Add a case with non-constant argument for testing the transform:

ffs(x) -> (x == 0 ? 0 : llvm.cttz(0)+1)

llvm-svn: 22069

Author: Reid Spencer

llvm/test/Regression/Transforms/SimplifyLibCalls/FFS.ll

@@ -4,12 +4,17 @@
 declare int %ffs(int)
 declare int %ffsl(int)
 declare int %ffsll(long)
+declare int %__builtin_ffs(int)
+
+%non_const = external global int
 
 implementation   ; Functions:
 
 int %main () {
+  %arg  = load int* %non_const
+  %val0 = call int %ffs(int %arg)
   %val1 = call int %ffs(int 1)
-  %val2 = call int %ffs(int 2048)
+  %val2 = call int %__builtin_ffs(int 2048)
   %val3 = call int %ffsl(int 65536)
   %val4 = call int %ffsll(long 1024)
   %val5 = call int %ffsll(long 17179869184)
@@ -19,5 +24,6 @@ int %main () {
   %rslt3 = add int %val5, %val6
   %rslt4 = add int %rslt1, %rslt2
   %rslt5 = add int %rslt4, %rslt3
+  %rslt6 = add int %rslt5, %val0
   ret int %rslt5
 }