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[FPEnv] Tests for rounding properties of constant evalution 

These are moved from D88498.

Differential Revision: https://reviews.llvm.org/D90026
This commit is contained in:
Serge Pavlov 2020-10-23 18:36:16 +07:00
parent 1df8d7b4f2
commit 08bb5d9196
3 changed files with 97 additions and 2 deletions
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45
clang/test/CodeGen/rounding-math.c Normal file
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@ -0,0 +1,45 @@
// RUN: %clang_cc1 -S -emit-llvm -ffp-exception-behavior=strict -Wno-unknown-pragmas %s -o - | FileCheck %s
// RUN: %clang_cc1 -S -emit-llvm -frounding-math -Wno-unknown-pragmas %s -o - | FileCheck %s
float PR47807 = -8.6563630030e-03;
// nextUp(1.F) == 0x1.000002p0F
struct S {
float f;
};
static struct S var_01 = {0x1.000001p0};
struct S *func_01() {
return &var_01;
}
struct S var_02 = {0x1.000001p0};
struct S *func_03() {
static struct S var_03 = {0x1.000001p0};
return &var_03;
}
// CHECK: @var_01 = {{.*}} %struct.S { float 1.000000e+00 }
// CHECK: @var_02 = {{.*}} %struct.S { float 1.000000e+00 }
// CHECK: @func_03.var_03 = {{.*}} %struct.S { float 1.000000e+00 }
#pragma STDC FENV_ROUND FE_UPWARD
static struct S var_04 = {0x1.000001p0};
struct S *func_04() {
return &var_04;
}
struct S var_05 = {0x1.000001p0};
struct S *func_06() {
static struct S var_06 = {0x1.000001p0};
return &var_06;
}
// CHECK: @var_04 = {{.*}} %struct.S { float 0x3FF0000020000000 }
// CHECK: @var_05 = {{.*}} %struct.S { float 0x3FF0000020000000 }
// CHECK: @func_06.var_06 = {{.*}} %struct.S { float 0x3FF0000020000000 }

13
clang/test/CodeGen/rounding-math.cpp Normal file
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@ -0,0 +1,13 @@
// RUN: %clang_cc1 -S -emit-llvm -triple i386-linux -Wno-unknown-pragmas -frounding-math %s -o - | FileCheck %s
constexpr float func_01(float x, float y) {
return x + y;
}
float V1 = func_01(1.0F, 0x0.000001p0F);
float V2 = 1.0F + 0x0.000001p0F;
float V3 = func_01(1.0F, 2.0F);
// CHECK: @V1 = {{.*}}global float 1.000000e+00, align 4
// CHECK: @V2 = {{.*}}global float 1.000000e+00, align 4
// CHECK: @V3 = {{.*}}global float 3.000000e+00, align 4

41
clang/test/SemaCXX/rounding-math.cpp
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@ -1,5 +1,5 @@
// RUN: %clang_cc1 -triple x86_64-linux -verify=norounding %s
// RUN: %clang_cc1 -triple x86_64-linux -verify=rounding %s -frounding-math
// RUN: %clang_cc1 -triple x86_64-linux -verify=norounding -Wno-unknown-pragmas %s
// RUN: %clang_cc1 -triple x86_64-linux -verify=rounding %s -frounding-math -Wno-unknown-pragmas
// rounding-no-diagnostics
#define fold(x) (__builtin_constant_p(x) ? (x) : (x))
@ -39,3 +39,40 @@ void g() {
int *h() {
return new int[int(-3 * (1.0 / 3.0))]; // norounding-error {{too large}}
}
// nextUp(1.F) == 0x1.000002p0F
static_assert(1.0F + 0x0.000001p0F == 0x1.0p0F, "");
char Arr01[1 + (1.0F + 0x0.000001p0F > 1.0F)];
static_assert(sizeof(Arr01) == 1, "");
struct S1 {
int : (1.0F + 0x0.000001p0F > 1.0F);
int f;
};
static_assert(sizeof(S1) == sizeof(int), "");
#pragma STDC FENV_ROUND FE_UPWARD
static_assert(1.0F + 0x0.000001p0F == 0x1.000002p0F, "");
char Arr01u[1 + (1.0F + 0x0.000001p0F > 1.0F)];
static_assert(sizeof(Arr01u) == 2, "");
struct S1u {
int : (1.0F + 0x0.000001p0F > 1.0F);
int f;
};
static_assert(sizeof(S1u) > sizeof(int), "");
#pragma STDC FENV_ROUND FE_DOWNWARD
static_assert(1.0F + 0x0.000001p0F == 1.0F, "");
char Arr01d[1 + (1.0F + 0x0.000001p0F > 1.0F)];
static_assert(sizeof(Arr01d) == 1, "");
struct S1d {
int : (1.0F + 0x0.000001p0F > 1.0F);
int f;
};
static_assert(sizeof(S1d) == sizeof(int), "");