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33 lines
1,020 B
C
33 lines
1,020 B
C
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#ifndef COSMOPOLITAN_LIBC_BITS_ASMFLAG_H_
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#define COSMOPOLITAN_LIBC_BITS_ASMFLAG_H_
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/*
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* Constraints for virtual machine flags.
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* @note we beseech clang devs for flag constraints
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*/
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#ifdef __GCC_ASM_FLAG_OUTPUTS__ /* GCC6+ CLANG10+ */
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#define CFLAG_CONSTRAINT "=@ccc"
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#define CFLAG_ASM(OP) OP
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#define ZFLAG_CONSTRAINT "=@ccz"
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#define ZFLAG_ASM(OP) OP
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#define OFLAG_CONSTRAINT "=@cco"
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#define OFLAG_ASM(OP) OP
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#define SFLAG_CONSTRAINT "=@ccs"
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#define SFLAG_ASM(SP) SP
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#define ABOVE_CONSTRAINT "=@cca" /* i.e. !ZF && !CF */
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#define ABOVEFLAG_ASM(OP) OP
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#else
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#define CFLAG_CONSTRAINT "=q"
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#define CFLAG_ASM(OP) OP "\n\tsetc\t%b0"
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#define ZFLAG_CONSTRAINT "=q"
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#define ZFLAG_ASM(OP) OP "\n\tsetz\t%b0"
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#define OFLAG_CONSTRAINT "=q"
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#define OFLAG_ASM(OP) OP "\n\tseto\t%b0"
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#define SFLAG_CONSTRAINT "=q"
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#define SFLAG_ASM(SP) OP "\n\tsets\t%b0"
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#define ABOVE_CONSTRAINT "=@cca"
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#define ABOVEFLAG_ASM(OP) OP "\n\tseta\t%b0"
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#endif
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#endif /* COSMOPOLITAN_LIBC_BITS_ASMFLAG_H_ */
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