d0p1/ack
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

Use nicely optimised helper tools to do signed comparisons of words. Star Trek

Browse source 
goes from 40452 to 39890 bytes.
This commit is contained in:
David Given 2019-02-14 23:57:55 +01:00
parent 0694cf34b0
commit 2924ce8ffa
3 changed files with 43 additions and 68 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

18
mach/i80/libem/cmps_mag.s Normal file
View file

@ -0,0 +1,18 @@
.sect .text
.sect .rom
.sect .data
.sect .bss
.sect .text
! Does a tristate signed comparison of hl <> de.
! Returns m flag if hl < de.
! Returns p flag if hl >= de.
! This doesn't set z coherently.
.define .cmps_mag
.cmps_mag:
mov a, d
xra h
jp .cmpu_mag ! signs are the same, so an unsigned comparison will do
xra h ! set A=H and set the sign flag
ret

19
mach/i80/libem/cmpu_mag.s Normal file
View file

@ -0,0 +1,19 @@
.sect .text
.sect .rom
.sect .data
.sect .bss
.sect .text
! Does a tristate unsigned comparison of hl <> de.
! Returns m flag if hl < de.
! Returns p flag if hl >= de.
! This doesn't set z coherently.
.define .cmpu_mag
.cmpu_mag:
mov a, e
sub l
mov a, d
sbb h
rar
ret

74
mach/i80/ncg/table
View file

@ -1875,42 +1875,11 @@ pat bra
jmp {label,$1}
pat blt
with const2 hl_or_de STACK
with hlreg dereg STACK
uses areg
gen
mov a, %2.1
xri {const1, 0x80}
mov %2.1, a
mov a, %2.2
sui {const1, %1.num & 0xff}
mov a, %2.1
sbi {const1, (%1.num >> 8) ^ 0x80}
jc {label, $1}
with hl_or_de const2 STACK
uses areg
gen
mov a, %1.1
xri {const1, 0x80}
mov %1.1, a
mvi a, {const1, %2.num & 0xff}
sub %1.2
mvi a, {const1, (%2.num >> 8) ^ 0x80}
sbb %1.1
jc {label, $1}
with hl_or_de hl_or_de STACK
uses areg
gen
mov a, %2.1
xri {const1, 0x80}
mov %2.1, a
mov a, %1.1
xri {const1, 0x80}
mov %1.1, a
mov a, %2.2
sub %1.2
mov a, %2.1
sbb %1.1
jc {label,$1}
Call {label, ".cmps_mag"}
jm {label, $1}
pat bgt
leaving
@ -1918,42 +1887,11 @@ pat bgt
blt $1
pat bge
with const2 hl_or_de STACK
with hlreg dereg STACK
uses areg
gen
mov a, %2.1
xri {const1, 0x80}
mov %2.1, a
mov a, %2.2
sui {const1, %1.num & 0xff}
mov a, %2.1
sbi {const1, (%1.num >> 8) ^ 0x80}
jnc {label, $1}
with hl_or_de const2 STACK
uses areg
gen
mov a, %1.1
xri {const1, 0x80}
mov %1.1, a
mvi a, {const1, %2.num & 0xff}
sub %1.2
mvi a, {const1, (%2.num >> 8) ^ 0x80}
sbb %1.1
jnc {label, $1}
with hl_or_de hl_or_de STACK
uses areg
gen
mov a, %2.1
xri {const1, 0x80}
mov %2.1, a
mov a, %1.1
xri {const1, 0x80}
mov %1.1, a
mov a,%2.2
sub %1.2
mov a,%2.1
sbb %1.1
jnc {label,$1}
Call {label, ".cmpu_mag"}
jp {label, $1}
pat ble
leaving