Initial skeleton of Subzero.

tests_lit/llvm2ice_tests/cmp-opt.ll

+; RUIN: %llvm2ice %s | FileCheck %s
+; RUIN: %llvm2ice --verbose none %s | FileCheck --check-prefix=ERRORS %s
+; RUN: %szdiff --llvm2ice=%llvm2ice %s | FileCheck --check-prefix=DUMP %s
+
+define void @testBool(i32 %a, i32 %b) {
+entry:
+  %cmp = icmp slt i32 %a, %b
+  %cmp1 = icmp sgt i32 %a, %b
+  br i1 %cmp, label %if.then, label %if.end
+
+if.then:                                          ; preds = %entry
+  tail call void @use(i1 %cmp)
+  br label %if.end
+
+if.end:                                           ; preds = %if.then, %entry
+  br i1 %cmp1, label %if.then5, label %if.end7
+
+if.then5:                                         ; preds = %if.end
+  tail call void @use(i1 %cmp1)
+  br label %if.end7
+
+if.end7:                                          ; preds = %if.then5, %if.end
+  ret void
+}
+
+declare void @use(i1 zeroext)
+
+; ERRORS-NOT: ICE translation error
+
+; CHECK:      .globl testBool
+; Two bool computations
+; CHECK:      cmp
+; CHECK:      cmp
+; Test first bool
+; CHECK:      cmp
+; CHECK:      call
+; Test second bool
+; CHECK:      cmp
+; CHECK:      call
+; CHECK:      ret
+; DUMP-NOT: SZ