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[UnitTests] Tests for __builtin_flt_rounds and __builtin_set_flt_rounds (#48)
These tests check setting and querying rounding mode using builtin functions. Pull request: #48
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‎MultiSource/UnitTests/CMakeLists.txt

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@@ -2,3 +2,4 @@ add_subdirectory(C++11)
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if(ARCH STREQUAL "Mips")
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add_subdirectory(Mips)
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endif()
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add_subdirectory(Float)

‎MultiSource/UnitTests/Float/CMakeLists.txt

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# Tests in Rounding can run only if the target implements builtin functions for
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# manipulation of rounding mode.
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set(SUPPORTED_ARCHS x86 AArch64)
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if(ARCH IN_LIST SUPPORTED_ARCHS)
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add_subdirectory(rounding)
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endif()

‎MultiSource/UnitTests/Float/Makefile

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# MultiSource/UnitTests/Float Makefile: Build all subdirectories automatically
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LEVEL = ../../..
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PARALLEL_DIRS :=
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# Tests in 'rounding' can run only if the target implements builtin functions
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# for rounding mode manipulation.
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ifneq (, $filter($(ARCH), X86_64 AArch64)
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PARALLEL_DIRS += rounding
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endif
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include $(LEVEL)/Makefile.config
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include $(LEVEL)/Makefile.programs

‎MultiSource/UnitTests/Float/rounding/CMakeLists.txt

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llvm_multisource(rounding)

‎MultiSource/UnitTests/Float/rounding/Makefile

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LEVEL = ../../../..
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PROG = rounding
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LDFLAGS =
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include ../../../Makefile.multisrc

‎MultiSource/UnitTests/Float/rounding/rounding-dynamic.c

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//===--- rounding.c --Tests for changing rounding mode ----------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// Helper function for rounding mode tests. It is intended for making a dynamic
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// rounding mode, unknown at compile time, from a constant values. It is in a
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// separate translation unit to prevent constant folding.
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//
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//===----------------------------------------------------------------------===//
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#include "rounding.h"
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int get_rounding_mode(int rm) {
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return rm;
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}

‎MultiSource/UnitTests/Float/rounding/rounding.c

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//===--- rounding.c --Tests for changing rounding mode ----------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// Checks setting/getting rounding mode using builtin functions
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// __builtin_flt_rounds and __builtin_set_flt_rounds.
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//
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//===----------------------------------------------------------------------===//
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#include "rounding.h"
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#include <stdio.h>
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#ifdef FLOAT_AVAILABLE
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// The "base" even values. They can be represented exactly and the lest
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// significant bit of the significand is zero.
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float PosEvenF = 0x1p+0F;
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float NegEvenF = -0x1p+0F;
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// The "base" odd values. They can be represented exactly and the lest
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// significant bit of the significand is one.
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float PosOddF = 0x1.000002p+0F;
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float NegOddF = -0x1.000002p+0F;
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// The values closest to the base ones with higher magnitude.
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float NextToPosEvenF = 0x1.000002p+0F;
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float NextToNegEvenF = -0x1.000002p+0F;
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float NextToPosOddF = 0x1.000004p+0F;
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float NextToNegOddF = -0x1.000004p+0F;
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// Value that is half of the lest significant bit of the "base" value.
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float PosDeltaF = 0x1.0p-24F;
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float NegDeltaF = -0x1.0p-24F;
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#endif
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#ifdef DOUBLE_AVAILABLE
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double PosEvenD = 0x1p+0;
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double NegEvenD = -0x1p+0;
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double PosOddD = 0x1.0000000000001p+0;
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double NegOddD = -0x1.0000000000001p+0;
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double NextToPosEvenD = 0x1.0000000000001p+0;
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double NextToNegEvenD = -0x1.0000000000001p+0;
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double NextToPosOddD = 0x1.0000000000002p+0;
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double NextToNegOddD = -0x1.0000000000002p+0;
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double PosDeltaD = 0x1.0p-52;
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double NegDeltaD = -0x1.0p-52;
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#endif
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// Check macros. They may be overriden to implement different reaction on
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// broken condition, rather that printing a message.
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#ifndef REPORT_STAGE
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#define REPORT_STAGE(x) printf(x)
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#endif
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#ifndef CHECK_INT_EQ
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#define CHECK_INT_EQ(VExp, VAct) \
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if (VExp != VAct) { \
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printf("Failure on line %i - expected: %d, actual: %d\n", \
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__LINE__, VExp, VAct); \
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}
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#endif
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#ifdef FLOAT_AVAILABLE
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#ifndef CHECK_FLT_EQ
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#define CHECK_FLT_EQ(VExp, VAct) \
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if (VExp != VAct) { \
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printf("Failure on line %i - expected: %a, actual: %a\n", \
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__LINE__, VExp, VAct); \
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}
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#endif
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#endif
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#ifdef DOUBLE_AVAILABLE
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#ifndef CHECK_DBL_EQ
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#define CHECK_DBL_EQ(VExp, VAct) \
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if (VExp != VAct) { \
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printf("Failure on line %i - expected: %la, actual: %la\n", \
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__LINE__, VExp, VAct); \
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}
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#endif
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#endif
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#ifdef FLOAT_AVAILABLE
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static void check_float_toward_zero() {
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float Res;
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Res = PosEvenF + PosDeltaF; // Rounds down
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CHECK_FLT_EQ(PosEvenF, Res);
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Res = NegEvenF + NegDeltaF; // Rounsd up
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CHECK_FLT_EQ(NegEvenF, Res);
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Res = PosOddF + PosDeltaF; // Rounsd down
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CHECK_FLT_EQ(PosOddF, Res);
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Res = NegOddF + NegDeltaF; // Rounsd up
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CHECK_FLT_EQ(NegOddF, Res);
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}
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static void check_float_toward_nearest() {
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float Res;
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Res = PosEvenF + PosDeltaF; // Rounsd down
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CHECK_FLT_EQ(PosEvenF, Res);
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Res = NegEvenF + NegDeltaF; // Pounds up
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CHECK_FLT_EQ(NegEvenF, Res);
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Res = PosOddF + PosDeltaF; // Rounsd up
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CHECK_FLT_EQ(NextToPosOddF, Res);
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Res = NegOddF + NegDeltaF; // Rounds down
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CHECK_FLT_EQ(NextToNegOddF, Res);
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}
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static void check_float_upward() {
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float Res;
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Res = PosEvenF + PosDeltaF; // Rounsd up
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CHECK_FLT_EQ(NextToPosEvenF, Res);
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Res = NegEvenF + NegDeltaF; // Pounds up
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CHECK_FLT_EQ(NegEvenF, Res);
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Res = PosOddF + PosDeltaF; // Rounsd up
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CHECK_FLT_EQ(NextToPosOddF, Res);
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Res = NegOddF + NegDeltaF; // Rounds up
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CHECK_FLT_EQ(NegOddF, Res);
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}
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static void check_float_downward() {
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float Res;
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Res = PosEvenF + PosDeltaF; // Rounsd down
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CHECK_FLT_EQ(PosEvenF, Res);
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Res = NegEvenF + NegDeltaF; // Pounds down
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CHECK_FLT_EQ(NextToNegEvenF, Res);
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Res = PosOddF + PosDeltaF; // Rounsd down
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CHECK_FLT_EQ(PosOddF, Res);
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Res = NegOddF + NegDeltaF; // Rounds down
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CHECK_FLT_EQ(NextToNegOddF, Res);
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}
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static void check_float() {
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#pragma STDC FENV_ACCESS ON
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REPORT_STAGE("Checking float\n");
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float Res;
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int RM;
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REPORT_STAGE(" towardzero\n");
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__builtin_set_flt_rounds(ROUNDING_TOWARDZERO);
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RM = __builtin_flt_rounds();
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CHECK_INT_EQ(ROUNDING_TOWARDZERO, RM);
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check_float_toward_zero();
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REPORT_STAGE(" tonearest\n");
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__builtin_set_flt_rounds(ROUNDING_TONEAREST);
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RM = __builtin_flt_rounds();
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CHECK_INT_EQ(ROUNDING_TONEAREST, RM);
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check_float_toward_nearest();
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REPORT_STAGE(" upward\n");
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__builtin_set_flt_rounds(ROUNDING_UPWARD);
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RM = __builtin_flt_rounds();
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CHECK_INT_EQ(ROUNDING_UPWARD, RM);
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check_float_upward();
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REPORT_STAGE(" downward\n");
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__builtin_set_flt_rounds(ROUNDING_DOWNWARD);
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RM = __builtin_flt_rounds();
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CHECK_INT_EQ(ROUNDING_DOWNWARD, RM);
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check_float_downward();
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REPORT_STAGE(" towardzero (dynamic)\n");
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RM = get_rounding_mode(ROUNDING_TOWARDZERO);
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__builtin_set_flt_rounds(RM);
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RM = __builtin_flt_rounds();
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CHECK_INT_EQ(ROUNDING_TOWARDZERO, RM);
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check_float_toward_zero();
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REPORT_STAGE(" tonearest (dynamic)\n");
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RM = get_rounding_mode(ROUNDING_TONEAREST);
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__builtin_set_flt_rounds(RM);
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RM = __builtin_flt_rounds();
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CHECK_INT_EQ(ROUNDING_TONEAREST, RM);
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check_float_toward_nearest();
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REPORT_STAGE(" upward (dynamic)\n");
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RM = get_rounding_mode(ROUNDING_UPWARD);
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__builtin_set_flt_rounds(RM);
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RM = __builtin_flt_rounds();
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CHECK_INT_EQ(ROUNDING_UPWARD, RM);
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check_float_upward();
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REPORT_STAGE(" downward (dynamic)\n");
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RM = get_rounding_mode(ROUNDING_DOWNWARD);
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__builtin_set_flt_rounds(RM);
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RM = __builtin_flt_rounds();
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CHECK_INT_EQ(ROUNDING_DOWNWARD, RM);
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check_float_downward();
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}
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#else
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static void check_float() {}
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#endif
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#ifdef DOUBLE_AVAILABLE
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static void check_double_toward_zero() {
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double Res;
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Res = PosEvenF + PosDeltaF; // Rounds down
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CHECK_DBL_EQ(PosEvenF, Res);
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Res = NegEvenF + NegDeltaF; // Rounsd up
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CHECK_DBL_EQ(NegEvenF, Res);
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Res = PosOddF + PosDeltaF; // Rounsd down
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CHECK_DBL_EQ(PosOddF, Res);
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Res = NegOddF + NegDeltaF; // Rounsd up
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CHECK_DBL_EQ(NegOddF, Res);
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}
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static void check_double_toward_nearest() {
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double Res;
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Res = PosEvenF + PosDeltaF; // Rounsd down
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CHECK_DBL_EQ(PosEvenF, Res);
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Res = NegEvenF + NegDeltaF; // Pounds up
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CHECK_DBL_EQ(NegEvenF, Res);
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Res = PosOddF + PosDeltaF; // Rounsd up
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CHECK_DBL_EQ(NextToPosOddF, Res);
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Res = NegOddF + NegDeltaF; // Rounds down
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CHECK_DBL_EQ(NextToNegOddF, Res);
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}
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static void check_double_upward() {
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double Res;
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Res = PosEvenF + PosDeltaF; // Rounsd up
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CHECK_DBL_EQ(NextToPosEvenF, Res);
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Res = NegEvenF + NegDeltaF; // Pounds up
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CHECK_DBL_EQ(NegEvenF, Res);
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Res = PosOddF + PosDeltaF; // Rounsd up
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CHECK_DBL_EQ(NextToPosOddF, Res);
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Res = NegOddF + NegDeltaF; // Rounds up
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CHECK_DBL_EQ(NegOddF, Res);
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}
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static void check_double_downward() {
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double Res;
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Res = PosEvenF + PosDeltaF; // Rounsd down
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CHECK_DBL_EQ(PosEvenF, Res);
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Res = NegEvenF + NegDeltaF; // Pounds down
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CHECK_DBL_EQ(NextToNegEvenF, Res);
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Res = PosOddF + PosDeltaF; // Rounsd down
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CHECK_DBL_EQ(PosOddF, Res);
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Res = NegOddF + NegDeltaF; // Rounds down
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CHECK_DBL_EQ(NextToNegOddF, Res);
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}
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static void check_double() {
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#pragma STDC FENV_ACCESS ON
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REPORT_STAGE("Checking double\n");
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double Res;
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int RM;
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REPORT_STAGE(" towardzero\n");
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__builtin_set_flt_rounds(ROUNDING_TOWARDZERO);
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RM = __builtin_flt_rounds();
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CHECK_INT_EQ(ROUNDING_TOWARDZERO, RM);
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check_double_toward_zero();
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REPORT_STAGE(" tonearest\n");
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__builtin_set_flt_rounds(ROUNDING_TONEAREST);
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RM = __builtin_flt_rounds();
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CHECK_INT_EQ(ROUNDING_TONEAREST, RM);
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check_double_toward_nearest();
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REPORT_STAGE(" upward\n");
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__builtin_set_flt_rounds(ROUNDING_UPWARD);
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RM = __builtin_flt_rounds();
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CHECK_INT_EQ(ROUNDING_UPWARD, RM);
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check_double_upward();
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REPORT_STAGE(" downward\n");
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__builtin_set_flt_rounds(ROUNDING_DOWNWARD);
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RM = __builtin_flt_rounds();
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CHECK_INT_EQ(ROUNDING_DOWNWARD, RM);
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check_double_downward();
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REPORT_STAGE(" towardzero (dynamic)\n");
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RM = get_rounding_mode(ROUNDING_TOWARDZERO);
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__builtin_set_flt_rounds(RM);
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RM = __builtin_flt_rounds();
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CHECK_INT_EQ(ROUNDING_TOWARDZERO, RM);
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check_double_toward_zero();
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REPORT_STAGE(" tonearest (dynamic)\n");
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RM = get_rounding_mode(ROUNDING_TONEAREST);
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__builtin_set_flt_rounds(RM);
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RM = __builtin_flt_rounds();
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CHECK_INT_EQ(ROUNDING_TONEAREST, RM);
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check_double_toward_nearest();
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REPORT_STAGE(" upward (dynamic)\n");
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RM = get_rounding_mode(ROUNDING_UPWARD);
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__builtin_set_flt_rounds(RM);
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RM = __builtin_flt_rounds();
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CHECK_INT_EQ(ROUNDING_UPWARD, RM);
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check_double_upward();
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REPORT_STAGE(" downward (dynamic)\n");
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RM = get_rounding_mode(ROUNDING_DOWNWARD);
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__builtin_set_flt_rounds(RM);
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RM = __builtin_flt_rounds();
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CHECK_INT_EQ(ROUNDING_DOWNWARD, RM);
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check_double_downward();
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}
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#else
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static void check_double() {}
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#endif
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int main(int argc, char *argv[]) {
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REPORT_STAGE("Checking rounding\n");
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check_float();
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check_double();
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}

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