[05/17] softfloat: Add float_round_nearest_even_max

Commit Message

Richard Henderson Dec. 8, 2024, 10:48 p.m. UTC

This rounding mode is used by Hexagon.

Signed-off-by: Richard Henderson <[e-mail]>
---
 include/fpu/softfloat-types.h | 2 ++
 fpu/softfloat-parts.c.inc     | 3 +++
 2 files changed, 5 insertions(+)

Patch

diff --git a/include/fpu/softfloat-types.h b/include/fpu/softfloat-types.h
index 8f39691dfd..c6429665ce 100644
--- a/include/fpu/softfloat-types.h
+++ b/include/fpu/softfloat-types.h
@@ -138,6 +138,8 @@  typedef enum __attribute__((__packed__)) {
     float_round_to_odd       = 5,
     /* Not an IEEE rounding mode: round to closest odd, overflow to inf */
     float_round_to_odd_inf   = 6,
+    /* Not an IEEE rounding mode: round to nearest even, overflow to max */
+    float_round_nearest_even_max = 7,
 } FloatRoundMode;
 
 /*
diff --git a/fpu/softfloat-parts.c.inc b/fpu/softfloat-parts.c.inc
index 5b5969725b..2b6adeef4c 100644
--- a/fpu/softfloat-parts.c.inc
+++ b/fpu/softfloat-parts.c.inc
@@ -155,6 +155,9 @@  static void partsN(uncanon_normal)(FloatPartsN *p, float_status *s,
     int exp, flags = 0;
 
     switch (s->float_rounding_mode) {
+    case float_round_nearest_even_max:
+        overflow_norm = true;
+        /* fall through */
     case float_round_nearest_even:
         if (N > 64 && frac_lsb == 0) {
             inc = ((p->frac_hi & 1) || (p->frac_lo & round_mask) != frac_lsbm1