.global feclearexcept
.type feclearexcept,@function
feclearexcept:
# if (r3 & FE_INVALID) r3 |= all_invalid_flags
andis. 0,3,0x2000
stwu 1,-16(1)
beq- 0,1f
oris 3,3,0x01f8
ori 3,3,0x0700
1:
# note: fpscr contains various fpu status and control
# flags and we dont check if r3 may alter other flags
# than the exception related ones
# fpscr &= ~r3
mffs 0
stfd 0,8(1)
lwz 9,12(1)
andc 9,9,3
stw 9,12(1)
lfd 0,8(1)
mtfsf 255,0
# return 0
li 3,0
addi 1,1,16
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.global feraiseexcept
.type feraiseexcept,@function
feraiseexcept:
# if (r3 & FE_INVALID) r3 |= software_invalid_flag
andis. 0,3,0x2000
stwu 1,-16(1)
beq- 0,1f
ori 3,3,0x0400
1:
# fpscr |= r3
mffs 0
stfd 0,8(1)
lwz 9,12(1)
or 9,9,3
stw 9,12(1)
lfd 0,8(1)
mtfsf 255,0
# return 0
li 3,0
addi 1,1,16
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.global fetestexcept
.type fetestexcept,@function
fetestexcept:
# return r3 & fpscr
stwu 1,-16(1)
mffs 0
stfd 0,8(1)
lwz 9,12(1)
addi 1,1,16
and 3,3,9
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.global fegetround
.type fegetround,@function
fegetround:
# return fpscr & 3
stwu 1,-16(1)
mffs 0
stfd 0,8(1)
lwz 3,12(1)
addi 1,1,16
clrlwi 3,3,30
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.global fesetround
.type fesetround,@function
fesetround:
# note: invalid input is not checked, r3 < 4 must hold
# fpscr = (fpscr & -4U) | r3
stwu 1,-16(1)
mffs 0
stfd 0,8(1)
lwz 9,12(1)
clrrwi 9,9,2
or 9,9,3
stw 9,12(1)
lfd 0,8(1)
mtfsf 255,0
# return 0
li 3,0
addi 1,1,16
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.global fegetenv
.type fegetenv,@function
fegetenv:
# *r3 = fpscr
mffs 0
stfd 0,0(3)
# return 0
li 3,0
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.global fesetenv
.type fesetenv,@function
fesetenv:
cmpwi 3, -1
bne 1f
mflr 4
bl 2f
.zero 8
2: mflr 3
mtlr 4
1: # fpscr = *r3
lfd 0,0(3)
mtfsf 255,0
# return 0
li 3,0
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