[RFC,12/15] softfloat: Streamline FloatFmt

Commit Message

Richard Henderson Oct. 21, 2020, 4:51 a.m. UTC

The fields being removed are now computed in round_canonical.

Signed-off-by: Richard Henderson <[e-mail]>
---
 fpu/softfloat.c | 14 +-------------
 1 file changed, 1 insertion(+), 13 deletions(-)

Patch

diff --git a/fpu/softfloat.c b/fpu/softfloat.c
index 3651f4525d..1bd21435e7 100644
--- a/fpu/softfloat.c
+++ b/fpu/softfloat.c
@@ -527,10 +527,6 @@  typedef struct {
  *   exp_max: the maximum normalised exponent
  *   frac_size: the size of the fraction field
  *   frac_shift: shift to normalise the fraction with DECOMPOSED_BINARY_POINT
- * The following are computed based the size of fraction
- *   frac_lsb: least significant bit of fraction
- *   frac_lsbm1: the bit below the least significant bit (for rounding)
- *   round_mask/roundeven_mask: masks used for rounding
  * The following optional modifiers are available:
  *   arm_althp: handle ARM Alternative Half Precision
  */
@@ -540,10 +536,6 @@  typedef struct {
     int exp_max;
     int frac_size;
     int frac_shift;
-    uint64_t frac_lsb;
-    uint64_t frac_lsbm1;
-    uint64_t round_mask;
-    uint64_t roundeven_mask;
     bool arm_althp;
 } FloatFmt;
 
@@ -553,11 +545,7 @@  typedef struct {
     .exp_bias       = ((1 << E) - 1) >> 1,                           \
     .exp_max        = (1 << E) - 1,                                  \
     .frac_size      = F,                                             \
-    .frac_shift     = DECOMPOSED_BINARY_POINT - F,                   \
-    .frac_lsb       = 1ull << (DECOMPOSED_BINARY_POINT - F),         \
-    .frac_lsbm1     = 1ull << ((DECOMPOSED_BINARY_POINT - F) - 1),   \
-    .round_mask     = (1ull << (DECOMPOSED_BINARY_POINT - F)) - 1,   \
-    .roundeven_mask = (2ull << (DECOMPOSED_BINARY_POINT - F)) - 1
+    .frac_shift     = DECOMPOSED_BINARY_POINT - F
 
 static const FloatFmt float16_params = {
     FLOAT_PARAMS(5, 10)