diff lab4/test/allregs.p @ 0:bfdcc3820b32

Basis
author Mike Spivey <mike@cs.ox.ac.uk>
date Thu, 05 Oct 2017 08:04:15 +0100
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lab4/test/allregs.p	Thu Oct 05 08:04:15 2017 +0100
@@ -0,0 +1,97 @@
+(* Expressions with high register demand *)
+
+proc foo(a, b, c, d: integer): integer;
+begin
+  return
+    (a-b)*(a-c)*(a-d)*(b-c)*(b-d)*(c-d)
+    +
+    (a-c)*(a-d)*(b-c)*(b-d)*(c-d)*(a-b)
+end;
+
+proc baz(n: integer): integer;
+begin
+  return (n-1)*(n-1)
+end;
+
+begin
+  print_num(foo(1,2,3,4)); newline();
+  print_num(baz(10)); newline()
+end.
+
+(*<<
+24
+81
+>>*)
+
+(*[[
+@ picoPascal compiler output
+	.include "fixup.s"
+	.global pmain
+
+@ proc foo(a, b, c, d: integer): integer;
+	.text
+_foo:
+	mov ip, sp
+	stmfd sp!, {r0-r3}
+	stmfd sp!, {r4-r10, fp, ip, lr}
+	mov fp, sp
+@   return
+	ldr r4, [fp, #40]
+	ldr r5, [fp, #44]
+	sub r6, r4, r5
+	ldr r7, [fp, #48]
+	sub r8, r4, r7
+	ldr r9, [fp, #52]
+	sub r4, r4, r9
+	sub r0, r5, r7
+	sub r5, r5, r9
+	sub r7, r7, r9
+	mul r1, r6, r8
+	mul r1, r1, r4
+	mul r1, r1, r0
+	mul r1, r1, r5
+	mul r1, r1, r7
+	mul r2, r8, r4
+	mul r0, r2, r0
+	mul r0, r0, r5
+	mul r0, r0, r7
+	mul r0, r0, r6
+	add r0, r1, r0
+	ldmfd fp, {r4-r10, fp, sp, pc}
+	.ltorg
+
+@ proc baz(n: integer): integer;
+_baz:
+	mov ip, sp
+	stmfd sp!, {r0-r1}
+	stmfd sp!, {r4-r10, fp, ip, lr}
+	mov fp, sp
+@   return (n-1)*(n-1)
+	ldr r0, [fp, #40]
+	sub r4, r0, #1
+	mul r0, r4, r4
+	ldmfd fp, {r4-r10, fp, sp, pc}
+	.ltorg
+
+pmain:
+	mov ip, sp
+	stmfd sp!, {r4-r10, fp, ip, lr}
+	mov fp, sp
+@   print_num(foo(1,2,3,4)); newline();
+	mov r3, #4
+	mov r2, #3
+	mov r1, #2
+	mov r0, #1
+	bl _foo
+	bl print_num
+	bl newline
+@   print_num(baz(10)); newline()
+	mov r0, #10
+	bl _baz
+	bl print_num
+	bl newline
+	ldmfd fp, {r4-r10, fp, sp, pc}
+	.ltorg
+
+@ End
+]]*)