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Justine Tunney 2020-06-15 07:18:57 -07:00
commit c91b3c5006
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libc/bits/pushpop.h Normal file
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#ifndef COSMOPOLITAN_LIBC_BITS_PUSHPOP_H_
#define COSMOPOLITAN_LIBC_BITS_PUSHPOP_H_
#include "libc/macros.h"
#if !(__ASSEMBLER__ + __LINKER__ + 0)
/**
* PushPop
* An elegant weapon for a more civilized age.
*/
#if !defined(__GNUC__) || defined(__STRICT_ANSI__)
#define pushpop(x) (x)
#else
#define pushpop(x) \
({ \
typeof(x) Popped; \
if (isconstant(x) && (TYPE_SIGNED(typeof(x)) ? (intptr_t)(x) + 128 < 256 \
: (intptr_t)(x) < 128)) { \
if (x) { \
asm("push\t%1\n\t" \
"pop\t%q0" \
: "=r"(Popped) \
: "ir"(x)); \
} else { \
asm("xor\t%k0,%k0" : "=r"(Popped)); \
} \
} else { \
asm("" : "=r"(Popped) : "0"(x)); \
} \
Popped; \
})
#endif
#if !defined(__GNUC__) || defined(__STRICT_ANSI__)
#define pushmov(d, x) ((d) = (x))
#else
#define pushmov(d, x) \
({ \
typeof(*(d)) Popped = (x); \
if (isconstant(x) && (TYPE_SIGNED(typeof(x)) ? (intptr_t)(x) + 128 < 256 \
: (intptr_t)(x) < 128)) { \
asm("pushq\t%1\n\t" \
"popq\t%0" \
: "=m"(*(d)) \
: "ir"(Popped)); \
} else { \
*(d) = Popped; \
} \
Popped; \
})
#endif
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
#endif /* COSMOPOLITAN_LIBC_BITS_PUSHPOP_H_ */