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[27/72] softfloat: Convert float128_default_nan to parts

Message ID 20210508014802.892561-28-richard.henderson@linaro.org (mailing list archive)
State New, archived
Headers show
Series Convert floatx80 and float128 to FloatParts | expand

Commit Message

Richard Henderson May 8, 2021, 1:47 a.m. UTC 
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 fpu/softfloat.c                | 17 ++++-------------
 fpu/softfloat-specialize.c.inc | 19 +++++++++++++++++++
 2 files changed, 23 insertions(+), 13 deletions(-)

Comments

Alex Bennée May 13, 2021, 8:56 a.m. UTC | #1 
Richard Henderson <richard.henderson@linaro.org> writes:

> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
diff mbox series

Patch

diff --git a/fpu/softfloat.c b/fpu/softfloat.c
index 073b80d502..6d5392aeab 100644
--- a/fpu/softfloat.c
+++ b/fpu/softfloat.c
@@ -705,7 +705,7 @@  static float128 float128_pack_raw(const FloatParts128 *p)
 #define PARTS_GENERIC_64_128(NAME, P) \
     QEMU_GENERIC(P, (FloatParts128 *, parts128_##NAME), parts64_##NAME)
 
-#define parts_default_nan  parts64_default_nan
+#define parts_default_nan(P, S)    PARTS_GENERIC_64_128(default_nan, P)(P, S)
 #define parts_silence_nan(P, S)    PARTS_GENERIC_64_128(silence_nan, P)(P, S)
 
 
@@ -3836,20 +3836,11 @@  float64 float64_default_nan(float_status *status)
 
 float128 float128_default_nan(float_status *status)
 {
-    FloatParts64 p;
-    float128 r;
+    FloatParts128 p;
 
     parts_default_nan(&p, status);
-    /* Extrapolate from the choices made by parts_default_nan to fill
-     * in the quad-floating format.  If the low bit is set, assume we
-     * want to set all non-snan bits.
-     */
-    r.low = -(p.frac & 1);
-    r.high = p.frac >> (DECOMPOSED_BINARY_POINT - 48);
-    r.high |= UINT64_C(0x7FFF000000000000);
-    r.high |= (uint64_t)p.sign << 63;
-
-    return r;
+    frac_shr(&p, float128_params.frac_shift);
+    return float128_pack_raw(&p);
 }
 
 bfloat16 bfloat16_default_nan(float_status *status)
diff --git a/fpu/softfloat-specialize.c.inc b/fpu/softfloat-specialize.c.inc
index d892016f0f..a0cf016b4f 100644
--- a/fpu/softfloat-specialize.c.inc
+++ b/fpu/softfloat-specialize.c.inc
@@ -172,6 +172,25 @@  static void parts64_default_nan(FloatParts64 *p, float_status *status)
     };
 }
 
+static void parts128_default_nan(FloatParts128 *p, float_status *status)
+{
+    /*
+     * Extrapolate from the choices made by parts64_default_nan to fill
+     * in the quad-floating format.  If the low bit is set, assume we
+     * want to set all non-snan bits.
+     */
+    FloatParts64 p64;
+    parts64_default_nan(&p64, status);
+
+    *p = (FloatParts128) {
+        .cls = float_class_qnan,
+        .sign = p64.sign,
+        .exp = INT_MAX,
+        .frac_hi = p64.frac,
+        .frac_lo = -(p64.frac & 1)
+    };
+}
+
 /*----------------------------------------------------------------------------
 | Returns a quiet NaN from a signalling NaN for the deconstructed
 | floating-point parts.