test/Transforms/InstCombine/assume-separate_storage.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -S -passes=instcombine < %s | FileCheck %s

declare void @llvm.assume(i1 noundef)

; Just something to let us check that separate_storage bundles don't break
; anything when given an operand that's not an instruction to fold.
@some_global = global i32 777

define void @simple_folding(ptr %a, ptr %b) {
; CHECK-LABEL: @simple_folding(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    call void @llvm.assume(i1 true) [ "separate_storage"(ptr [[A:%.*]], ptr [[B:%.*]]) ]
; CHECK-NEXT:    ret void
;
entry:
  %p1 = getelementptr i8, ptr %a, i64 123
  %p2 = getelementptr i8, ptr %b, i64 777
  call void @llvm.assume(i1 1) ["separate_storage"(ptr %p1, ptr %p2)]
  ret void
}

define i64 @folds_removed_operands(ptr %a, ptr %b, i64 %n1, i64 %n2) {
; CHECK-LABEL: @folds_removed_operands(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[REASS_ADD:%.*]] = shl i64 [[N2:%.*]], 1
; CHECK-NEXT:    [[Y:%.*]] = add i64 [[REASS_ADD]], [[N1:%.*]]
; CHECK-NEXT:    call void @llvm.assume(i1 true) [ "separate_storage"(ptr [[A:%.*]], ptr [[B:%.*]]) ]
; CHECK-NEXT:    ret i64 [[Y]]
;
entry:
  ; Ordinarily, n1 + n2 + n2 would get canonicalized into n1 + (n2 << 1) unless
  ; there's another use of n1 + n2. Make sure that we remember to put removed
  ; arguments to separate_storage bundles back on the worklist.
  %x = add i64 %n1, %n2
  %y = add i64 %x, %n2
  %p1 = getelementptr i8, ptr %a, i64 %x
  call void @llvm.assume(i1 1) ["separate_storage"(ptr %p1, ptr %b)]
  ret i64 %y
}

define void @handles_globals(ptr %a) {
; CHECK-LABEL: @handles_globals(
; CHECK-NEXT:    call void @llvm.assume(i1 true) [ "separate_storage"(ptr [[A:%.*]], ptr @some_global) ]
; CHECK-NEXT:    ret void
;
  %derived = getelementptr i8, ptr @some_global, i65 3
  call void @llvm.assume(i1 1) ["separate_storage"(ptr %a, ptr %derived)]
  ret void
}