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