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bpabi.S (__aeabi_uldivmod): Optimise stack pointer manipulation. 

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

	* config/arm/bpabi.S (__aeabi_uldivmod): Optimise stack pointer
	manipulation.

From-SVN: r211791
This commit is contained in:
Charles Baylis 2014-06-18 15:40:31 +00:00 committed by Charles Baylis
parent 6857b807c2
commit c9dae335f5
2 changed files with 48 additions and 11 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2014-06-18 Charles Baylis <charles.baylis@linaro.org>
* config/arm/bpabi.S (__aeabi_uldivmod): Optimise stack pointer
manipulation.
2014-06-18 Charles Baylis <charles.baylis@linaro.org>
* config/arm/bpabi.S (__aeabi_uldivmod, __aeabi_ldivmod): Add comment

54
libgcc/config/arm/bpabi.S
View File

@ -120,6 +120,46 @@ ARM_FUNC_START aeabi_ulcmp
#endif
.endm
/* we can use STRD/LDRD on v5TE and later, and any Thumb-2 architecture. */
#if (defined(__ARM_EABI__) \
&& (defined(__thumb2__) \
|| (__ARM_ARCH >= 5 && defined(__TARGET_FEATURE_DSP))))
#define CAN_USE_LDRD 1
#else
#define CAN_USE_LDRD 0
#endif
/* set up stack from for call to __udivmoddi4. At the end of the macro the
stack is arranged as follows:
sp+12 / space for remainder
sp+8 \ (written by __udivmoddi4)
sp+4 lr
sp+0 sp+8 [rp (remainder pointer) argument for __udivmoddi4]
*/
.macro push_for_divide fname
#if defined(__thumb2__) && CAN_USE_LDRD
sub ip, sp, #8
strd ip, lr, [sp, #-16]!
#else
sub sp, sp, #8
do_push {sp, lr}
#endif
98: cfi_push 98b - \fname, 0xe, -0xc, 0x10
.endm
/* restore stack */
.macro pop_for_divide
ldr lr, [sp, #4]
#if CAN_USE_LDRD
ldrd r2, r3, [sp, #8]
add sp, sp, #16
#else
add sp, sp, #8
do_pop {r2, r3}
#endif
.endm
#ifdef L_aeabi_ldivmod
/* Perform 64 bit signed division.
@ -165,18 +205,10 @@ ARM_FUNC_START aeabi_uldivmod
cfi_start __aeabi_uldivmod, LSYM(Lend_aeabi_uldivmod)
test_div_by_zero unsigned
sub sp, sp, #8
#if defined(__thumb2__)
mov ip, sp
push {ip, lr}
#else
do_push {sp, lr}
#endif
98: cfi_push 98b - __aeabi_uldivmod, 0xe, -0xc, 0x10
push_for_divide __aeabi_uldivmod
/* arguments in (r0:r1), (r2:r3) and *sp */
bl SYM(__gnu_uldivmod_helper) __PLT__
ldr lr, [sp, #4]
add sp, sp, #8
do_pop {r2, r3}
pop_for_divide
RET
cfi_end LSYM(Lend_aeabi_uldivmod)