mirror of
https://github.com/pkivolowitz/asm_book.git
synced 2026-06-21 02:26:59 +08:00
added example.S and added comments to test.s
This commit is contained in:
Perry Kivolowitz
parent
d1e57f7c50
commit
17f0773d7c
2 changed files with 184 additions and 6 deletions
178
section_2/float/example.S
Normal file
178
section_2/float/example.S
Normal file
|
|
@ -0,0 +1,178 @@
|
|||
/* Working with floating point values (in this case all doubles).
|
||||
|
||||
This program accepts a floating point command line argument to be
|
||||
used as the radius of a circle of the side of a square or length
|
||||
of a side of a right triangle. In this way, various floating point
|
||||
operations will be demonstrated.
|
||||
|
||||
Perry Kivolowitz
|
||||
Professor of Computer Science
|
||||
Carthage College
|
||||
|
||||
4/4/2024
|
||||
*/
|
||||
|
||||
#include "apple-linux-convergence.S"
|
||||
|
||||
.text
|
||||
.p2align 2
|
||||
GLABEL main
|
||||
|
||||
/* D20 will be used to buffer the value of PI to allow it to be shared
|
||||
amongst all sample functions.
|
||||
|
||||
D21 will be used to buffer the value provided on the command line.
|
||||
*/
|
||||
PI .req d20
|
||||
DVAL .req d21
|
||||
|
||||
/* GetOptions - this function will examine the command line argument
|
||||
vector to find the value the user wants to work with.
|
||||
|
||||
GetOptions(int argc, char ** argv)
|
||||
w0 x1
|
||||
|
||||
Returns: Success is returned as 0 in x0. DVAL contains the value
|
||||
provided on the command line.
|
||||
|
||||
Failure is returned as non-zero in x0. DVAL is
|
||||
undefined.
|
||||
*/
|
||||
|
||||
GetOptions:
|
||||
START_PROC
|
||||
PUSH_P x29, x30
|
||||
mov x29, sp
|
||||
// argc must have value of two
|
||||
cmp x0, 2
|
||||
beq 10f
|
||||
mov x0, 1
|
||||
b 99f
|
||||
|
||||
10: // When we get here, argc == 2.
|
||||
//
|
||||
// Preincrement argv to skip passed argv[0]. argc being 2
|
||||
// promises that x1 is not null. *argv[1] is put in x0 and
|
||||
// atof is called.
|
||||
|
||||
ldr x0, [x1, 8]!
|
||||
CRT atof
|
||||
fmov DVAL, d0
|
||||
mov x0, xzr
|
||||
|
||||
99: POP_P x29, x30
|
||||
ret
|
||||
END_PROC
|
||||
|
||||
/* void AreaOfCircle(void) - this function computes and prints the area
|
||||
of a circle whose radius is contained in DVAL (a double register).
|
||||
*/
|
||||
AreaOfCircle:
|
||||
START_PROC
|
||||
PUSH_P x29, x30
|
||||
fmul d1, DVAL, DVAL // r^2
|
||||
fmul d1, d1, PI // PI * R * R
|
||||
// Print result
|
||||
LLD_ADDR x0, CArea
|
||||
fmov d0, DVAL
|
||||
|
||||
#if defined(__APPLE__)
|
||||
PUSH_P d0, d1
|
||||
CRT printf
|
||||
add sp, sp, 16
|
||||
#else
|
||||
bl printf
|
||||
#endif
|
||||
|
||||
POP_P x29, x30
|
||||
ret
|
||||
END_PROC
|
||||
|
||||
/* void AreaOfSquare(void) - this function computes and prints the area
|
||||
of a square whose side is contained in DVAL (a double register).
|
||||
*/
|
||||
|
||||
AreaOfSquare:
|
||||
START_PROC
|
||||
PUSH_P x29, x30
|
||||
fmul d1, DVAL, DVAL // side^2
|
||||
// Print result
|
||||
LLD_ADDR x0, SArea
|
||||
fmov d0, DVAL
|
||||
|
||||
#if defined(__APPLE__)
|
||||
PUSH_P d0, d1
|
||||
CRT printf
|
||||
add sp, sp, 16
|
||||
#else
|
||||
bl printf
|
||||
#endif
|
||||
|
||||
POP_P x29, x30
|
||||
ret
|
||||
END_PROC
|
||||
|
||||
/* void AreaOfRTrianle(void) - this function computes and prints the
|
||||
area of a right triangle whose side is contained in DVAL (a double
|
||||
register).
|
||||
*/
|
||||
|
||||
AreaOfRTrianle:
|
||||
START_PROC
|
||||
PUSH_P x29, x30
|
||||
fmov d2, 2.0
|
||||
fdiv d1, DVAL, d2 // half the base
|
||||
fmul d1, d1, DVAL // times the height
|
||||
// Print result
|
||||
LLD_ADDR x0, TArea
|
||||
fmov d0, DVAL
|
||||
|
||||
#if defined(__APPLE__)
|
||||
PUSH_P d0, d1
|
||||
CRT printf
|
||||
add sp, sp, 16
|
||||
#else
|
||||
bl printf
|
||||
#endif
|
||||
|
||||
POP_P x29, x30
|
||||
ret
|
||||
END_PROC
|
||||
|
||||
MAIN
|
||||
START_PROC
|
||||
PUSH_P x29, x30
|
||||
PUSH_P d20, d21
|
||||
mov x29, sp
|
||||
|
||||
// Get the command line parameter. If successful, x0 will be
|
||||
// 0 and double register DVAL will contain the value.
|
||||
|
||||
bl GetOptions
|
||||
cbnz x0, 99f
|
||||
|
||||
// Load address of the pi literal. Load it into d20
|
||||
// for use in various functions.
|
||||
|
||||
LLD_ADDR x0, pi
|
||||
ldr PI, [x0]
|
||||
|
||||
bl AreaOfCircle
|
||||
bl AreaOfSquare
|
||||
bl AreaOfRTrianle
|
||||
|
||||
99: POP_P d20, d21
|
||||
POP_P x29, x30
|
||||
mov w0, wzr
|
||||
ret
|
||||
END_PROC
|
||||
|
||||
.data
|
||||
.p2align 3
|
||||
|
||||
pi: .double 3.14159265358979323846
|
||||
CArea: .asciz "Area of circle with radius: %f is: %f\n"
|
||||
SArea: .asciz "Area of square with side: %f is: %f\n"
|
||||
TArea: .asciz "Area of right triangle with side: %f is: %f\n"
|
||||
|
||||
.end
|
||||
|
|
@ -2,12 +2,12 @@
|
|||
.p2align 2
|
||||
.global test
|
||||
|
||||
test: fmov d0, 1.0
|
||||
fmov d0, 1.5
|
||||
fmov d0, 1.75
|
||||
fmov d0, 1.875
|
||||
fmov d0, 1.9375
|
||||
fmov d0, 1.96875
|
||||
test: fmov d0, 1.0 //
|
||||
fmov d0, 1.5 // 1/2
|
||||
fmov d0, 1.75 // 1/2 + 1/4
|
||||
fmov d0, 1.875 // 1/2 + 1/4 + 1/8
|
||||
fmov d0, 1.9375 // 1/2 + 1/4 + 1/8 + 1/16
|
||||
fmov d0, 1.96875 // 1/2 + 1/4 + 1/8 + 1/16 + 1/32
|
||||
ret
|
||||
|
||||
.end
|
||||
|
|
|
|||
Loading…
Reference in a new issue