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llvm-project/clang/test/CodeGen/isfpclass.c
Aiden Grossman e2d7cd685d
[IR] Make dead_on_return attribute optionally sized 
This patch makes the dead_on_return parameter attribute optionally require a number
of bytes to be passed in to specify the number of bytes known to be dead
upon function return/unwind. This is aimed at enabling annotating the
this pointer in C++ destructors with dead_on_return in clang. We need
this to handle cases like the following:

```
struct X {
  int n;
  ~X() {
    this[n].n = 0;
  }
};
void f() {
  X xs[] = {42, -1};
}
```

Where we only certain that sizeof(X) bytes are dead upon return of ~X.
Otherwise DSE would be able to eliminate the store in ~X which would not
be correct.

This patch only does the wiring within IR. Future patches will make
clang emit correct sizing information and update DSE to only delete
stores to objects marked dead_on_return that are provably in bounds of
the number of bytes specified to be dead_on_return.

Reviewers: nikic, alinas, antoniofrighetto

Pull Request: https://github.com/llvm/llvm-project/pull/171712
2026-01-21 08:22:05 -08:00

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// NOTE: Assertions have been autogenerated by utils/update_cc_test_checks.py UTC_ARGS: --version 6
// RUN: %clang_cc1 -triple aarch64-linux-gnu -O1 -emit-llvm %s -o - | FileCheck %s
// CHECK-LABEL: define dso_local noundef i1 @check_isfpclass_finite(
// CHECK-SAME: float noundef [[X:%.*]]) local_unnamed_addr #[[ATTR0:[0-9]+]] {
// CHECK-NEXT: [[ENTRY:.*:]]
// CHECK-NEXT: [[TMP0:%.*]] = tail call float @llvm.fabs.f32(float [[X]])
// CHECK-NEXT: [[TMP1:%.*]] = fcmp one float [[TMP0]], 0x7FF0000000000000
// CHECK-NEXT: ret i1 [[TMP1]]
//
_Bool check_isfpclass_finite(float x) {
return __builtin_isfpclass(x, 504 /*Finite*/);
}
// CHECK-LABEL: define dso_local noundef i1 @check_isfpclass_finite_strict(
// CHECK-SAME: float noundef [[X:%.*]]) local_unnamed_addr #[[ATTR2:[0-9]+]] {
// CHECK-NEXT: [[ENTRY:.*:]]
// CHECK-NEXT: [[TMP0:%.*]] = tail call i1 @llvm.is.fpclass.f32(float [[X]], i32 504) #[[ATTR5:[0-9]+]]
// CHECK-NEXT: ret i1 [[TMP0]]
//
_Bool check_isfpclass_finite_strict(float x) {
#pragma STDC FENV_ACCESS ON
return __builtin_isfpclass(x, 504 /*Finite*/);
}
// CHECK-LABEL: define dso_local noundef i1 @check_isfpclass_nan_f32(
// CHECK-SAME: float noundef [[X:%.*]]) local_unnamed_addr #[[ATTR0]] {
// CHECK-NEXT: [[ENTRY:.*:]]
// CHECK-NEXT: [[TMP0:%.*]] = fcmp uno float [[X]], 0.000000e+00
// CHECK-NEXT: ret i1 [[TMP0]]
//
_Bool check_isfpclass_nan_f32(float x) {
return __builtin_isfpclass(x, 3 /*NaN*/);
}
// CHECK-LABEL: define dso_local noundef i1 @check_isfpclass_nan_f32_strict(
// CHECK-SAME: float noundef [[X:%.*]]) local_unnamed_addr #[[ATTR2]] {
// CHECK-NEXT: [[ENTRY:.*:]]
// CHECK-NEXT: [[TMP0:%.*]] = tail call i1 @llvm.is.fpclass.f32(float [[X]], i32 3) #[[ATTR5]]
// CHECK-NEXT: ret i1 [[TMP0]]
//
_Bool check_isfpclass_nan_f32_strict(float x) {
#pragma STDC FENV_ACCESS ON
return __builtin_isfpclass(x, 3 /*NaN*/);
}
// CHECK-LABEL: define dso_local noundef i1 @check_isfpclass_snan_f64(
// CHECK-SAME: double noundef [[X:%.*]]) local_unnamed_addr #[[ATTR0]] {
// CHECK-NEXT: [[ENTRY:.*:]]
// CHECK-NEXT: [[TMP0:%.*]] = tail call i1 @llvm.is.fpclass.f64(double [[X]], i32 1)
// CHECK-NEXT: ret i1 [[TMP0]]
//
_Bool check_isfpclass_snan_f64(double x) {
return __builtin_isfpclass(x, 1 /*SNaN*/);
}
// CHECK-LABEL: define dso_local noundef i1 @check_isfpclass_snan_f64_strict(
// CHECK-SAME: double noundef [[X:%.*]]) local_unnamed_addr #[[ATTR2]] {
// CHECK-NEXT: [[ENTRY:.*:]]
// CHECK-NEXT: [[TMP0:%.*]] = tail call i1 @llvm.is.fpclass.f64(double [[X]], i32 1) #[[ATTR5]]
// CHECK-NEXT: ret i1 [[TMP0]]
//
_Bool check_isfpclass_snan_f64_strict(double x) {
#pragma STDC FENV_ACCESS ON
return __builtin_isfpclass(x, 1 /*NaN*/);
}
// CHECK-LABEL: define dso_local noundef i1 @check_isfpclass_zero_f16(
// CHECK-SAME: half noundef [[X:%.*]]) local_unnamed_addr #[[ATTR0]] {
// CHECK-NEXT: [[ENTRY:.*:]]
// CHECK-NEXT: [[TMP0:%.*]] = fcmp oeq half [[X]], 0xH0000
// CHECK-NEXT: ret i1 [[TMP0]]
//
_Bool check_isfpclass_zero_f16(_Float16 x) {
return __builtin_isfpclass(x, 96 /*Zero*/);
}
// CHECK-LABEL: define dso_local noundef i1 @check_isfpclass_zero_f16_strict(
// CHECK-SAME: half noundef [[X:%.*]]) local_unnamed_addr #[[ATTR2]] {
// CHECK-NEXT: [[ENTRY:.*:]]
// CHECK-NEXT: [[TMP0:%.*]] = tail call i1 @llvm.is.fpclass.f16(half [[X]], i32 96) #[[ATTR5]]
// CHECK-NEXT: ret i1 [[TMP0]]
//
_Bool check_isfpclass_zero_f16_strict(_Float16 x) {
#pragma STDC FENV_ACCESS ON
return __builtin_isfpclass(x, 96 /*Zero*/);
}
// CHECK-LABEL: define dso_local noundef i1 @check_isnan(
// CHECK-SAME: float noundef [[X:%.*]]) local_unnamed_addr #[[ATTR2]] {
// CHECK-NEXT: [[ENTRY:.*:]]
// CHECK-NEXT: [[TMP0:%.*]] = tail call i1 @llvm.is.fpclass.f32(float [[X]], i32 3) #[[ATTR5]]
// CHECK-NEXT: ret i1 [[TMP0]]
//
_Bool check_isnan(float x) {
#pragma STDC FENV_ACCESS ON
return __builtin_isnan(x);
}
// CHECK-LABEL: define dso_local noundef i1 @check_isinf(
// CHECK-SAME: float noundef [[X:%.*]]) local_unnamed_addr #[[ATTR2]] {
// CHECK-NEXT: [[ENTRY:.*:]]
// CHECK-NEXT: [[TMP0:%.*]] = tail call i1 @llvm.is.fpclass.f32(float [[X]], i32 516) #[[ATTR5]]
// CHECK-NEXT: ret i1 [[TMP0]]
//
_Bool check_isinf(float x) {
#pragma STDC FENV_ACCESS ON
return __builtin_isinf(x);
}
// CHECK-LABEL: define dso_local noundef i1 @check_isfinite(
// CHECK-SAME: float noundef [[X:%.*]]) local_unnamed_addr #[[ATTR2]] {
// CHECK-NEXT: [[ENTRY:.*:]]
// CHECK-NEXT: [[TMP0:%.*]] = tail call i1 @llvm.is.fpclass.f32(float [[X]], i32 504) #[[ATTR5]]
// CHECK-NEXT: ret i1 [[TMP0]]
//
_Bool check_isfinite(float x) {
#pragma STDC FENV_ACCESS ON
return __builtin_isfinite(x);
}
// CHECK-LABEL: define dso_local noundef i1 @check_isnormal(
// CHECK-SAME: float noundef [[X:%.*]]) local_unnamed_addr #[[ATTR2]] {
// CHECK-NEXT: [[ENTRY:.*:]]
// CHECK-NEXT: [[TMP0:%.*]] = tail call i1 @llvm.is.fpclass.f32(float [[X]], i32 264) #[[ATTR5]]
// CHECK-NEXT: ret i1 [[TMP0]]
//
_Bool check_isnormal(float x) {
#pragma STDC FENV_ACCESS ON
return __builtin_isnormal(x);
}
typedef float __attribute__((ext_vector_type(4))) float4;
typedef double __attribute__((ext_vector_type(4))) double4;
typedef int __attribute__((ext_vector_type(4))) int4;
typedef long __attribute__((ext_vector_type(4))) long4;
// CHECK-LABEL: define dso_local range(i32 0, 2) <4 x i32> @check_isfpclass_nan_v4f32(
// CHECK-SAME: <4 x float> noundef [[X:%.*]]) local_unnamed_addr #[[ATTR0]] {
// CHECK-NEXT: [[ENTRY:.*:]]
// CHECK-NEXT: [[TMP0:%.*]] = fcmp uno <4 x float> [[X]], zeroinitializer
// CHECK-NEXT: [[TMP1:%.*]] = zext <4 x i1> [[TMP0]] to <4 x i32>
// CHECK-NEXT: ret <4 x i32> [[TMP1]]
//
int4 check_isfpclass_nan_v4f32(float4 x) {
return __builtin_isfpclass(x, 3 /*NaN*/);
}
// CHECK-LABEL: define dso_local range(i32 0, 2) <4 x i32> @check_isfpclass_nan_strict_v4f32(
// CHECK-SAME: <4 x float> noundef [[X:%.*]]) local_unnamed_addr #[[ATTR2]] {
// CHECK-NEXT: [[ENTRY:.*:]]
// CHECK-NEXT: [[TMP0:%.*]] = tail call <4 x i1> @llvm.is.fpclass.v4f32(<4 x float> [[X]], i32 3) #[[ATTR5]]
// CHECK-NEXT: [[TMP1:%.*]] = zext <4 x i1> [[TMP0]] to <4 x i32>
// CHECK-NEXT: ret <4 x i32> [[TMP1]]
//
int4 check_isfpclass_nan_strict_v4f32(float4 x) {
#pragma STDC FENV_ACCESS ON
return __builtin_isfpclass(x, 3 /*NaN*/);
}
// CHECK-LABEL: define dso_local void @check_isfpclass_nan_v4f64(
// CHECK-SAME: ptr dead_on_unwind noalias writable writeonly sret(<4 x i64>) align 16 captures(none) initializes((0, 32)) [[AGG_RESULT:%.*]], ptr noundef readonly captures(none) dead_on_return [[TMP0:%.*]]) local_unnamed_addr #[[ATTR3:[0-9]+]] {
// CHECK-NEXT: [[ENTRY:.*:]]
// CHECK-NEXT: [[X:%.*]] = load <4 x double>, ptr [[TMP0]], align 16, !tbaa [[CHAR_TBAA6:![0-9]+]]
// CHECK-NEXT: [[TMP1:%.*]] = fcmp uno <4 x double> [[X]], zeroinitializer
// CHECK-NEXT: [[TMP2:%.*]] = zext <4 x i1> [[TMP1]] to <4 x i64>
// CHECK-NEXT: store <4 x i64> [[TMP2]], ptr [[AGG_RESULT]], align 16, !tbaa [[CHAR_TBAA6]]
// CHECK-NEXT: ret void
//
long4 check_isfpclass_nan_v4f64(double4 x) {
return __builtin_isfpclass(x, 3 /*NaN*/);
}
//.
// CHECK: [[META4:![0-9]+]] = !{!"omnipotent char", [[META5:![0-9]+]], i64 0}
// CHECK: [[META5]] = !{!"Simple C/C++ TBAA"}
// CHECK: [[CHAR_TBAA6]] = !{[[META4]], [[META4]], i64 0}
//.
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