py/objfloat: Fix case of raising 0 to -infinity.

dpgeorge · dpgeorge · commit bbb08431f3c4 · 2018-02-08T14:35:43.000+11:00
It was raising an exception but it should return infinity.
diff --git a/py/objfloat.c b/py/objfloat.c
@@ -293,7 +293,7 @@ mp_obj_t mp_obj_float_binary_op(mp_binary_op_t op, mp_float_t lhs_val, mp_obj_t
             break;
         case MP_BINARY_OP_POWER:
         case MP_BINARY_OP_INPLACE_POWER:
-            if (lhs_val == 0 && rhs_val < 0) {
+            if (lhs_val == 0 && rhs_val < 0 && !isinf(rhs_val)) {
                 goto zero_division_error;
             }
             if (lhs_val < 0 && rhs_val != MICROPY_FLOAT_C_FUN(floor)(rhs_val)) {
diff --git a/tests/float/builtin_float_pow.py b/tests/float/builtin_float_pow.py
@@ -0,0 +1,11 @@
+# test builtin pow function with float args
+
+print(pow(0.0, 0.0))
+print(pow(0, 1.0))
+print(pow(1.0, 1))
+print(pow(2.0, 3.0))
+print(pow(2.0, -4.0))
+
+print(pow(0.0, float('inf')))
+print(pow(0.0, float('-inf')))
+print(pow(0.0, float('nan')))

Original file line number	Diff line number	Diff line change
`@@ -293,7 +293,7 @@ mp_obj_t mp_obj_float_binary_op(mp_binary_op_t op, mp_float_t lhs_val, mp_obj_t`
`293`	`293`	`break;`
`294`	`294`	`case MP_BINARY_OP_POWER:`
`295`	`295`	`case MP_BINARY_OP_INPLACE_POWER:`
`296`		`- if (lhs_val == 0 && rhs_val < 0) {`
	`296`	`+ if (lhs_val == 0 && rhs_val < 0 && !isinf(rhs_val)) {`
`297`	`297`	`goto zero_division_error;`
`298`	`298`	`}`
`299`	`299`	`if (lhs_val < 0 && rhs_val != MICROPY_FLOAT_C_FUN(floor)(rhs_val)) {`