nixify

2026-06-11 10:59:54 -06:00
commit 8650a71f67
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+# Programs from "Global Code Motion Global Value Numbering" by Cliff Click
+# https://courses.cs.washington.edu/courses/cse501/06wi/reading/click-pldi95.pdf
+
+# GCM program in Figure 1
+
+function w $gcm_test(w %a){
+@start
+	%i.0 =w copy 0
+@loop
+	%i.1 =w phi @start %i.0, @loop %i.2
+	%b =w add %a, 1                     # early schedule moves to @start
+	%i.2 =w add %i.1, %b
+	%c =w mul %i.2, 2                   #  late schedule moves to @end
+	%x =w csltw %i.2, 10
+	jnz %x, @loop, @end
+@end
+	ret %c
+}
+
+# GCM program in "Figure 3 x's definition does not dominate it's use"
+#
+# SSA contruction will insert phi instruction for "x" in @if_false
+# preventing the "add" in @if_false from being moved to @if_true
+
+function $gcm_test2 (w %a){
+@start
+	%f =w copy 1
+	%x =w copy 0
+	%s.0 =w copy 0
+@loop
+	%s.1 = w phi @start %s.0, @if_false %s.2
+	jnz %a, @if, @end
+@if
+	jnz %f, @if_true, @if_false
+@if_true
+	%f =w copy 0
+	%x =w add %x, 1
+@if_false
+	%s.2 =w add %s.1, %x
+	jmp @loop
+@end
+	ret
+}