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Diffstat (limited to 'test/Transforms/InstCombine/bitcount.ll')
| -rw-r--r-- | test/Transforms/InstCombine/bitcount.ll | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/test/Transforms/InstCombine/bitcount.ll b/test/Transforms/InstCombine/bitcount.ll new file mode 100644 index 000000000000..8ebf289eb7d7 --- /dev/null +++ b/test/Transforms/InstCombine/bitcount.ll @@ -0,0 +1,19 @@ +; Tests to make sure bit counts of constants are folded +; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep {ret i32 19} +; RUN: llvm-as < %s | opt -instcombine | llvm-dis | \ +; RUN: grep -v declare | not grep llvm.ct + +declare i31 @llvm.ctpop.i31(i31 %val) +declare i32 @llvm.cttz.i32(i32 %val) +declare i33 @llvm.ctlz.i33(i33 %val) + +define i32 @test(i32 %A) { + %c1 = call i31 @llvm.ctpop.i31(i31 12415124) + %c2 = call i32 @llvm.cttz.i32(i32 87359874) + %c3 = call i33 @llvm.ctlz.i33(i33 87359874) + %t1 = zext i31 %c1 to i32 + %t3 = trunc i33 %c3 to i32 + %r1 = add i32 %t1, %c2 + %r2 = add i32 %r1, %t3 + ret i32 %r2 +} |