48 lines
1.0 KiB
C
48 lines
1.0 KiB
C
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#ifndef COSMOPOLITAN_TOOL_BUILD_LIB_FPU_H_
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#define COSMOPOLITAN_TOOL_BUILD_LIB_FPU_H_
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#include "tool/build/lib/machine.h"
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#define kFpuTagValid 0b00
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#define kFpuTagZero 0b01
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#define kFpuTagSpecial 0b10
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#define kFpuTagEmpty 0b11
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#if !(__ASSEMBLER__ + __LINKER__ + 0)
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COSMOPOLITAN_C_START_
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void OpFpu(struct Machine *);
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void OpFinit(struct Machine *);
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void OpFwait(struct Machine *);
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void FpuPush(struct Machine *, long double);
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long double FpuPop(struct Machine *);
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forceinline long double *FpuSt(struct Machine *m, unsigned i) {
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i += m->fpu.sp;
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i &= 0b111;
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return m->fpu.st + i;
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}
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forceinline int FpuGetTag(struct Machine *m, unsigned i) {
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unsigned t;
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t = m->fpu.tw;
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i += m->fpu.sp;
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i &= 0b111;
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i *= 2;
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t &= 0b11 << i;
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t >>= i;
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return t;
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}
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forceinline void FpuSetTag(struct Machine *m, unsigned i, unsigned t) {
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i += m->fpu.sp;
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t &= 0b11;
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i &= 0b111;
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i *= 2;
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m->fpu.tw &= ~(0b11 << i);
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m->fpu.tw |= t << i;
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}
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COSMOPOLITAN_C_END_
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#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
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#endif /* COSMOPOLITAN_TOOL_BUILD_LIB_FPU_H_ */
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