diff options
| author | cbaylis <cbaylis@138bc75d-0d04-0410-961f-82ee72b054a4> | 2014-06-18 15:40:31 +0000 |
|---|---|---|
| committer | cbaylis <cbaylis@138bc75d-0d04-0410-961f-82ee72b054a4> | 2014-06-18 15:40:31 +0000 |
| commit | 6e96668585a26d5a7201b57aa4c95fff272fb069 (patch) | |
| tree | 675a28f7e4eabbb26e68bd7489d41df322cb6bb3 /libgcc | |
| parent | 79ebbd4177631d3ba7328bf08078173b9e49d13b (diff) | |
| download | gcc-6e96668585a26d5a7201b57aa4c95fff272fb069.tar.gz | |
2014-06-18 Charles Baylis <charles.baylis@linaro.org>
* config/arm/bpabi.S (__aeabi_uldivmod): Optimise stack pointer
manipulation.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@211791 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'libgcc')
| -rw-r--r-- | libgcc/config/arm/bpabi.S | 54 |
1 files changed, 43 insertions, 11 deletions
diff --git a/libgcc/config/arm/bpabi.S b/libgcc/config/arm/bpabi.S index ae76cd3c788..67246b0f095 100644 --- a/libgcc/config/arm/bpabi.S +++ b/libgcc/config/arm/bpabi.S @@ -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) |