Re-apply r234898 and fix tests.

[oota-llvm.git] / test / Analysis / BranchProbabilityInfo / basic.ll

diff --git a/test/Analysis/BranchProbabilityInfo/basic.ll b/test/Analysis/BranchProbabilityInfo/basic.ll
index 0f669119bfeabb22680801aa7cb0e2a3e5f44d65..2c9c1561868284d96efd2a8e5af30986d05e0b2c 100644 (file)
--- a/test/Analysis/BranchProbabilityInfo/basic.ll
+++ b/test/Analysis/BranchProbabilityInfo/basic.ll
@@ -212,3 +212,31 @@ exit:
   ret i32 %result
 }
 
+define i32 @zero3(i32 %i, i32 %a, i32 %b) {
+; CHECK: Printing analysis {{.*}} for function 'zero3'
+entry:
+; AND'ing with a single bit bitmask essentially leads to a bool comparison,
+; meaning we don't have probability information.
+  %and = and i32 %i, 2
+  %tobool = icmp eq i32 %and, 0
+  br i1 %tobool, label %then, label %else
+; CHECK: edge entry -> then probability is 16 / 32
+; CHECK: edge entry -> else probability is 16 / 32
+
+then:
+; AND'ing with other bitmask might be something else, so we still assume the
+; usual probabilities.
+  %and2 = and i32 %i, 5
+  %tobool2 = icmp eq i32 %and2, 0
+  br i1 %tobool2, label %else, label %exit
+; CHECK: edge then -> else probability is 12 / 32
+; CHECK: edge then -> exit probability is 20 / 32
+
+else:
+  br label %exit
+
+exit:
+  %result = phi i32 [ %a, %then ], [ %b, %else ]
+  ret i32 %result
+}
+