test/Transforms/InstCombine/icmp-range.ll

; RUN: opt < %s -instcombine -S | FileCheck %s
; These should be InstSimplify checks, but most of the code
; is currently only in InstCombine.  TODO: move supporting code

; Definitely out of range
define i1 @test_nonzero(i32* nocapture readonly %arg) {
; CHECK-LABEL:test_nonzero
; CHECK: ret i1 true
  %val = load i32, i32* %arg, !range !0
  %rval = icmp ne i32 %val, 0
  ret i1 %rval
}
define i1 @test_nonzero2(i32* nocapture readonly %arg) {
; CHECK-LABEL:test_nonzero2
; CHECK: ret i1 false
  %val = load i32, i32* %arg, !range !0
  %rval = icmp eq i32 %val, 0
  ret i1 %rval
}

; Potentially in range
define i1 @test_nonzero3(i32* nocapture readonly %arg) {
; CHECK-LABEL: test_nonzero3
; Check that this does not trigger - it wouldn't be legal
; CHECK: icmp
  %val = load i32, i32* %arg, !range !1
  %rval = icmp ne i32 %val, 0
  ret i1 %rval
}

; Definitely in range
define i1 @test_nonzero4(i8* nocapture readonly %arg) {
; CHECK-LABEL: test_nonzero4
; CHECK: ret i1 false
  %val = load i8, i8* %arg, !range !2
  %rval = icmp ne i8 %val, 0
  ret i1 %rval
}

define i1 @test_nonzero5(i8* nocapture readonly %arg) {
; CHECK-LABEL: test_nonzero5
; CHECK: ret i1 false
  %val = load i8, i8* %arg, !range !2
  %rval = icmp ugt i8 %val, 0
  ret i1 %rval
}

; Cheaper checks (most values in range meet requirements)
define i1 @test_nonzero6(i8* %argw) {
; CHECK-LABEL: test_nonzero6
; CHECK: icmp ne i8 %val, 0
  %val = load i8, i8* %argw, !range !3
  %rval = icmp sgt i8 %val, 0
  ret i1 %rval
}


!0 = !{i32 1, i32 6} 
!1 = !{i32 0, i32 6} 
!2 = !{i8 0, i8 1} 
!3 = !{i8 0, i8 6}