79 lines
2.6 KiB
C
79 lines
2.6 KiB
C
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#ifndef COSMOPOLITAN_TOOL_BUILD_LIB_FLAGS_H_
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#define COSMOPOLITAN_TOOL_BUILD_LIB_FLAGS_H_
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#define FLAGS_CF 0
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#define FLAGS_VF 1
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#define FLAGS_PF 2
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#define FLAGS_F1 3
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#define FLAGS_AF 4
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#define FLAGS_KF 5
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#define FLAGS_ZF 6
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#define FLAGS_SF 7
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#define FLAGS_TF 8
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#define FLAGS_IF 9
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#define FLAGS_DF 10
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#define FLAGS_OF 11
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#define FLAGS_IOPL 12
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#define FLAGS_NT 14
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#define FLAGS_F0 15
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#define FLAGS_RF 16
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#define FLAGS_VM 17
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#define FLAGS_AC 18
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#define FLAGS_VIF 19
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#define FLAGS_VIP 20
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#define FLAGS_ID 21
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#define GetLazyParityBool(f) GetParity((f) >> 24)
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#define SetLazyParityByte(f, x) (((f) & ~0xFF000000u) | ((x)&0xFF) << 24)
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#define GetParity(WORD) \
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({ \
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unsigned Byte = (WORD); \
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Byte ^= Byte >> 4; \
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Byte ^= Byte >> 2; \
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Byte ^= Byte >> 1; \
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~Byte & 1; \
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})
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#define GetFlag(FLAGS, BIT) \
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({ \
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autotype(FLAGS) Flags = (FLAGS); \
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typeof(Flags) IsSet; \
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switch (BIT) { \
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case FLAGS_PF: \
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IsSet = GetLazyParityBool(Flags); \
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break; \
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default: \
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IsSet = (Flags >> (BIT)) & 1; \
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break; \
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} \
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IsSet; \
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})
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#define SetFlag(FLAGS, BIT, VAL) \
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({ \
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autotype(FLAGS) Flags = (FLAGS); \
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typeof(Flags) Val = (VAL); \
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typeof(Flags) One = 1; \
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switch (BIT) { \
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case FLAGS_PF: \
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Flags = SetLazyParityByte(Flags, !Val); \
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break; \
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default: \
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Flags = (Flags & ~(One << (BIT))) | Val << (BIT); \
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break; \
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} \
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Flags; \
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})
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forceinline uint64_t ExportFlags(uint64_t flags) {
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flags = SetFlag(flags, FLAGS_IOPL, 3);
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flags = SetFlag(flags, FLAGS_F1, true);
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flags = SetFlag(flags, FLAGS_F0, false);
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flags = flags & ~(1ull << FLAGS_PF);
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flags |= GetLazyParityBool(flags) << FLAGS_PF;
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return flags;
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}
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#endif /* COSMOPOLITAN_TOOL_BUILD_LIB_FLAGS_H_ */
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