diff options
Diffstat (limited to 'test/Transforms/InstCombine/udiv_select_to_select_shift.ll')
| -rw-r--r-- | test/Transforms/InstCombine/udiv_select_to_select_shift.ll | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/test/Transforms/InstCombine/udiv_select_to_select_shift.ll b/test/Transforms/InstCombine/udiv_select_to_select_shift.ll new file mode 100644 index 0000000..fe05741 --- /dev/null +++ b/test/Transforms/InstCombine/udiv_select_to_select_shift.ll @@ -0,0 +1,17 @@ +; Test that this transform works: +; udiv X, (Select Cond, C1, C2) --> Select Cond, (shr X, C1), (shr X, C2) +; +; RUN: llvm-as < %s | opt -instcombine | llvm-dis -f -o %t +; RUN: grep select %t | wc -l | grep 1 +; RUN: grep lshr %t | wc -l | grep 2 +; RUN: ignore grep udiv %t | wc -l | grep 0 + +define i64 @test(i64 %X, i1 %Cond ) { +entry: + %divisor1 = select i1 %Cond, i64 8, i64 16 + %quotient1 = udiv i64 %X, %divisor1 + %divisor2 = select i1 %Cond, i64 8, i64 0 + %quotient2 = udiv i64 %X, %divisor2 + %sum = add i64 %quotient1, %quotient2 + ret i64 %sum +} |