math-emu: fix floating-point to integer unsigned saturation

The math-emu macros _FP_TO_INT and _FP_TO_INT_ROUND are supposed to
saturate their results for out-of-range arguments, except in the case
rsigned == 2 (when instead the low bits of the result are taken).
However, in the case rsigned == 0 (converting to unsigned integers),
they mistakenly produce 0 for positive results and the maximum
unsigned integer for negative results, the opposite of correct
unsigned saturation.  This patch fixes the logic.

Signed-off-by: Joseph Myers <joseph@codesourcery.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>

diff --git a/include/math-emu/op-common.h b/include/math-emu/op-common.h
index 9696a5e..70fe5e9 100644 (file)
--- a/include/math-emu/op-common.h
+++ b/include/math-emu/op-common.h
@@ -685,7 +685,7 @@ do {                                                                        \
            else                                                                \
              {                                                                 \
                r = 0;                                                          \
-               if (X##_s)                                                      \
+               if (!X##_s)                                                     \
                  r = ~r;                                                       \
              }                                                                 \
            FP_SET_EXCEPTION(FP_EX_INVALID);                                    \
@@ -762,7 +762,7 @@ do {                                                                        \
            if (!rsigned)                                                       \
              {                                                                 \
                r = 0;                                                          \
-               if (X##_s)                                                      \
+               if (!X##_s)                                                     \
                  r = ~r;                                                       \
              }                                                                 \
            else if (rsigned != 2)                                              \