| 1 | /* |
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| 2 | * Public domain. |
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| 3 | */ |
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| 4 | |
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| 5 | #include <machine/asm.h> |
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| 6 | #include <libm-alias-double.h> |
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| 7 | |
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| 8 | RCSID("$NetBSD: s_floor.S,v 1.4 1995/05/09 00:01:59 jtc Exp $" ) |
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| 9 | |
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| 10 | ENTRY(__floor) |
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| 11 | fldl 4(%esp) |
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| 12 | subl $32,%esp |
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| 13 | cfi_adjust_cfa_offset (32) |
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| 14 | |
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| 15 | fnstenv 4(%esp) /* store fpu environment */ |
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| 16 | |
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| 17 | /* We use here %edx although only the low 1 bits are defined. |
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| 18 | But none of the operations should care and they are faster |
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| 19 | than the 16 bit operations. */ |
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| 20 | movl $0x400,%edx /* round towards -oo */ |
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| 21 | orl 4(%esp),%edx |
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| 22 | andl $0xf7ff,%edx |
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| 23 | movl %edx,(%esp) |
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| 24 | fldcw (%esp) /* load modified control word */ |
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| 25 | |
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| 26 | frndint /* round */ |
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| 27 | |
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| 28 | fldenv 4(%esp) /* restore original environment */ |
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| 29 | |
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| 30 | addl $32,%esp |
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| 31 | cfi_adjust_cfa_offset (-32) |
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| 32 | ret |
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| 33 | END (__floor) |
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| 34 | libm_alias_double (__floor, floor) |
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| 35 | |
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