Home | History | Annotate | Download | only in InstCombine
      1 ; This test ensures that "strength reduction" of conditional expressions are
      2 ; working.  Basically this boils down to converting setlt,gt,le,ge instructions
      3 ; into equivalent setne,eq instructions.
      4 ;
      5 ; RUN: opt < %s -instcombine -S | \
      6 ; RUN:    grep -v "icmp eq" | grep -v "icmp ne" | not grep icmp
      7 ; END.
      8 
      9 define i1 @test1(i32 %A) {
     10         ; setne %A, 0
     11         %B = icmp uge i32 %A, 1         ; <i1> [#uses=1]
     12         ret i1 %B
     13 }
     14 
     15 define i1 @test2(i32 %A) {
     16        ; setne %A, 0
     17         %B = icmp ugt i32 %A, 0         ; <i1> [#uses=1]
     18         ret i1 %B
     19 }
     20 
     21 define i1 @test3(i8 %A) {
     22         ; setne %A, -128
     23         %B = icmp sge i8 %A, -127               ; <i1> [#uses=1]
     24         ret i1 %B
     25 }
     26 
     27 define i1 @test4(i8 %A) {
     28         ; setne %A, 127 
     29         %B = icmp sle i8 %A, 126                ; <i1> [#uses=1]
     30         ret i1 %B
     31 }
     32 
     33 define i1 @test5(i8 %A) {
     34         ; setne %A, 127
     35         %B = icmp slt i8 %A, 127                ; <i1> [#uses=1]
     36         ret i1 %B
     37 }
     38