5b69777647
GNU as has "la %r4,8(%r3)" as an alias for "addi %r4,%r3,8", meaning to load the address of the thing at 8(%r3). Our 'la', now 'li32', makes an addis/ori pair to load an immediate 32-bit value. For example, "li32 r4,23456789" loads a big number.
38 lines
722 B
ArmAsm
38 lines
722 B
ArmAsm
#
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! $Source$
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! $State$
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! $Revision$
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#include "powerpc.h"
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.sect .text
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! Converts a 32-bit integer into a 64-bit double.
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!
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! Stack: ( int -- double )
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.define .cif8
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.cif8:
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addi sp, sp, -4 ! make space for the double
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lwz r3, 4(sp)
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xoris r3, r3, 0x8000
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stw r3, 4(sp) ! flip sign of integer value
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addis r3, r0, 0x4330
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stw r3, 0(sp) ! set high word to construct a double
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lfd f0, 0(sp) ! load value
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li32 r3, pivot
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lfd f1, 0(r3) ! load pivot value
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fsub f0, f0, f1 ! adjust
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stfd f0, 0(sp) ! save value again...
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bclr ALWAYS, 0, 0 ! ...and return
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.sect .rom
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pivot:
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.data4 0x43300000
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.data4 0x80000000
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