Initial skeleton of Subzero.

tests_lit/llvm2ice_tests/call.ll

+; RUIN: %llvm2ice -verbose inst %s | FileCheck %s
+; RUIN: %llvm2ice --verbose none %s | FileCheck --check-prefix=ERRORS %s
+; RUN: %szdiff --llvm2ice=%llvm2ice %s | FileCheck --check-prefix=DUMP %s
+
+define i32 @fib(i32 %n) {
+; CHECK: define i32 @fib
+entry:
+  %cmp = icmp slt i32 %n, 2
+  br i1 %cmp, label %return, label %if.end
+
+if.end:                                           ; preds = %entry
+  %sub = add i32 %n, -1
+  %call = tail call i32 @fib(i32 %sub)
+  %sub1 = add i32 %n, -2
+  %call2 = tail call i32 @fib(i32 %sub1)
+  %add = add i32 %call2, %call
+  ret i32 %add
+
+return:                                           ; preds = %entry
+  ret i32 %n
+}
+
+define i32 @fact(i32 %n) {
+; CHECK: define i32 @fact
+entry:
+  %cmp = icmp slt i32 %n, 2
+  br i1 %cmp, label %return, label %if.end
+
+if.end:                                           ; preds = %entry
+  %sub = add i32 %n, -1
+  %call = tail call i32 @fact(i32 %sub)
+  %mul = mul i32 %call, %n
+  ret i32 %mul
+
+return:                                           ; preds = %entry
+  ret i32 %n
+}
+
+define i32 @redirect(i32 %n) {
+; CHECK: define i32 @redirect
+entry:
+  %call = tail call i32 @redirect_target(i32 %n)
+  ret i32 %call
+}
+
+declare i32 @redirect_target(i32)
+
+define void @call_void(i32 %n) {
+; CHECK: define void @call_void
+entry:
+  %cmp2 = icmp sgt i32 %n, 0
+  br i1 %cmp2, label %if.then, label %if.end
+
+if.then:                                          ; preds = %entry, %if.then
+  %n.tr3 = phi i32 [ %call.i, %if.then ], [ %n, %entry ]
+  %sub = add i32 %n.tr3, -1
+  %call.i = tail call i32 @redirect_target(i32 %sub)
+  %cmp = icmp sgt i32 %call.i, 0
+  br i1 %cmp, label %if.then, label %if.end
+
+if.end:                                           ; preds = %if.then, %entry
+  ret void
+}
+
+; ERRORS-NOT: ICE translation error
+; DUMP-NOT: SZ