On 11/08/2015 06:43 AM, Chen Gang wrote:
+#if !defined(HOST_WORDS_BIGENDIAN) + /* According to float(uns)sisf2 and float(uns)sidf2 in gcc tilegx.md */ + uint64_t exp : 8; /* exp, 0x9e: 31 + TILEGX_F_EXP_FZERO */ + uint64_t uiknown0 : 2; /* unknown */
I would really rather you didn't use bitfields, because of exactly this sort of endianness problem. Because, really, you can't trust this layout. But I won't press this point, because it is complicated enough already.
+#endif +} TileGXFPSFmt; +/*
Watch your spacing.
+ * Double exp analyzing: (0x21b00 << 1) - 0x36(54) = 0x400 + * + * 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 + * + * 1 0 0 0 0 1 1 0 1 1 0 0 0 0 0 0 0 0 + * + * 0 0 0 0 0 1 1 0 1 1 1 => 0x37(55) + * + * 0 1 1 1 1 1 1 1 1 1 1 => 0x3ff
What is this table supposed to mean?
+#if 0 + uint64_t exp : 11; /* exp, 0x21b << 1: 55 + TILEGX_F_EXP_DZERO */ + uint64_t ov : 1; /* overflow for mul, low priority */ + uint64_t uv : 1; /* underflow for mul, high priority */ +#endif
No if 0.
+#pragma pack(pop)
Huh? What are you attempting to do here? r~
