Make sure that pure calls don't kill loads

llvm-svn: 12416
2004-03-15 04:17:53 +00:00 · 2004-03-15 04:17:53 +00:00 · ecdbee5542
parent 20cda2645e
commit ecdbee5542
1 changed files with 13 additions and 0 deletions
--- a/llvm/test/Regression/Transforms/GCSE/call_pure_function.ll
+++ b/llvm/test/Regression/Transforms/GCSE/call_pure_function.ll
@ -0,0 +1,13 @@
+; RUN: llvm-as < %s | opt -basicaa -load-vn -gcse -instcombine | llvm-dis | not grep sub
+declare int %strlen(sbyte*)
+declare void %use(int %X)
+
+sbyte %test(sbyte* %P, sbyte* %Q) {
+	%A = load sbyte* %Q
+	%X = call int %strlen(sbyte* %P)
+	%B = load sbyte* %Q                ;; CSE with A.
+	call void %use(int %X)             ;; make strlen not dead
+
+	%C = sub sbyte %A, %B
+	ret sbyte %C
+}