negative operands.
2014-06-18 Charles Baylis <charles.baylis@linaro.org>
* config/arm/bpabi.S (__aeabi_ldivmod): Optimise stack manipulation.

41
libgcc/config/arm/bpabi.S
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@ -175,10 +175,49 @@ ARM_FUNC_START aeabi_ldivmod
test_div_by_zero signed
push_for_divide __aeabi_ldivmod
cmp xxh, #0
blt 1f
cmp yyh, #0
blt 2f
/* arguments in (r0:r1), (r2:r3) and *sp */
bl SYM(__gnu_ldivmod_helper) __PLT__
bl SYM(__udivmoddi4) __PLT__
pop_for_divide
RET
1: /* xxh:xxl is negative */
negs xxl, xxl
sbc xxh, xxh, xxh, lsl #1 /* Thumb-2 has no RSC, so use X - 2X */
cmp yyh, #0
blt 3f
/* arguments in (r0:r1), (r2:r3) and *sp */
bl SYM(__udivmoddi4) __PLT__
pop_for_divide
negs xxl, xxl
sbc xxh, xxh, xxh, lsl #1 /* Thumb-2 has no RSC, so use X - 2X */
negs yyl, yyl
sbc yyh, yyh, yyh, lsl #1 /* Thumb-2 has no RSC, so use X - 2X */
RET
2: /* only yyh:yyl is negative */
negs yyl, yyl
sbc yyh, yyh, yyh, lsl #1 /* Thumb-2 has no RSC, so use X - 2X */
/* arguments in (r0:r1), (r2:r3) and *sp */
bl SYM(__udivmoddi4) __PLT__
pop_for_divide
negs xxl, xxl
sbc xxh, xxh, xxh, lsl #1 /* Thumb-2 has no RSC, so use X - 2X */
RET
3: /* both xxh:xxl and yyh:yyl are negative */
negs yyl, yyl
sbc yyh, yyh, yyh, lsl #1 /* Thumb-2 has no RSC, so use X - 2X */
/* arguments in (r0:r1), (r2:r3) and *sp */
bl SYM(__udivmoddi4) __PLT__
pop_for_divide
negs yyl, yyl
sbc yyh, yyh, yyh, lsl #1 /* Thumb-2 has no RSC, so use X - 2X */
RET
cfi_end LSYM(Lend_aeabi_ldivmod)
#endif /* L_aeabi_ldivmod */