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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 31/72] softfloat: Move sf_canonicalize to softfloat-parts.c.inc
Date: Fri,  7 May 2021 18:47:21 -0700	[thread overview]
Message-ID: <20210508014802.892561-32-richard.henderson@linaro.org> (raw)
In-Reply-To: <20210508014802.892561-1-richard.henderson@linaro.org>

At the same time, convert to pointers, rename to parts$N_canonicalize
and define a macro for parts_canonicalize using QEMU_GENERIC.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 fpu/softfloat.c           | 117 +++++++++++++++++++++++++-------------
 fpu/softfloat-parts.c.inc |  33 +++++++++++
 2 files changed, 112 insertions(+), 38 deletions(-)

diff --git a/fpu/softfloat.c b/fpu/softfloat.c
index 40ee294e35..bad4b54cd2 100644
--- a/fpu/softfloat.c
+++ b/fpu/softfloat.c
@@ -732,6 +732,14 @@ static FloatParts128 *parts128_pick_nan_muladd(FloatParts128 *a,
 #define parts_pick_nan_muladd(A, B, C, S, ABM, ABCM) \
     PARTS_GENERIC_64_128(pick_nan_muladd, A)(A, B, C, S, ABM, ABCM)
 
+static void parts64_canonicalize(FloatParts64 *p, float_status *status,
+                                 const FloatFmt *fmt);
+static void parts128_canonicalize(FloatParts128 *p, float_status *status,
+                                  const FloatFmt *fmt);
+
+#define parts_canonicalize(A, S, F) \
+    PARTS_GENERIC_64_128(canonicalize, A)(A, S, F)
+
 /*
  * Helper functions for softfloat-parts.c.inc, per-size operations.
  */
@@ -758,52 +766,85 @@ static int frac128_cmp(FloatParts128 *a, FloatParts128 *b)
 
 #define frac_cmp(A, B)  FRAC_GENERIC_64_128(cmp, A)(A, B)
 
+static void frac64_clear(FloatParts64 *a)
+{
+    a->frac = 0;
+}
+
+static void frac128_clear(FloatParts128 *a)
+{
+    a->frac_hi = a->frac_lo = 0;
+}
+
+#define frac_clear(A)  FRAC_GENERIC_64_128(clear, A)(A)
+
+static bool frac64_eqz(FloatParts64 *a)
+{
+    return a->frac == 0;
+}
+
+static bool frac128_eqz(FloatParts128 *a)
+{
+    return (a->frac_hi | a->frac_lo) == 0;
+}
+
+#define frac_eqz(A)  FRAC_GENERIC_64_128(eqz, A)(A)
+
+static int frac64_normalize(FloatParts64 *a)
+{
+    if (a->frac) {
+        int shift = clz64(a->frac);
+        a->frac <<= shift;
+        return shift;
+    }
+    return 64;
+}
+
+static int frac128_normalize(FloatParts128 *a)
+{
+    if (a->frac_hi) {
+        int shl = clz64(a->frac_hi);
+        if (shl) {
+            int shr = 64 - shl;
+            a->frac_hi = (a->frac_hi << shl) | (a->frac_lo >> shr);
+            a->frac_lo = (a->frac_lo << shl);
+        }
+        return shl;
+    } else if (a->frac_lo) {
+        int shl = clz64(a->frac_lo);
+        a->frac_hi = (a->frac_lo << shl);
+        a->frac_lo = 0;
+        return shl + 64;
+    }
+    return 128;
+}
+
+#define frac_normalize(A)  FRAC_GENERIC_64_128(normalize, A)(A)
+
+static void frac64_shl(FloatParts64 *a, int c)
+{
+    a->frac <<= c;
+}
+
 static void frac128_shl(FloatParts128 *a, int c)
 {
     shift128Left(a->frac_hi, a->frac_lo, c, &a->frac_hi, &a->frac_lo);
 }
 
-#define frac_shl(A, C)             frac128_shl(A, C)
+#define frac_shl(A, C)  FRAC_GENERIC_64_128(shl, A)(A, C)
+
+static void frac64_shr(FloatParts64 *a, int c)
+{
+    a->frac >>= c;
+}
 
 static void frac128_shr(FloatParts128 *a, int c)
 {
     shift128Right(a->frac_hi, a->frac_lo, c, &a->frac_hi, &a->frac_lo);
 }
 
-#define frac_shr(A, C)             frac128_shr(A, C)
+#define frac_shr(A, C)  FRAC_GENERIC_64_128(shr, A)(A, C)
 
-/* Canonicalize EXP and FRAC, setting CLS.  */
-static FloatParts64 sf_canonicalize(FloatParts64 part, const FloatFmt *parm,
-                                  float_status *status)
-{
-    if (part.exp == parm->exp_max && !parm->arm_althp) {
-        if (part.frac == 0) {
-            part.cls = float_class_inf;
-        } else {
-            part.frac <<= parm->frac_shift;
-            part.cls = (parts_is_snan_frac(part.frac, status)
-                        ? float_class_snan : float_class_qnan);
-        }
-    } else if (part.exp == 0) {
-        if (likely(part.frac == 0)) {
-            part.cls = float_class_zero;
-        } else if (status->flush_inputs_to_zero) {
-            float_raise(float_flag_input_denormal, status);
-            part.cls = float_class_zero;
-            part.frac = 0;
-        } else {
-            int shift = clz64(part.frac);
-            part.cls = float_class_normal;
-            part.exp = parm->frac_shift - parm->exp_bias - shift + 1;
-            part.frac <<= shift;
-        }
-    } else {
-        part.cls = float_class_normal;
-        part.exp -= parm->exp_bias;
-        part.frac = DECOMPOSED_IMPLICIT_BIT + (part.frac << parm->frac_shift);
-    }
-    return part;
-}
 
 /* Round and uncanonicalize a floating-point number by parts. There
  * are FRAC_SHIFT bits that may require rounding at the bottom of the
@@ -983,7 +1024,7 @@ static void float16a_unpack_canonical(FloatParts64 *p, float16 f,
                                       float_status *s, const FloatFmt *params)
 {
     float16_unpack_raw(p, f);
-    *p = sf_canonicalize(*p, params, s);
+    parts_canonicalize(p, s, params);
 }
 
 static void float16_unpack_canonical(FloatParts64 *p, float16 f,
@@ -996,7 +1037,7 @@ static void bfloat16_unpack_canonical(FloatParts64 *p, bfloat16 f,
                                       float_status *s)
 {
     bfloat16_unpack_raw(p, f);
-    *p = sf_canonicalize(*p, &bfloat16_params, s);
+    parts_canonicalize(p, s, &bfloat16_params);
 }
 
 static float16 float16a_round_pack_canonical(FloatParts64 *p,
@@ -1024,7 +1065,7 @@ static void float32_unpack_canonical(FloatParts64 *p, float32 f,
                                      float_status *s)
 {
     float32_unpack_raw(p, f);
-    *p = sf_canonicalize(*p, &float32_params, s);
+    parts_canonicalize(p, s, &float32_params);
 }
 
 static float32 float32_round_pack_canonical(FloatParts64 *p,
@@ -1038,7 +1079,7 @@ static void float64_unpack_canonical(FloatParts64 *p, float64 f,
                                      float_status *s)
 {
     float64_unpack_raw(p, f);
-    *p = sf_canonicalize(*p, &float64_params, s);
+    parts_canonicalize(p, s, &float64_params);
 }
 
 static float64 float64_round_pack_canonical(FloatParts64 *p,
diff --git a/fpu/softfloat-parts.c.inc b/fpu/softfloat-parts.c.inc
index a78d61ea07..25bf99bd0f 100644
--- a/fpu/softfloat-parts.c.inc
+++ b/fpu/softfloat-parts.c.inc
@@ -100,3 +100,36 @@ static FloatPartsN *partsN(pick_nan_muladd)(FloatPartsN *a, FloatPartsN *b,
     }
     return a;
 }
+
+/*
+ * Canonicalize the FloatParts structure.  Determine the class,
+ * unbias the exponent, and normalize the fraction.
+ */
+static void partsN(canonicalize)(FloatPartsN *p, float_status *status,
+                                 const FloatFmt *fmt)
+{
+    if (unlikely(p->exp == 0)) {
+        if (likely(frac_eqz(p))) {
+            p->cls = float_class_zero;
+        } else if (status->flush_inputs_to_zero) {
+            float_raise(float_flag_input_denormal, status);
+            p->cls = float_class_zero;
+            frac_clear(p);
+        } else {
+            int shift = frac_normalize(p);
+            p->cls = float_class_normal;
+            p->exp = fmt->frac_shift - fmt->exp_bias - shift + 1;
+        }
+    } else if (likely(p->exp < fmt->exp_max) || fmt->arm_althp) {
+        p->cls = float_class_normal;
+        p->exp -= fmt->exp_bias;
+        frac_shl(p, fmt->frac_shift);
+        p->frac_hi |= DECOMPOSED_IMPLICIT_BIT;
+    } else if (likely(frac_eqz(p))) {
+        p->cls = float_class_inf;
+    } else {
+        frac_shl(p, fmt->frac_shift);
+        p->cls = (parts_is_snan_frac(p->frac_hi, status)
+                  ? float_class_snan : float_class_qnan);
+    }
+}
-- 
2.25.1



  parent reply	other threads:[~2021-05-08  2:17 UTC|newest]

Thread overview: 151+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-08  1:46 [PATCH 00/72] Convert floatx80 and float128 to FloatParts Richard Henderson
2021-05-08  1:46 ` [PATCH 01/72] qemu/host-utils: Use __builtin_bitreverseN Richard Henderson
2021-05-10  9:59   ` Alex Bennée
2021-05-11  9:41   ` David Hildenbrand
2021-05-08  1:46 ` [PATCH 02/72] qemu/host-utils: Add wrappers for overflow builtins Richard Henderson
2021-05-10 10:22   ` Alex Bennée
2021-05-08  1:46 ` [PATCH 03/72] qemu/host-utils: Add wrappers for carry builtins Richard Henderson
2021-05-10 12:57   ` Alex Bennée
2021-05-11 20:10     ` Richard Henderson
2021-05-12 11:17       ` Alex Bennée
2021-05-08  1:46 ` [PATCH 04/72] accel/tcg: Use add/sub overflow routines in tcg-runtime-gvec.c Richard Henderson
2021-05-09  8:43   ` Philippe Mathieu-Daudé
2021-05-10 13:02   ` Alex Bennée
2021-05-11  9:46   ` David Hildenbrand
2021-05-08  1:46 ` [PATCH 05/72] tests/fp: add quad support to the benchmark utility Richard Henderson
2021-05-11 10:01   ` David Hildenbrand
2021-05-08  1:46 ` [PATCH 06/72] softfloat: Move the binary point to the msb Richard Henderson
2021-05-10 13:36   ` Alex Bennée
2021-05-08  1:46 ` [PATCH 07/72] softfloat: Inline float_raise Richard Henderson
2021-05-09  8:32   ` Philippe Mathieu-Daudé
2021-05-11 10:04   ` David Hildenbrand
2021-05-08  1:46 ` [PATCH 08/72] softfloat: Use float_raise in more places Richard Henderson
2021-05-09  8:34   ` Philippe Mathieu-Daudé
2021-05-11 10:06   ` David Hildenbrand
2021-05-08  1:46 ` [PATCH 09/72] softfloat: Tidy a * b + inf return Richard Henderson
2021-05-08  1:47 ` [PATCH 10/72] softfloat: Add float_cmask and constants Richard Henderson
2021-05-08  1:47 ` [PATCH 11/72] softfloat: Use return_nan in float_to_float Richard Henderson
2021-05-10 15:10   ` Alex Bennée
2021-05-11 10:10   ` David Hildenbrand
2021-05-08  1:47 ` [PATCH 12/72] softfloat: fix return_nan vs default_nan_mode Richard Henderson
2021-05-10 15:12   ` Alex Bennée
2021-05-11 10:12   ` David Hildenbrand
2021-05-08  1:47 ` [PATCH 13/72] target/mips: Set set_default_nan_mode with set_snan_bit_is_one Richard Henderson
2021-05-11  9:37   ` Alex Bennée
2021-05-11 10:16   ` David Hildenbrand
2021-05-08  1:47 ` [PATCH 14/72] softfloat: Do not produce a default_nan from parts_silence_nan Richard Henderson
2021-05-11 10:16   ` David Hildenbrand
2021-05-11 10:32   ` Alex Bennée
2021-05-08  1:47 ` [PATCH 15/72] softfloat: Rename FloatParts to FloatParts64 Richard Henderson
2021-05-09  8:45   ` Philippe Mathieu-Daudé
2021-05-11 10:16   ` David Hildenbrand
2021-05-08  1:47 ` [PATCH 16/72] softfloat: Move type-specific pack/unpack routines Richard Henderson
2021-05-09  8:46   ` Philippe Mathieu-Daudé
2021-05-11 10:17   ` David Hildenbrand
2021-05-08  1:47 ` [PATCH 17/72] softfloat: Use pointers with parts_default_nan Richard Henderson
2021-05-11 10:22   ` David Hildenbrand
2021-05-11 20:19     ` Richard Henderson
2021-05-08  1:47 ` [PATCH 18/72] softfloat: Use pointers with unpack_raw Richard Henderson
2021-05-09  8:48   ` Philippe Mathieu-Daudé
2021-05-12 12:58   ` Alex Bennée
2021-05-08  1:47 ` [PATCH 19/72] softfloat: Use pointers with ftype_unpack_raw Richard Henderson
2021-05-11 11:31   ` Alex Bennée
2021-05-08  1:47 ` [PATCH 20/72] softfloat: Use pointers with pack_raw Richard Henderson
2021-05-11 11:32   ` Alex Bennée
2021-05-08  1:47 ` [PATCH 21/72] softfloat: Use pointers with ftype_pack_raw Richard Henderson
2021-05-11 11:32   ` Alex Bennée
2021-05-08  1:47 ` [PATCH 22/72] softfloat: Use pointers with ftype_unpack_canonical Richard Henderson
2021-05-11 13:54   ` Alex Bennée
2021-05-08  1:47 ` [PATCH 23/72] softfloat: Use pointers with ftype_round_pack_canonical Richard Henderson
2021-05-11 13:55   ` Alex Bennée
2021-05-08  1:47 ` [PATCH 24/72] softfloat: Use pointers with parts_silence_nan Richard Henderson
2021-05-11 13:56   ` Alex Bennée
2021-05-08  1:47 ` [PATCH 25/72] softfloat: Rearrange FloatParts64 Richard Henderson
2021-05-11 13:57   ` Alex Bennée
2021-05-11 15:04     ` Richard Henderson
2021-05-12 11:08       ` Alex Bennée
2021-05-08  1:47 ` [PATCH 26/72] softfloat: Convert float128_silence_nan to parts Richard Henderson
2021-05-13  8:34   ` Alex Bennée
2021-05-13 12:25     ` Richard Henderson
2021-05-08  1:47 ` [PATCH 27/72] softfloat: Convert float128_default_nan " Richard Henderson
2021-05-13  8:56   ` Alex Bennée
2021-05-08  1:47 ` [PATCH 28/72] softfloat: Move return_nan to softfloat-parts.c.inc Richard Henderson
2021-05-12 18:10   ` David Hildenbrand
2021-05-08  1:47 ` [PATCH 29/72] softfloat: Move pick_nan " Richard Henderson
2021-05-12 18:16   ` David Hildenbrand
2021-05-13 12:28     ` Richard Henderson
2021-05-08  1:47 ` [PATCH 30/72] softfloat: Move pick_nan_muladd " Richard Henderson
2021-05-12 18:18   ` David Hildenbrand
2021-05-08  1:47 ` Richard Henderson [this message]
2021-05-13  9:45   ` [PATCH 31/72] softfloat: Move sf_canonicalize " Alex Bennée
2021-05-08  1:47 ` [PATCH 32/72] softfloat: Move round_canonical " Richard Henderson
2021-05-13  9:53   ` Alex Bennée
2021-05-08  1:47 ` [PATCH 33/72] softfloat: Use uadd64_carry, usub64_borrow in softfloat-macros.h Richard Henderson
2021-05-13 10:00   ` Alex Bennée
2021-05-13 12:38     ` Richard Henderson
2021-05-08  1:47 ` [PATCH 34/72] softfloat: Move addsub_floats to softfloat-parts.c.inc Richard Henderson
2021-05-13 10:03   ` Alex Bennée
2021-05-13 10:05   ` Alex Bennée
2021-05-08  1:47 ` [PATCH 35/72] softfloat: Implement float128_add/sub via parts Richard Henderson
2021-05-13 10:06   ` Alex Bennée
2021-05-08  1:47 ` [PATCH 36/72] softfloat: Move mul_floats to softfloat-parts.c.inc Richard Henderson
2021-05-13 10:08   ` Alex Bennée
2021-05-08  1:47 ` [PATCH 37/72] softfloat: Move muladd_floats " Richard Henderson
2021-05-13 10:43   ` Alex Bennée
2021-05-08  1:47 ` [PATCH 38/72] softfloat: Use mulu64 for mul64To128 Richard Henderson
2021-05-08  1:47 ` [PATCH 39/72] softfloat: Use add192 in mul128To256 Richard Henderson
2021-05-13 10:49   ` Alex Bennée
2021-05-08  1:47 ` [PATCH 40/72] softfloat: Tidy mul128By64To192 Richard Henderson
2021-05-13 10:50   ` Alex Bennée
2021-05-08  1:47 ` [PATCH 41/72] softfloat: Introduce sh[lr]_double primitives Richard Henderson
2021-05-13 10:59   ` Alex Bennée
2021-05-08  1:47 ` [PATCH 42/72] softfloat: Move div_floats to softfloat-parts.c.inc Richard Henderson
2021-05-13 11:02   ` Alex Bennée
2021-05-08  1:47 ` [PATCH 43/72] softfloat: Split float_to_float Richard Henderson
2021-05-13 11:04   ` Alex Bennée
2021-05-08  1:47 ` [PATCH 44/72] softfloat: Convert float-to-float conversions with float128 Richard Henderson
2021-05-13 11:17   ` Alex Bennée
2021-05-08  1:47 ` [PATCH 45/72] softfloat: Move round_to_int to softfloat-parts.c.inc Richard Henderson
2021-05-13 14:10   ` Alex Bennée
2021-05-08  1:47 ` [PATCH 46/72] softfloat: Move rount_to_int_and_pack " Richard Henderson
2021-05-13 14:11   ` Alex Bennée
2021-05-08  1:47 ` [PATCH 47/72] softfloat: Move rount_to_uint_and_pack " Richard Henderson
2021-05-08  1:47 ` [PATCH 48/72] softfloat: Move int_to_float " Richard Henderson
2021-05-08  1:47 ` [PATCH 49/72] softfloat: Move uint_to_float " Richard Henderson
2021-05-08  1:47 ` [PATCH 50/72] softfloat: Move minmax_flags " Richard Henderson
2021-05-17 13:14   ` David Hildenbrand
2021-05-17 15:57     ` Richard Henderson
2021-05-08  1:47 ` [PATCH 51/72] softfloat: Move compare_floats " Richard Henderson
2021-05-08  1:47 ` [PATCH 52/72] softfloat: Move scalbn_decomposed " Richard Henderson
2021-05-08  1:47 ` [PATCH 53/72] softfloat: Move sqrt_float " Richard Henderson
2021-05-08  1:47 ` [PATCH 54/72] softfloat: Split out parts_uncanon_normal Richard Henderson
2021-05-08  1:47 ` [PATCH 55/72] softfloat: Reduce FloatFmt Richard Henderson
2021-05-08  1:47 ` [PATCH 56/72] softfloat: Introduce Floatx80RoundPrec Richard Henderson
2021-05-08  1:47 ` [PATCH 57/72] softfloat: Adjust parts_uncanon_normal for floatx80 Richard Henderson
2021-05-08  1:47 ` [PATCH 58/72] tests/fp/fp-test: Reverse order of floatx80 precision tests Richard Henderson
2021-05-13 14:12   ` Alex Bennée
2021-05-08  1:47 ` [PATCH 59/72] softfloat: Convert floatx80_add/sub to FloatParts Richard Henderson
2021-05-08  1:47 ` [PATCH 60/72] softfloat: Convert floatx80_mul " Richard Henderson
2021-05-08  1:47 ` [PATCH 61/72] softfloat: Convert floatx80_div " Richard Henderson
2021-05-08  1:47 ` [PATCH 62/72] softfloat: Convert floatx80_sqrt " Richard Henderson
2021-05-08  1:47 ` [PATCH 63/72] softfloat: Convert floatx80_round " Richard Henderson
2021-05-08  1:47 ` [PATCH 64/72] softfloat: Convert floatx80_round_to_int " Richard Henderson
2021-05-08  1:47 ` [PATCH 65/72] softfloat: Convert integer to floatx80 " Richard Henderson
2021-05-08  1:47 ` [PATCH 66/72] softfloat: Convert floatx80 float conversions " Richard Henderson
2021-05-08  1:47 ` [PATCH 67/72] softfloat: Convert floatx80 to integer " Richard Henderson
2021-05-08  1:47 ` [PATCH 68/72] softfloat: Convert floatx80_scalbn " Richard Henderson
2021-05-08  1:47 ` [PATCH 69/72] softfloat: Convert floatx80 compare " Richard Henderson
2021-05-08  1:48 ` [PATCH 70/72] softfloat: Convert float32_exp2 " Richard Henderson
2021-05-08  1:48 ` [PATCH 71/72] softfloat: Move floatN_log2 to softfloat-parts.c.inc Richard Henderson
2021-05-08  1:48 ` [PATCH 72/72] softfloat: Convert modrem operations to FloatParts Richard Henderson
2021-05-08  2:52 ` [PATCH 00/72] Convert floatx80 and float128 " no-reply
2021-05-10 13:36 ` Alex Bennée
2021-05-12  1:52   ` Richard Henderson
2021-05-12 11:22     ` Alex Bennée
2021-05-12 15:28       ` Richard Henderson
2021-05-12 16:47 ` Alex Bennée
2021-05-12 19:23 ` Alex Bennée
2021-05-13 11:49   ` Richard Henderson
2021-05-13 13:33     ` Alex Bennée
2021-05-13 23:54       ` Richard Henderson
2021-05-13 14:13 ` Alex Bennée

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