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From: Richard Henderson <richard.henderson@linaro.org>
To: qemu-devel@nongnu.org
Cc: alex.bennee@linaro.org, david@redhat.com
Subject: [PATCH v2 18/28] softfloat: Convert floatx80_round_to_int to FloatParts
Date: Tue, 25 May 2021 08:06:56 -0700	[thread overview]
Message-ID: <20210525150706.294968-19-richard.henderson@linaro.org> (raw)
In-Reply-To: <20210525150706.294968-1-richard.henderson@linaro.org>

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 fpu/softfloat.c | 116 ++++++------------------------------------------
 1 file changed, 13 insertions(+), 103 deletions(-)

diff --git a/fpu/softfloat.c b/fpu/softfloat.c
index 1f7260caec..5c4a32bcfc 100644
--- a/fpu/softfloat.c
+++ b/fpu/softfloat.c
@@ -2610,6 +2610,19 @@ float128 float128_round_to_int(float128 a, float_status *s)
     return float128_round_pack_canonical(&p, s);
 }
 
+floatx80 floatx80_round_to_int(floatx80 a, float_status *status)
+{
+    FloatParts128 p;
+
+    if (!floatx80_unpack_canonical(&p, a, status)) {
+        return floatx80_default_nan(status);
+    }
+
+    parts_round_to_int(&p, status->float_rounding_mode, 0, status,
+                       &floatx80_params[status->floatx80_rounding_precision]);
+    return floatx80_round_pack_canonical(&p, status);
+}
+
 /*
  * Floating-point to signed integer conversions
  */
@@ -5803,109 +5816,6 @@ floatx80 floatx80_round(floatx80 a, float_status *status)
     return floatx80_round_pack_canonical(&p, status);
 }
 
-/*----------------------------------------------------------------------------
-| Rounds the extended double-precision floating-point value `a' to an integer,
-| and returns the result as an extended quadruple-precision floating-point
-| value.  The operation is performed according to the IEC/IEEE Standard for
-| Binary Floating-Point Arithmetic.
-*----------------------------------------------------------------------------*/
-
-floatx80 floatx80_round_to_int(floatx80 a, float_status *status)
-{
-    bool aSign;
-    int32_t aExp;
-    uint64_t lastBitMask, roundBitsMask;
-    floatx80 z;
-
-    if (floatx80_invalid_encoding(a)) {
-        float_raise(float_flag_invalid, status);
-        return floatx80_default_nan(status);
-    }
-    aExp = extractFloatx80Exp( a );
-    if ( 0x403E <= aExp ) {
-        if ( ( aExp == 0x7FFF ) && (uint64_t) ( extractFloatx80Frac( a )<<1 ) ) {
-            return propagateFloatx80NaN(a, a, status);
-        }
-        return a;
-    }
-    if ( aExp < 0x3FFF ) {
-        if (    ( aExp == 0 )
-             && ( (uint64_t) ( extractFloatx80Frac( a ) ) == 0 ) ) {
-            return a;
-        }
-        float_raise(float_flag_inexact, status);
-        aSign = extractFloatx80Sign( a );
-        switch (status->float_rounding_mode) {
-         case float_round_nearest_even:
-            if ( ( aExp == 0x3FFE ) && (uint64_t) ( extractFloatx80Frac( a )<<1 )
-               ) {
-                return
-                    packFloatx80( aSign, 0x3FFF, UINT64_C(0x8000000000000000));
-            }
-            break;
-        case float_round_ties_away:
-            if (aExp == 0x3FFE) {
-                return packFloatx80(aSign, 0x3FFF, UINT64_C(0x8000000000000000));
-            }
-            break;
-         case float_round_down:
-            return
-                  aSign ?
-                      packFloatx80( 1, 0x3FFF, UINT64_C(0x8000000000000000))
-                : packFloatx80( 0, 0, 0 );
-         case float_round_up:
-            return
-                  aSign ? packFloatx80( 1, 0, 0 )
-                : packFloatx80( 0, 0x3FFF, UINT64_C(0x8000000000000000));
-
-        case float_round_to_zero:
-            break;
-        default:
-            g_assert_not_reached();
-        }
-        return packFloatx80( aSign, 0, 0 );
-    }
-    lastBitMask = 1;
-    lastBitMask <<= 0x403E - aExp;
-    roundBitsMask = lastBitMask - 1;
-    z = a;
-    switch (status->float_rounding_mode) {
-    case float_round_nearest_even:
-        z.low += lastBitMask>>1;
-        if ((z.low & roundBitsMask) == 0) {
-            z.low &= ~lastBitMask;
-        }
-        break;
-    case float_round_ties_away:
-        z.low += lastBitMask >> 1;
-        break;
-    case float_round_to_zero:
-        break;
-    case float_round_up:
-        if (!extractFloatx80Sign(z)) {
-            z.low += roundBitsMask;
-        }
-        break;
-    case float_round_down:
-        if (extractFloatx80Sign(z)) {
-            z.low += roundBitsMask;
-        }
-        break;
-    default:
-        abort();
-    }
-    z.low &= ~ roundBitsMask;
-    if ( z.low == 0 ) {
-        ++z.high;
-        z.low = UINT64_C(0x8000000000000000);
-    }
-    if (z.low != a.low) {
-        float_raise(float_flag_inexact, status);
-    }
-    return z;
-
-}
-
 /*----------------------------------------------------------------------------
 | Returns the remainder of the extended double-precision floating-point value
 | `a' with respect to the corresponding value `b'.  The operation is performed
-- 
2.25.1



  parent reply	other threads:[~2021-05-25 16:34 UTC|newest]

Thread overview: 62+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-25 15:06 [PATCH v2 00/28] Convert floatx80 and float128 " Richard Henderson
2021-05-25 15:06 ` [PATCH v2 01/28] softfloat: Move round_to_uint_and_pack to softfloat-parts.c.inc Richard Henderson
2021-06-02 11:12   ` Alex Bennée
2021-05-25 15:06 ` [PATCH v2 02/28] softfloat: Move int_to_float " Richard Henderson
2021-05-26 13:34   ` David Hildenbrand
2021-06-02 11:14   ` Alex Bennée
2021-05-25 15:06 ` [PATCH v2 03/28] softfloat: Move uint_to_float " Richard Henderson
2021-05-26 13:36   ` David Hildenbrand
2021-06-02 11:31   ` Alex Bennée
2021-06-02 16:28     ` Richard Henderson
2021-05-25 15:06 ` [PATCH v2 04/28] softfloat: Move minmax_flags " Richard Henderson
2021-05-26 13:45   ` David Hildenbrand
2021-06-02 20:36   ` Alex Bennée
2021-06-02 22:23     ` Richard Henderson
2021-06-02 22:29   ` Richard Henderson
2021-05-25 15:06 ` [PATCH v2 05/28] softfloat: Move compare_floats " Richard Henderson
2021-06-03  9:00   ` Alex Bennée
2021-05-25 15:06 ` [PATCH v2 06/28] softfloat: Move scalbn_decomposed " Richard Henderson
2021-06-03  9:01   ` Alex Bennée
2021-05-25 15:06 ` [PATCH v2 07/28] softfloat: Move sqrt_float " Richard Henderson
2021-06-03  9:17   ` Alex Bennée
2021-05-25 15:06 ` [PATCH v2 08/28] softfloat: Split out parts_uncanon_normal Richard Henderson
2021-06-03  9:22   ` Alex Bennée
2021-05-25 15:06 ` [PATCH v2 09/28] softfloat: Reduce FloatFmt Richard Henderson
2021-06-03  9:23   ` Alex Bennée
2021-05-25 15:06 ` [PATCH v2 10/28] softfloat: Introduce Floatx80RoundPrec Richard Henderson
2021-06-03  9:26   ` Alex Bennée
2021-05-25 15:06 ` [PATCH v2 11/28] softfloat: Adjust parts_uncanon_normal for floatx80 Richard Henderson
2021-06-03 11:58   ` Alex Bennée
2021-05-25 15:06 ` [PATCH v2 12/28] tests/fp/fp-test: Reverse order of floatx80 precision tests Richard Henderson
2021-05-25 15:06 ` [PATCH v2 13/28] softfloat: Convert floatx80_add/sub to FloatParts Richard Henderson
2021-06-03 14:23   ` Alex Bennée
2021-05-25 15:06 ` [PATCH v2 14/28] softfloat: Convert floatx80_mul " Richard Henderson
2021-06-03 14:23   ` Alex Bennée
2021-05-25 15:06 ` [PATCH v2 15/28] softfloat: Convert floatx80_div " Richard Henderson
2021-06-03 14:23   ` Alex Bennée
2021-05-25 15:06 ` [PATCH v2 16/28] softfloat: Convert floatx80_sqrt " Richard Henderson
2021-06-03 14:24   ` Alex Bennée
2021-05-25 15:06 ` [PATCH v2 17/28] softfloat: Convert floatx80_round " Richard Henderson
2021-06-03 14:25   ` Alex Bennée
2021-05-25 15:06 ` Richard Henderson [this message]
2021-06-03 14:26   ` [PATCH v2 18/28] softfloat: Convert floatx80_round_to_int " Alex Bennée
2021-05-25 15:06 ` [PATCH v2 19/28] softfloat: Convert integer to floatx80 " Richard Henderson
2021-06-03 14:26   ` Alex Bennée
2021-05-25 15:06 ` [PATCH v2 20/28] softfloat: Convert floatx80 float conversions " Richard Henderson
2021-06-03 14:26   ` Alex Bennée
2021-05-25 15:06 ` [PATCH v2 21/28] softfloat: Convert floatx80 to integer " Richard Henderson
2021-06-03 14:27   ` Alex Bennée
2021-05-25 15:07 ` [PATCH v2 22/28] softfloat: Convert floatx80_scalbn " Richard Henderson
2021-06-03 14:34   ` Alex Bennée
2021-05-25 15:07 ` [PATCH v2 23/28] softfloat: Convert floatx80 compare " Richard Henderson
2021-06-03 14:34   ` Alex Bennée
2021-05-25 15:07 ` [PATCH v2 24/28] softfloat: Convert float32_exp2 " Richard Henderson
2021-06-03 14:44   ` Alex Bennée
2021-05-25 15:07 ` [PATCH v2 25/28] softfloat: Move floatN_log2 to softfloat-parts.c.inc Richard Henderson
2021-06-02 15:28   ` Alex Bennée
2021-05-25 15:07 ` [PATCH v2 26/28] softfloat: Convert modrem operations to FloatParts Richard Henderson
2021-06-03 14:48   ` Alex Bennée
2021-05-25 15:07 ` [PATCH v2 27/28] tests/fp: Enable more tests Richard Henderson
2021-05-25 15:07 ` [PATCH v2 28/28] softfloat: Use hard-float for {u}int64_to_float{32, 64} Richard Henderson
2021-06-03 14:57   ` [PATCH v2 28/28] softfloat: Use hard-float for {u}int64_to_float{32,64} Alex Bennée
2021-05-25 16:51 ` [PATCH v2 00/28] Convert floatx80 and float128 to FloatParts no-reply

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