Changes in directory llvm/lib/Target:
README.txt updated: 1.47 -> 1.48
---
Log message:
Cute example from Chris Lattner.
---
Diffs of the changes: (+40 -0)
README.txt | 40 ++++++++++++++++++++++++++++++++++++++++
1 files changed, 40 insertions(+)
Index: llvm/lib/Target/README.txt
diff -u llvm/lib/Target/README.txt:1.47 llvm/lib/Target/README.txt:1.48
--- llvm/lib/Target/README.txt:1.47 Thu Nov 9 18:23:26 2006
+++ llvm/lib/Target/README.txt Sun Nov 12 18:23:28 2006
@@ -360,3 +360,43 @@
pass.
//===---------------------------------------------------------------------===//
+
+-predsimplify should transform this:
+
+void bad(unsigned x)
+{
+ if (x > 4)
+ bar(12);
+ else if (x > 3)
+ bar(523);
+ else if (x > 2)
+ bar(36);
+ else if (x > 1)
+ bar(65);
+ else if (x > 0)
+ bar(45);
+ else
+ bar(367);
+}
+
+into:
+
+void good(unsigned x)
+{
+ if (x == 4)
+ bar(523);
+ else if (x == 3)
+ bar(36);
+ else if (x == 2)
+ bar(65);
+ else if (x == 1)
+ bar(45);
+ else if (x == 0)
+ bar(367);
+ else
+ bar(12);
+}
+
+to enable further optimizations.
+
+//===---------------------------------------------------------------------===//
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