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https://github.com/jart/cosmopolitan.git
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b8a6a989c0
This change greatly reduces the number of modules that need to be compiled. The only issue right now is that sometimes when viewing symbol table entries, the aliased symbol is chosen.
57 lines
2.5 KiB
C
57 lines
2.5 KiB
C
#ifndef COSMOPOLITAN_LIBC_BITS_PUSHPOP_H_
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#define COSMOPOLITAN_LIBC_BITS_PUSHPOP_H_
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#include "libc/macros.internal.h"
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#if !(__ASSEMBLER__ + __LINKER__ + 0)
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#ifdef COSMO
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#if !defined(__GNUC__) || defined(__STRICT_ANSI__) || !defined(__x86_64__)
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#define pushpop(x) (x)
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#else
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/**
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* PushPop
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* An elegant weapon for a more civilized age.
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*/
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#define pushpop(x) \
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({ \
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typeof(x) Popped; \
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if (__builtin_constant_p(x) && \
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(TYPE_SIGNED(typeof(x)) ? (intptr_t)(x) + 128 < 256 \
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: (intptr_t)(x) < 128)) { \
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if (x) { \
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asm("push\t%1\n\t" \
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"pop\t%q0" \
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: "=r"(Popped) \
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: "ir"(x)); \
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} else { \
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asm("xor\t%k0,%k0" : "=r"(Popped)); \
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} \
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} else { \
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asm("" : "=r"(Popped) : "0"(x)); \
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} \
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Popped; \
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})
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#endif
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#if !defined(__GNUC__) || defined(__STRICT_ANSI__) || !defined(__x86_64__)
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#define pushmov(d, x) (*(d) = (x))
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#else
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#define pushmov(d, x) \
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({ \
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typeof(*(d)) Popped = (x); \
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if (__builtin_constant_p(x) && \
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(TYPE_SIGNED(typeof(x)) ? (intptr_t)(x) + 128 < 256 \
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: (intptr_t)(x) < 128)) { \
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asm("pushq\t%1\n\t" \
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"popq\t%0" \
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: "=m"(*(d)) \
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: "ir"(Popped)); \
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} else { \
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*(d) = Popped; \
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} \
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Popped; \
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})
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#endif
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#endif /* COSMO */
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#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
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#endif /* COSMOPOLITAN_LIBC_BITS_PUSHPOP_H_ */
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