2014-05-22 Charles Baylis <charles.bay...@linaro.org>
* config/arm/bpabi.S (__aeabi_ldivmod): Perform division using
__udivmoddi4, and fixups for negative operands.
---
libgcc/config/arm/bpabi.S | 41 ++++++++++++++++++++++++++++++++++++++++-
1 file changed, 40 insertions(+), 1 deletion(-)
diff --git a/libgcc/config/arm/bpabi.S b/libgcc/config/arm/bpabi.S
index 3f9ece5..c044167 100644
--- a/libgcc/config/arm/bpabi.S
+++ b/libgcc/config/arm/bpabi.S
@@ -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(__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(__gnu_ldivmod_helper) __PLT__
+ 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 */
--
1.9.1
