| 1 | /* Copyright (c) 2017 SiFive Inc. All rights reserved. |
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| 2 | |
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| 3 | This copyrighted material is made available to anyone wishing to use, |
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| 4 | modify, copy, or redistribute it subject to the terms and conditions |
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| 5 | of the FreeBSD License. This program is distributed in the hope that |
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| 6 | it will be useful, but WITHOUT ANY WARRANTY expressed or implied, |
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| 7 | including the implied warranties of MERCHANTABILITY or FITNESS FOR |
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| 8 | A PARTICULAR PURPOSE. A copy of this license is available at |
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| 9 | http://www.opensource.org/licenses. |
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| 10 | */ |
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| 11 | |
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| 12 | #include <ieeefp.h> |
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| 13 | |
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| 14 | #ifdef __riscv_flen |
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| 15 | static void |
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| 16 | fssr(unsigned value) |
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| 17 | { |
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| 18 | asm volatile ("fssr %0" :: "r"(value)); |
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| 19 | } |
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| 20 | |
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| 21 | static unsigned |
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| 22 | frsr() |
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| 23 | { |
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| 24 | unsigned value; |
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| 25 | asm volatile ("frsr %0" : "=r" (value)); |
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| 26 | return value; |
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| 27 | } |
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| 28 | |
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| 29 | static fp_rnd |
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| 30 | frm_fp_rnd (unsigned frm) |
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| 31 | { |
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| 32 | switch (frm) |
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| 33 | { |
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| 34 | case 0: return FP_RN; |
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| 35 | case 1: return FP_RZ; |
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| 36 | case 2: return FP_RM; |
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| 37 | case 3: return FP_RP; |
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| 38 | /* 4 ~ 7 is invalid value, so just retun FP_RP. */ |
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| 39 | default:return FP_RP; |
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| 40 | } |
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| 41 | } |
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| 42 | |
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| 43 | #endif /* __riscv_flen */ |
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| 44 | |
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| 45 | fp_except |
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| 46 | fpgetmask(void) |
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| 47 | { |
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| 48 | return 0; |
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| 49 | } |
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| 50 | |
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| 51 | fp_rnd |
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| 52 | fpgetround(void) |
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| 53 | { |
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| 54 | #ifdef __riscv_flen |
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| 55 | unsigned rm = (frsr () >> 5) & 0x7; |
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| 56 | return frm_fp_rnd (rm); |
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| 57 | #else |
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| 58 | return FP_RZ; |
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| 59 | #endif /* __riscv_flen */ |
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| 60 | } |
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| 61 | |
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| 62 | fp_except |
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| 63 | fpgetsticky(void) |
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| 64 | { |
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| 65 | #ifdef __riscv_flen |
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| 66 | return frsr () & 0x1f; |
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| 67 | #else |
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| 68 | return 0; |
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| 69 | #endif /* __riscv_flen */ |
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| 70 | } |
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| 71 | |
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| 72 | fp_except |
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| 73 | fpsetmask(fp_except mask) |
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| 74 | { |
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| 75 | return -1; |
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| 76 | } |
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| 77 | |
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| 78 | fp_rnd |
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| 79 | fpsetround(fp_rnd rnd_dir) |
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| 80 | { |
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| 81 | #ifdef __riscv_flen |
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| 82 | unsigned fsr = frsr (); |
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| 83 | unsigned rm = (fsr >> 5) & 0x7; |
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| 84 | unsigned new_rm; |
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| 85 | switch (rnd_dir) |
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| 86 | { |
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| 87 | case FP_RN: new_rm = 0; |
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| 88 | case FP_RZ: new_rm = 1; |
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| 89 | case FP_RM: new_rm = 2; |
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| 90 | case FP_RP: new_rm = 3; |
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| 91 | default: return -1; |
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| 92 | } |
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| 93 | fssr (new_rm << 5 | fsr & 0x1f); |
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| 94 | return frm_fp_rnd (rm); |
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| 95 | #else |
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| 96 | return -1; |
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| 97 | #endif /* __riscv_flen */ |
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| 98 | } |
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| 99 | |
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| 100 | fp_except |
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| 101 | fpsetsticky(fp_except sticky) |
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| 102 | { |
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| 103 | #ifdef __riscv_flen |
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| 104 | unsigned fsr = frsr (); |
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| 105 | fssr (sticky & 0x1f | fsr & ~0x1f); |
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| 106 | return fsr & 0x1f; |
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| 107 | #else |
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| 108 | return -1; |
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| 109 | #endif /* __riscv_flen */ |
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| 110 | } |
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