diff options
| author | Kito Cheng <kito.cheng@gmail.com> | 2017-11-20 19:08:38 +0000 |
|---|---|---|
| committer | Palmer Dabbelt <palmer@gcc.gnu.org> | 2017-11-20 19:08:38 +0000 |
| commit | ee1c213355f0f9d33568c5118f318f22057d1454 (patch) | |
| tree | 3bd8236b9b97b36874d35eb0831ec0e8cdf2dce2 /include | |
| parent | d68ddd2b35078ab61f164b268bac63767b2a8e6a (diff) | |
RISC-V: Implement __umulsidi3, umul_ppmm and __muluw3
2017-11-20 Kito Cheng <kito.cheng@gmail.com>
* longlong.h [__riscv] (__umulsidi3): Define.
[__riscv] (umul_ppmm): Likewise.
[__riscv] (__muluw3): Likewise.
From-SVN: r254965
Diffstat (limited to 'include')
| -rw-r--r-- | include/ChangeLog | 6 | ||||
| -rw-r--r-- | include/longlong.h | 50 |
2 files changed, 56 insertions, 0 deletions
diff --git a/include/ChangeLog b/include/ChangeLog index 9cae3fb2bd8..33b3d4cde56 100644 --- a/include/ChangeLog +++ b/include/ChangeLog @@ -1,3 +1,9 @@ +2017-11-20 Kito Cheng <kito.cheng@gmail.com> + + * longlong.h [__riscv] (__umulsidi3): Define. + [__riscv] (umul_ppmm): Likewise. + [__riscv] (__muluw3): Likewise. + 2017-11-10 Stephen Crane <sjc@immunant.com> * plugin-api.h: Add plugin API for processing plugin-added diff --git a/include/longlong.h b/include/longlong.h index c24568acea0..946d5c8fc44 100644 --- a/include/longlong.h +++ b/include/longlong.h @@ -1050,6 +1050,56 @@ extern UDItype __umulsidi3 (USItype, USItype); } while (0) #endif +#if defined(__riscv) +#ifdef __riscv_mul +#define __umulsidi3(u,v) ((UDWtype)(UWtype)(u) * (UWtype)(v)) +#define __muluw3(a, b) ((UWtype)(a) * (UWtype)(b)) +#else +#if __riscv_xlen == 32 + #define MULUW3 "call __mulsi3" +#elif __riscv_xlen == 64 + #define MULUW3 "call __muldi3" +#else +#error unsupport xlen +#endif /* __riscv_xlen */ +/* We rely on the fact that MULUW3 doesn't clobber the t-registers. + It can get better register allocation result. */ +#define __muluw3(a, b) \ + ({ \ + register UWtype __op0 asm ("a0") = a; \ + register UWtype __op1 asm ("a1") = b; \ + asm volatile (MULUW3 \ + : "+r" (__op0), "+r" (__op1) \ + : \ + : "ra", "a2", "a3"); \ + __op0; \ + }) +#endif /* __riscv_mul */ +#define umul_ppmm(w1, w0, u, v) \ + do { \ + UWtype __x0, __x1, __x2, __x3; \ + UHWtype __ul, __vl, __uh, __vh; \ + \ + __ul = __ll_lowpart (u); \ + __uh = __ll_highpart (u); \ + __vl = __ll_lowpart (v); \ + __vh = __ll_highpart (v); \ + \ + __x0 = __muluw3 (__ul, __vl); \ + __x1 = __muluw3 (__ul, __vh); \ + __x2 = __muluw3 (__uh, __vl); \ + __x3 = __muluw3 (__uh, __vh); \ + \ + __x1 += __ll_highpart (__x0);/* this can't give carry */ \ + __x1 += __x2; /* but this indeed can */ \ + if (__x1 < __x2) /* did we get it? */ \ + __x3 += __ll_B; /* yes, add it in the proper pos. */ \ + \ + (w1) = __x3 + __ll_highpart (__x1); \ + (w0) = __ll_lowpart (__x1) * __ll_B + __ll_lowpart (__x0); \ + } while (0) +#endif /* __riscv */ + #if defined(__sh__) && W_TYPE_SIZE == 32 #ifndef __sh1__ #define umul_ppmm(w1, w0, u, v) \ |