llvm/test/Transforms/InstCombine/udiv_select_to_select_shift.ll
2007-08-15 13:36:28 +00:00

18 lines
578 B
LLVM

; 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 | count 1
; RUN: grep lshr %t | count 2
; RUN: ignore grep udiv %t | count 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
}