File: udiv_select_to_select_shift.ll

package info (click to toggle)
llvm-3.0 3.0-10
  • links: PTS, VCS
  • area: main
  • in suites: wheezy
  • size: 75,412 kB
  • sloc: cpp: 468,043; asm: 109,345; ansic: 13,782; sh: 12,935; ml: 4,716; python: 4,351; perl: 2,096; makefile: 1,905; pascal: 1,578; exp: 389; xml: 283; lisp: 187; csh: 117
file content (17 lines) | stat: -rw-r--r-- 538 bytes parent folder | download | duplicates (13)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
; Test that this transform works:
; udiv X, (Select Cond, C1, C2) --> Select Cond, (shr X, C1), (shr X, C2)
;
; RUN: opt < %s -instcombine -S -o %t
; RUN:   not grep select %t
; RUN:   grep lshr %t | count 2
; RUN:   not grep udiv %t

define i64 @test(i64 %X, i1 %Cond ) {
entry:
        %divisor1 = select i1 %Cond, i64 16, i64 8
        %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
}