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[Qemu-devel] [PATCH 12/24] fpu/soft-fp: Add ties_away and to_odd roundin
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From: |
Richard Henderson |
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Subject: |
[Qemu-devel] [PATCH 12/24] fpu/soft-fp: Add ties_away and to_odd rounding modes |
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Date: |
Sat, 3 Feb 2018 20:11:24 -0800 |
These rounding modes are used by ARM and PowerPC respectively.
Signed-off-by: Richard Henderson <address@hidden>
---
fpu/op-common.h | 20 ++++++++++++++++++++
fpu/soft-fp.h | 25 +++++++++++++++++++++++++
2 files changed, 45 insertions(+)
diff --git a/fpu/op-common.h b/fpu/op-common.h
index 4526afd1b6..c5f33c0148 100644
--- a/fpu/op-common.h
+++ b/fpu/op-common.h
@@ -130,6 +130,7 @@
do \
{ \
if (FP_ROUNDMODE == FP_RND_NEAREST \
+ || FP_ROUNDMODE == FP_RND_TIESAWAY \
|| (FP_ROUNDMODE == FP_RND_PINF && !X##_s) \
|| (FP_ROUNDMODE == FP_RND_MINF && X##_s)) \
{ \
@@ -287,6 +288,7 @@
switch (FP_ROUNDMODE) \
{ \
case FP_RND_NEAREST: \
+ case FP_RND_TIESAWAY: \
X##_c = FP_CLS_INF; \
break; \
case FP_RND_PINF: \
@@ -297,6 +299,10 @@
if (X##_s) \
X##_c = FP_CLS_INF; \
break; \
+ case FP_RND_ODD: \
+ break; \
+ default: \
+ _FP_UNREACHABLE; \
} \
if (X##_c == FP_CLS_INF) \
{ \
@@ -1610,10 +1616,14 @@
switch (FP_ROUNDMODE) \
{ \
case FP_RND_NEAREST: \
+ case FP_RND_TIESAWAY: \
_FP_TO_INT_ROUND_rounds_away \
= (X##_e == _FP_EXPBIAS_##fs - 1 \
&& !_FP_FRAC_ZEROP_##wc (X)); \
break; \
+ case FP_RND_ODD: \
+ _FP_TO_INT_ROUND_rounds_away = 1; \
+ break; \
case FP_RND_ZERO: \
/* _FP_TO_INT_ROUND_rounds_away is already 0. */ \
break; \
@@ -1623,6 +1633,8 @@
case FP_RND_MINF: \
_FP_TO_INT_ROUND_rounds_away = X##_s; \
break; \
+ default: \
+ _FP_UNREACHABLE; \
} \
if ((rsigned) == 0 && _FP_TO_INT_ROUND_rounds_away && X##_s) \
{ \
@@ -1740,6 +1752,14 @@
case FP_RND_MINF: \
_FP_ROUND_MINF (wc, X); \
break; \
+ case FP_RND_TIESAWAY: \
+ _FP_ROUND_TIESAWAY (wc, X); \
+ break; \
+ case FP_RND_ODD: \
+ _FP_ROUND_ODD (wc, X); \
+ break; \
+ default: \
+ _FP_UNREACHABLE; \
} \
} \
_FP_FRAC_SRL_##wc (X, _FP_WORKBITS); \
diff --git a/fpu/soft-fp.h b/fpu/soft-fp.h
index a7a01334b7..a95485f465 100644
--- a/fpu/soft-fp.h
+++ b/fpu/soft-fp.h
@@ -93,6 +93,8 @@
# define FP_RND_ZERO 1
# define FP_RND_PINF 2
# define FP_RND_MINF 3
+# define FP_RND_TIESAWAY 4
+# define FP_RND_ODD 5
#endif
#ifndef FP_ROUNDMODE
# define FP_ROUNDMODE FP_RND_NEAREST
@@ -282,6 +284,21 @@
} \
while (0)
+#define _FP_ROUND_TIESAWAY(wc, X) \
+ do \
+ { \
+ _FP_FRAC_ADDI_##wc (X, _FP_WORK_ROUND); \
+ } \
+ while (0)
+
+#define _FP_ROUND_ODD(wc, X) \
+ do \
+ { \
+ if (!(_FP_FRAC_LOW_##wc (X) & _FP_WORK_LSB)) \
+ _FP_FRAC_ADDI_##wc (X, _FP_WORK_LSB - 1); \
+ } \
+ while (0)
+
#define _FP_ROUND(wc, X) \
do \
{ \
@@ -302,6 +319,14 @@
case FP_RND_MINF: \
_FP_ROUND_MINF (wc, X); \
break; \
+ case FP_RND_TIESAWAY: \
+ _FP_ROUND_TIESAWAY (wc, X); \
+ break; \
+ case FP_RND_ODD: \
+ _FP_ROUND_ODD (wc, X); \
+ break; \
+ default: \
+ _FP_UNREACHABLE; \
} \
} \
} \
--
2.14.3
- [Qemu-devel] [PATCH 01/24] fpu/softfloat: implement float16_squash_input_denormal, (continued)
- [Qemu-devel] [PATCH 01/24] fpu/softfloat: implement float16_squash_input_denormal, Richard Henderson, 2018/02/03
- [Qemu-devel] [PATCH 02/24] include/fpu/softfloat: remove USE_SOFTFLOAT_STRUCT_TYPES, Richard Henderson, 2018/02/03
- [Qemu-devel] [PATCH 03/24] fpu/softfloat-types: new header to prevent excessive re-builds, Richard Henderson, 2018/02/03
- [Qemu-devel] [PATCH 05/24] include/fpu/softfloat: implement float16_abs helper, Richard Henderson, 2018/02/03
- [Qemu-devel] [PATCH 06/24] include/fpu/softfloat: implement float16_chs helper, Richard Henderson, 2018/02/03
- [Qemu-devel] [PATCH 04/24] target/*/cpu.h: remove softfloat.h, Richard Henderson, 2018/02/03
- [Qemu-devel] [PATCH 07/24] include/fpu/softfloat: implement float16_set_sign helper, Richard Henderson, 2018/02/03
- [Qemu-devel] [PATCH 08/24] include/fpu/softfloat: add some float16 constants, Richard Henderson, 2018/02/03
- [Qemu-devel] [PATCH 11/24] fpu/soft-fp: Adjust soft-fp types, Richard Henderson, 2018/02/03
- [Qemu-devel] [PATCH 09/24] fpu/softfloat: improve comments on ARM NaN propagation, Richard Henderson, 2018/02/03
- [Qemu-devel] [PATCH 12/24] fpu/soft-fp: Add ties_away and to_odd rounding modes,
Richard Henderson <=
- [Qemu-devel] [PATCH 13/24] fpu/soft-fp: Add arithmetic macros to half.h, Richard Henderson, 2018/02/03
- [Qemu-devel] [PATCH 14/24] fpu/soft-fp: Adjust _FP_CMP_CHECK_NAN, Richard Henderson, 2018/02/03
- [Qemu-devel] [PATCH 19/24] fpu: Implement min/max with soft-fp.h, Richard Henderson, 2018/02/03
- [Qemu-devel] [PATCH 17/24] fpu: Implement int/uint_to_float with soft-fp.h, Richard Henderson, 2018/02/03
- [Qemu-devel] [PATCH 21/24] fpu: Implement scalbn with soft-fp.h, Richard Henderson, 2018/02/03
- [Qemu-devel] [PATCH 20/24] fpu: Implement sqrt with soft-fp.h, Richard Henderson, 2018/02/03
- [Qemu-devel] [PATCH 16/24] fpu: Implement float_to_int/uint with soft-fp.h, Richard Henderson, 2018/02/03
- [Qemu-devel] [PATCH 15/24] fpu: Implement add/sub/mul/div with soft-fp.h, Richard Henderson, 2018/02/03
- [Qemu-devel] [PATCH 18/24] fpu: Implement compares with soft-fp.h, Richard Henderson, 2018/02/03
- [Qemu-devel] [PATCH 22/24] fpu: Implement float_to_float with soft-fp.h, Richard Henderson, 2018/02/03