clang/test/CodeGen/alloc-align-attr.c

// NOTE: Assertions have been autogenerated by utils/update_cc_test_checks.py
// RUN: %clang_cc1 -triple x86_64-pc-linux -emit-llvm -o - %s | FileCheck %s

__INT32_TYPE__*m1(__INT32_TYPE__ i) __attribute__((alloc_align(1)));

// Condition where parameter to m1 is not size_t.
// CHECK-LABEL: @test1(
// CHECK-NEXT:  entry:
// CHECK-NEXT:    [[A_ADDR:%.*]] = alloca i32, align 4
// CHECK-NEXT:    store i32 [[A:%.*]], ptr [[A_ADDR]], align 4
// CHECK-NEXT:    [[TMP0:%.*]] = load i32, ptr [[A_ADDR]], align 4
// CHECK-NEXT:    [[CALL:%.*]] = call ptr @m1(i32 noundef [[TMP0]])
// CHECK-NEXT:    [[CASTED_ALIGN:%.*]] = zext i32 [[TMP0]] to i64
// CHECK-NEXT:    call void @llvm.assume(i1 true) [ "align"(ptr [[CALL]], i64 [[CASTED_ALIGN]]) ]
// CHECK-NEXT:    [[TMP1:%.*]] = load i32, ptr [[CALL]], align 4
// CHECK-NEXT:    ret i32 [[TMP1]]
//
__INT32_TYPE__ test1(__INT32_TYPE__ a) {
  return *m1(a);
}
// Condition where test2 param needs casting.
// CHECK-LABEL: @test2(
// CHECK-NEXT:  entry:
// CHECK-NEXT:    [[A_ADDR:%.*]] = alloca i64, align 8
// CHECK-NEXT:    store i64 [[A:%.*]], ptr [[A_ADDR]], align 8
// CHECK-NEXT:    [[TMP0:%.*]] = load i64, ptr [[A_ADDR]], align 8
// CHECK-NEXT:    [[CONV:%.*]] = trunc i64 [[TMP0]] to i32
// CHECK-NEXT:    [[CALL:%.*]] = call ptr @m1(i32 noundef [[CONV]])
// CHECK-NEXT:    [[CASTED_ALIGN:%.*]] = zext i32 [[CONV]] to i64
// CHECK-NEXT:    call void @llvm.assume(i1 true) [ "align"(ptr [[CALL]], i64 [[CASTED_ALIGN]]) ]
// CHECK-NEXT:    [[TMP1:%.*]] = load i32, ptr [[CALL]], align 4
// CHECK-NEXT:    ret i32 [[TMP1]]
//
__INT32_TYPE__ test2(__SIZE_TYPE__ a) {
  return *m1(a);
}
__INT32_TYPE__ *m2(__SIZE_TYPE__ i) __attribute__((alloc_align(1)));

// test3 param needs casting, but 'm2' is correct.
// CHECK-LABEL: @test3(
// CHECK-NEXT:  entry:
// CHECK-NEXT:    [[A_ADDR:%.*]] = alloca i32, align 4
// CHECK-NEXT:    store i32 [[A:%.*]], ptr [[A_ADDR]], align 4
// CHECK-NEXT:    [[TMP0:%.*]] = load i32, ptr [[A_ADDR]], align 4
// CHECK-NEXT:    [[CONV:%.*]] = sext i32 [[TMP0]] to i64
// CHECK-NEXT:    [[CALL:%.*]] = call ptr @m2(i64 noundef [[CONV]])
// CHECK-NEXT:    call void @llvm.assume(i1 true) [ "align"(ptr [[CALL]], i64 [[CONV]]) ]
// CHECK-NEXT:    [[TMP1:%.*]] = load i32, ptr [[CALL]], align 4
// CHECK-NEXT:    ret i32 [[TMP1]]
//
__INT32_TYPE__ test3(__INT32_TYPE__ a) {
  return *m2(a);
}

// Every type matches, canonical example.
// CHECK-LABEL: @test4(
// CHECK-NEXT:  entry:
// CHECK-NEXT:    [[A_ADDR:%.*]] = alloca i64, align 8
// CHECK-NEXT:    store i64 [[A:%.*]], ptr [[A_ADDR]], align 8
// CHECK-NEXT:    [[TMP0:%.*]] = load i64, ptr [[A_ADDR]], align 8
// CHECK-NEXT:    [[CALL:%.*]] = call ptr @m2(i64 noundef [[TMP0]])
// CHECK-NEXT:    call void @llvm.assume(i1 true) [ "align"(ptr [[CALL]], i64 [[TMP0]]) ]
// CHECK-NEXT:    [[TMP1:%.*]] = load i32, ptr [[CALL]], align 4
// CHECK-NEXT:    ret i32 [[TMP1]]
//
__INT32_TYPE__ test4(__SIZE_TYPE__ a) {
  return *m2(a);
}


struct Empty {};
struct MultiArgs { __INT64_TYPE__ a, b;};
// Struct parameter doesn't take up an IR parameter, 'i' takes up 1.
// Truncation to i64 is permissible, since alignments of greater than 2^64 are insane.
__INT32_TYPE__ *m3(struct Empty s, __int128_t i) __attribute__((alloc_align(2)));
// CHECK-LABEL: @test5(
// CHECK-NEXT:  entry:
// CHECK-NEXT:    [[A_ADDR:%.*]] = alloca i128, align 16
// CHECK-NEXT:    [[E:%.*]] = alloca [[STRUCT_EMPTY:%.*]], align 1
// CHECK-NEXT:    store i128 [[A:%.*]], ptr [[A_ADDR]], align 16
// CHECK-NEXT:    [[TMP0:%.*]] = load i128, ptr [[A_ADDR]], align 16
// CHECK-NEXT:    [[CALL:%.*]] = call ptr @m3(i128 noundef [[TMP0]])
// CHECK-NEXT:    [[CASTED_ALIGN:%.*]] = trunc i128 [[TMP0]] to i64
// CHECK-NEXT:    call void @llvm.assume(i1 true) [ "align"(ptr [[CALL]], i64 [[CASTED_ALIGN]]) ]
// CHECK-NEXT:    [[TMP1:%.*]] = load i32, ptr [[CALL]], align 4
// CHECK-NEXT:    ret i32 [[TMP1]]
//
__INT32_TYPE__ test5(__int128_t a) {
  struct Empty e;
  return *m3(e, a);
}
// Struct parameter takes up 2 parameters, 'i' takes up 1.
__INT32_TYPE__ *m4(struct MultiArgs s, __int128_t i) __attribute__((alloc_align(2)));
// CHECK-LABEL: @test6(
// CHECK-NEXT:  entry:
// CHECK-NEXT:    [[A_ADDR:%.*]] = alloca i128, align 16
// CHECK-NEXT:    [[E:%.*]] = alloca [[STRUCT_MULTIARGS:%.*]], align 8
// CHECK-NEXT:    store i128 [[A:%.*]], ptr [[A_ADDR]], align 16
// CHECK-NEXT:    [[TMP0:%.*]] = load i128, ptr [[A_ADDR]], align 16
// CHECK-NEXT:    [[TMP1:%.*]] = getelementptr inbounds nuw { i64, i64 }, ptr [[E]], i32 0, i32 0
// CHECK-NEXT:    [[TMP2:%.*]] = load i64, ptr [[TMP1]], align 8
// CHECK-NEXT:    [[TMP3:%.*]] = getelementptr inbounds nuw { i64, i64 }, ptr [[E]], i32 0, i32 1
// CHECK-NEXT:    [[TMP4:%.*]] = load i64, ptr [[TMP3]], align 8
// CHECK-NEXT:    [[CALL:%.*]] = call ptr @m4(i64 [[TMP2]], i64 [[TMP4]], i128 noundef [[TMP0]])
// CHECK-NEXT:    [[CASTED_ALIGN:%.*]] = trunc i128 [[TMP0]] to i64
// CHECK-NEXT:    call void @llvm.assume(i1 true) [ "align"(ptr [[CALL]], i64 [[CASTED_ALIGN]]) ]
// CHECK-NEXT:    [[TMP5:%.*]] = load i32, ptr [[CALL]], align 4
// CHECK-NEXT:    ret i32 [[TMP5]]
//
__INT32_TYPE__ test6(__int128_t a) {
  struct MultiArgs e;
  return *m4(e, a);
}