1 files changed, 75 insertions, 0 deletions
diff --git a/test/CodeGen/X86/block-placement.ll b/test/CodeGen/X86/block-placement.ll
new file mode 100644
index 0000000000..c7ab6ef821
--- /dev/null
+++ b/test/CodeGen/X86/block-placement.ll
@@ -0,0 +1,75 @@
+; RUN: llc -march=x86 -enable-block-placement < %s | FileCheck %s
+
+declare void @error(i32 %i, i32 %a, i32 %b)
+
+define i32 @test1(i32 %i, i32* %a, i32 %b) {
+; Test a chain of ifs, where the block guarded by the if is error handling code
+; that is not expected to run.
+; CHECK: test1:
+; CHECK: %entry
+; CHECK: %else1
+; CHECK: %else2
+; CHECK: %else3
+; CHECK: %else4
+; CHECK: %exit
+; CHECK: %then1
+; CHECK: %then2
+; CHECK: %then3
+; CHECK: %then4
+; CHECK: %then5
+
+entry:
+  %gep1 = getelementptr i32* %a, i32 1
+  %val1 = load i32* %gep1
+  %cond1 = icmp ugt i32 %val1, 1
+  br i1 %cond1, label %then1, label %else1, !prof !0
+
+then1:
+  call void @error(i32 %i, i32 1, i32 %b)
+  br label %else1
+
+else1:
+  %gep2 = getelementptr i32* %a, i32 2
+  %val2 = load i32* %gep2
+  %cond2 = icmp ugt i32 %val2, 2
+  br i1 %cond2, label %then2, label %else2, !prof !0
+
+then2:
+  call void @error(i32 %i, i32 1, i32 %b)
+  br label %else2
+
+else2:
+  %gep3 = getelementptr i32* %a, i32 3
+  %val3 = load i32* %gep3
+  %cond3 = icmp ugt i32 %val3, 3
+  br i1 %cond3, label %then3, label %else3, !prof !0
+
+then3:
+  call void @error(i32 %i, i32 1, i32 %b)
+  br label %else3
+
+else3:
+  %gep4 = getelementptr i32* %a, i32 4
+  %val4 = load i32* %gep4
+  %cond4 = icmp ugt i32 %val4, 4
+  br i1 %cond4, label %then4, label %else4, !prof !0
+
+then4:
+  call void @error(i32 %i, i32 1, i32 %b)
+  br label %else4
+
+else4:
+  %gep5 = getelementptr i32* %a, i32 3
+  %val5 = load i32* %gep5
+  %cond5 = icmp ugt i32 %val5, 3
+  br i1 %cond5, label %then5, label %exit, !prof !0
+
+then5:
+  call void @error(i32 %i, i32 1, i32 %b)
+  br label %exit
+
+exit:
+  ret i32 %b
+}
+
+!0 = metadata !{metadata !"branch_weights", i32 4, i32 64}