35 lines
783 B
ArmAsm
35 lines
783 B
ArmAsm
/* fpu_compare() - compare doubles Author: Erik van der Kouwe */
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/* fpu_sw_get() - get FPU status 17 Dec 2009 */
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/* fpu_xam() - examine double */
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#include <machine/asm.h>
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/* u16_t fpu_compare(double x, double y) */
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ENTRY(fpu_compare)
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/* move the values onto the floating point stack */
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fldl 12(%esp)
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fldl 4(%esp)
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/* compare values and return status word */
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fcompp
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jmp _C_LABEL(fpu_sw_get)
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/* u16_t fpu_sw_get(void) */
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ENTRY(fpu_sw_get)
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/* clear unused high-order word and get status word */
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xor %eax, %eax
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.byte 0xdf, 0xe0 /* fnstsw ax */
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ret
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/* u16_t fpu_xam(double value) */
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ENTRY(fpu_xam)
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/* move the value onto the floating point stack */
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fldl 4(%esp)
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/* examine value and get status word */
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fxam
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call _C_LABEL(fpu_sw_get)
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/* pop the value */
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fstp %st
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ret
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