clang/test/CodeGen/non-power-of-2-alignment-assumptions.c

   1 // NOTE: Assertions have been autogenerated by utils/update_cc_test_checks.py
   2 // RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -emit-llvm %s -o - | FileCheck %s
   3
   4 void *__attribute__((alloc_align(1))) alloc(int align);
   5
   6 // CHECK-LABEL: @t0(
   7 // CHECK-NEXT:  entry:
   8 // CHECK-NEXT:    [[ALIGN_ADDR:%.*]] = alloca i32, align 4
   9 // CHECK-NEXT:    store i32 [[ALIGN:%.*]], ptr [[ALIGN_ADDR]], align 4
  10 // CHECK-NEXT:    [[TMP0:%.*]] = load i32, ptr [[ALIGN_ADDR]], align 4
  11 // CHECK-NEXT:    [[CALL:%.*]] = call ptr @alloc(i32 noundef [[TMP0]])
  12 // CHECK-NEXT:    [[CASTED_ALIGN:%.*]] = zext i32 [[TMP0]] to i64
  13 // CHECK-NEXT:    call void @llvm.assume(i1 true) [ "align"(ptr [[CALL]], i64 [[CASTED_ALIGN]]) ]
  14 // CHECK-NEXT:    ret void
  15 //
  16 void t0(int align) {
  17   alloc(align);
  18 }
  19 // CHECK-LABEL: @t1(
  20 // CHECK-NEXT:  entry:
  21 // CHECK-NEXT:    [[ALIGN_ADDR:%.*]] = alloca i32, align 4
  22 // CHECK-NEXT:    store i32 [[ALIGN:%.*]], ptr [[ALIGN_ADDR]], align 4
  23 // CHECK-NEXT:    [[CALL:%.*]] = call ptr @alloc(i32 noundef 7)
  24 // CHECK-NEXT:    call void @llvm.assume(i1 true) [ "align"(ptr [[CALL]], i64 7) ]
  25 // CHECK-NEXT:    ret void
  26 //
  27 void t1(int align) {
  28   alloc(7);
  29 }
  30 // CHECK-LABEL: @t2(
  31 // CHECK-NEXT:  entry:
  32 // CHECK-NEXT:    [[ALIGN_ADDR:%.*]] = alloca i32, align 4
  33 // CHECK-NEXT:    store i32 [[ALIGN:%.*]], ptr [[ALIGN_ADDR]], align 4
  34 // CHECK-NEXT:    [[CALL:%.*]] = call align 8 ptr @alloc(i32 noundef 8)
  35 // CHECK-NEXT:    ret void
  36 //
  37 void t2(int align) {
  38   alloc(8);
  39 }