File: neg-alloca.ll

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llvm-toolchain-20 1%3A20.1.8-1
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -passes=instcombine -S | FileCheck %s
declare void @use(ptr)

define void @foo(i64 %X) {
; Currently we cannot handle expressions of the form Offset - X * Scale.
; CHECK-LABEL: @foo(
; CHECK-NEXT:    [[TMP1:%.*]] = shl i64 [[X:%.*]], 2
; CHECK-NEXT:    [[TMP2:%.*]] = sub i64 24, [[TMP1]]
; CHECK-NEXT:    [[TMP3:%.*]] = alloca i8, i64 [[TMP2]], align 4
; CHECK-NEXT:    call void @use(ptr nonnull [[TMP3]])
; CHECK-NEXT:    ret void
;
  %1 = mul nsw i64 %X, -4
  %2 = add nsw i64 %1, 24
  %3 = alloca i8, i64 %2, align 4
  call void @use(ptr %3)
  ret void
}