diff --git a/test/Transforms/LICM/sink_multiple.ll b/test/Transforms/LICM/sink_multiple.ll new file mode 100644 index 00000000000..888dfbe3a52 --- /dev/null +++ b/test/Transforms/LICM/sink_multiple.ll @@ -0,0 +1,19 @@ +; The loop sinker was running from the bottom of the loop to the top, causing +; it to miss opportunities to sink instructions that depended on sinking other +; instructions from the loop. Instead they got hoisted, which is better than +; leaving them in the loop, but increases register pressure pointlessly. + +; RUN: llvm-as < %s | opt -licm | llvm-dis | grep -C1 getelementptr | grep Out: + +%Ty = type { int, int } +%X = external global %Ty + +int %test() { + br label %Loop +Loop: + %dead = getelementptr %Ty* %X, long 0, ubyte 0 + %sunk2 = load int* %dead + br bool false, label %Loop, label %Out +Out: + ret int %sunk2 +}