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Add overflow and underflow checking for floats

This commit is contained in:
drmortalwombat 2021-11-24 20:01:08 +01:00
parent 84648fbd88
commit 93174c8e68
6 changed files with 283 additions and 104 deletions
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3
README.md
View File

@ -38,8 +38,7 @@ There are still several open areas, but most targets have been reached. The cur
### Runtime
* No INF and NaN support for floats
* Underflow in float multiply and divide not checked
* No NaN support for floats
* Basic zero page variables not restored on stop/restore
### Optimizing

107
include/crt.c
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@ -2474,6 +2474,22 @@ W1:
__asm faddsub
{
lda #$ff
cmp tmp + 4
beq INF
cmp tmp + 5
bne nINF
INF:
lda accu + 3
ora #$7f
sta accu + 3
lda #$80
sta accu + 2
lda #$00
sta accu + 0
sta accu + 1
rts
nINF:
sec
lda tmp + 4
sbc tmp + 5
@ -2542,6 +2558,8 @@ fas_aligned:
inc tmp + 4
fas_done:
lda tmp + 4
cmp #$ff
beq INF
lsr
ora accu + 3
sta accu + 3
@ -2677,6 +2695,17 @@ W1:
sta accu + 3
rts
W2:
lda accu + 3
eor tmp + 3
and #$80
sta accu + 3
lda #$ff
cmp tmp + 4
beq INF
cmp tmp + 5
beq INF
lda #0
sta tmp + 6
sta tmp + 7
@ -2707,16 +2736,28 @@ W5:
W3: and #$7f
sta tmp + 8
lda accu + 3
eor tmp + 3
and #$80
sta accu + 3
lda tmp + 4
sbc #$7e
clc
adc tmp + 5
bcc W7
sbc #$7f
bcs INF
cmp #$ff
bne W8
INF:
lda accu + 3
ora #$7f
sta accu + 3
lda #$80
sta accu + 2
lda #$00
sta accu + 0
sta accu + 1
rts
W7:
sbc #$7e
bcc ZERO
W8:
lsr
ora accu + 3
sta accu + 3
@ -2729,6 +2770,13 @@ W3: and #$7f
lda tmp + 6
sta accu
rts
ZERO:
lda #0
sta accu
sta accu + 1
sta accu + 2
sta accu + 3
rts
}
__asm inp_binop_mul_f32
@ -2754,6 +2802,12 @@ W1:
and #$80
sta accu + 3
lda tmp + 5
beq INF
lda tmp + 4
cmp #$ff
beq INF
lda #0
sta tmp + 6
sta tmp + 7
@ -2804,12 +2858,29 @@ W4:
and #$7f
sta tmp + 8
lda tmp + 5
eor #$7f
adc tmp + 4
sec
sbc #1
lda tmp + 4
sbc tmp + 5
bcc W5
clc
adc #$7f
bcs INF
cmp #$ff
bne W6
INF:
lda accu + 3
ora #$7f
sta accu + 3
lda #$80
sta accu + 2
lda #$00
sta accu + 1
sta accu + 0
rts
W5:
adc #$7f
bcc ZERO
W6:
lsr
ora accu + 3
sta accu + 3
@ -2822,6 +2893,16 @@ W4:
lda tmp + 6
sta accu
rts
ZERO:
lda #$00
sta accu + 3
sta accu + 2
sta accu + 1
sta accu + 0
rts
}
#pragma bytecode(BC_BINOP_MUL_F32, inp_binop_mul_f32)

34
include/math.c
View File

@ -199,3 +199,37 @@ float sqrt(float f)
}
bool isinf(float f)
{
__asm
{
lda #$00
sta accu + 1
asl f + 2
lda f + 3
rol
eor #$ff
beq W1
lda #$01
W1:
eor #$01
sta accu
}
}
bool isfinite(float f)
{
__asm
{
lda #$00
sta accu + 1
asl f + 2
lda f + 3
rol
eor #$ff
beq W1
lda #$01
W1:
sta accu
}
}

3
include/math.h
View File

@ -23,6 +23,9 @@ float log10(float f);
float pow(float p, float q);
float sqrt(float f);
bool isinf(float f);
bool isfinite(float f);
#pragma intrinsic(fabs)
#pragma intrinsic(floor)
#pragma intrinsic(ceil)

9
include/stdio.c
View File

@ -259,6 +259,14 @@ int nformf(const sinfo * si, char * str, float f, char type)
else if (si->sign)
sp[d++] = '+';
if (isinf(f))
{
sp[d++] = 'I';
sp[d++] = 'N';
sp[d++] = 'F';
}
else
{
int exp = 0;
char fdigits = si->precision != 255 ? si->precision : 6;
@ -359,6 +367,7 @@ int nformf(const sinfo * si, char * str, float f, char type)
sp[d++] = exp / 10 + '0';
sp[d++] = exp % 10 + '0';
}
}
if (d < si->width)
{

53
oscar64/Parser.cpp
View File

@ -707,6 +707,59 @@ Expression* Parser::ParseInitExpression(Declaration* dtype)
nexp->mDecValue = ndec;
exp = nexp;
}
else if (exp->mType == EX_CONSTANT && exp->mDecType != dtype)
{
Expression* nexp = new Expression(mScanner->mLocation, EX_CONSTANT);
nexp->mDecType = dtype;
if (dtype->mType == DT_TYPE_INTEGER || dtype->mType == DT_TYPE_ENUM || dtype->mType == DT_TYPE_BOOL)
{
Declaration* ndec = new Declaration(exp->mDecValue->mLocation, DT_CONST_INTEGER);
ndec->mBase = dtype;
ndec->mSize = dtype->mSize;
if (exp->mDecValue->mType == DT_CONST_INTEGER)
ndec->mInteger = exp->mDecValue->mInteger;
else if (exp->mDecValue->mType == DT_CONST_FLOAT)
ndec->mInteger = int64(exp->mDecValue->mNumber);
else
mErrors->Error(mScanner->mLocation, EERR_CONSTANT_INITIALIZER, "Illegal integer constant initializer");
nexp->mDecValue = ndec;
}
else if (dtype->mType == DT_TYPE_FLOAT)
{
Declaration* ndec = new Declaration(exp->mDecValue->mLocation, DT_CONST_FLOAT);
ndec->mBase = dtype;
ndec->mSize = dtype->mSize;
if (exp->mDecValue->mType == DT_CONST_INTEGER)
ndec->mNumber = double(exp->mDecValue->mInteger);
else if (exp->mDecValue->mType == DT_CONST_FLOAT)
ndec->mNumber = exp->mDecValue->mNumber;
else
mErrors->Error(mScanner->mLocation, EERR_CONSTANT_INITIALIZER, "Illegal float constant initializer");
nexp->mDecValue = ndec;
}
else if (dtype->mType == DT_TYPE_POINTER)
{
if (exp->mDecValue->mType == DT_CONST_ADDRESS)
;
else
mErrors->Error(mScanner->mLocation, EERR_CONSTANT_INITIALIZER, "Illegal pointer constant initializer");
nexp = exp;
}
else
{
mErrors->Error(mScanner->mLocation, EERR_CONSTANT_INITIALIZER, "Illegal constant initializer");
nexp = exp;
}
exp = nexp;
}
}
return exp;