58 lines
941 B
NASM
58 lines
941 B
NASM
global _start
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section .data
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align 16
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controlword:
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dw 0
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dwordmxcsr:
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dw 0
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dword0:
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dd 1000.0
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dword1:
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dd 5.0
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dword2:
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dd 3000.0
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dwSNaN:
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dd __SNaN__
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dwQNaN:
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dd __QNaN__
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; Moves EFLAGS into specified register
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%macro moveflags 1
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pushf
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and dword [esp], 0x45
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pop eax
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movd %1, eax
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%endmacro
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%include "header.inc"
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movd xmm0, [dword0]
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; Equal
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comiss xmm0, [dword0]
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moveflags mm0 ; [ZF] = 100000
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; Less than
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comiss xmm0, [dword1]
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moveflags mm1 ; [CF] = 000001
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; Greater than
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comiss xmm0, [dword2]
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moveflags mm2 ; [] = 000000
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; Unordered: Quiet NaN
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movd xmm1, [dwQNaN]
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ucomiss xmm0, xmm1
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moveflags mm3 ; [ZF][PF][CF] = 100101
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; Check #I exception
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stmxcsr [dwordmxcsr]
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movd mm4, [dwordmxcsr]
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; Unordered: Signaling NaN
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movd xmm1,[dwSNaN]
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ucomiss xmm0, xmm1
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moveflags mm5 ; [ZF][PF][CF] = 100101
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; Check #I exception
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stmxcsr [dwordmxcsr]
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movd mm6, [dwordmxcsr]
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%include "footer.inc"
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