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Revert "Revert "[builtins] Rounding mode support for addxf3/subxf3""

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Test failure fixed.

This reverts commit e204d244badb2e9765a1020f41c773f63da208f4.

llvm-svn: 371003
This commit is contained in:
Yi Kong 2019-09-05 01:05:05 +00:00
parent 473d0d7f56
commit 33b8a55329
14 changed files with 261 additions and 17 deletions
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3
compiler-rt/lib/builtins/CMakeLists.txt
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@ -97,6 +97,7 @@ set(GENERIC_SOURCES
floatunsisf.c
floatuntidf.c
floatuntisf.c
fp_mode.c
int_util.c
lshrdi3.c
lshrti3.c
@ -306,6 +307,7 @@ set(i386_SOURCES ${i386_SOURCES} ${x86_ARCH_SOURCES})
set(i686_SOURCES ${i686_SOURCES} ${x86_ARCH_SOURCES})
set(arm_SOURCES
arm/fp_mode.c
arm/bswapdi2.S
arm/bswapsi2.S
arm/clzdi2.S
@ -451,6 +453,7 @@ endif()
set(aarch64_SOURCES
${GENERIC_TF_SOURCES}
${GENERIC_SOURCES}
aarch64/fp_mode.c
)
if (MINGW)

59
compiler-rt/lib/builtins/aarch64/fp_mode.c Normal file
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@ -0,0 +1,59 @@
//===----- lib/aarch64/fp_mode.c - Floaing-point mode utilities ---*- C -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include <stdint.h>
#include "../fp_mode.h"
#define AARCH64_TONEAREST 0x0
#define AARCH64_UPWARD 0x1
#define AARCH64_DOWNWARD 0x2
#define AARCH64_TOWARDZERO 0x3
#define AARCH64_RMODE_MASK (AARCH64_TONEAREST | AARCH64_UPWARD | \
AARCH64_DOWNWARD | AARCH64_TOWARDZERO)
#define AARCH64_RMODE_SHIFT 22
#define AARCH64_INEXACT 0x10
#ifndef __ARM_FP
// For soft float targets, allow changing rounding mode by overriding the weak
// __aarch64_fe_default_rmode symbol.
FE_ROUND_MODE __attribute__((weak)) __aarch64_fe_default_rmode = FE_TONEAREST;
#endif
FE_ROUND_MODE __fe_getround() {
#ifdef __ARM_FP
uint64_t fpcr;
__asm__ __volatile__("mrs %0, fpcr" : "=r" (fpcr));
fpcr = fpcr >> AARCH64_RMODE_SHIFT & AARCH64_RMODE_MASK;
switch (fpcr) {
case AARCH64_UPWARD:
return FE_UPWARD;
case AARCH64_DOWNWARD:
return FE_DOWNWARD;
case AARCH64_TOWARDZERO:
return FE_TOWARDZERO;
case AARCH64_TONEAREST:
default:
return FE_TONEAREST;
}
#else
return __aarch64_fe_default_rmode;
#endif
}
int __fe_raise_inexact() {
#ifdef __ARM_FP
uint64_t fpsr;
__asm__ __volatile__("mrs %0, fpsr" : "=r" (fpsr));
__asm__ __volatile__("msr fpsr, %0" : : "ri" (fpsr | AARCH64_INEXACT));
return 0;
#else
return 0;
#endif
}

3
compiler-rt/lib/builtins/adddf3.c
View File

@ -6,8 +6,7 @@
//
//===----------------------------------------------------------------------===//
//
// This file implements double-precision soft-float addition with the IEEE-754
// default rounding (to nearest, ties to even).
// This file implements double-precision soft-float addition.
//
//===----------------------------------------------------------------------===//

3
compiler-rt/lib/builtins/addsf3.c
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@ -6,8 +6,7 @@
//
//===----------------------------------------------------------------------===//
//
// This file implements single-precision soft-float addition with the IEEE-754
// default rounding (to nearest, ties to even).
// This file implements single-precision soft-float addition.
//
//===----------------------------------------------------------------------===//

3
compiler-rt/lib/builtins/addtf3.c
View File

@ -6,8 +6,7 @@
//
//===----------------------------------------------------------------------===//
//
// This file implements quad-precision soft-float addition with the IEEE-754
// default rounding (to nearest, ties to even).
// This file implements quad-precision soft-float addition.
//
//===----------------------------------------------------------------------===//

59
compiler-rt/lib/builtins/arm/fp_mode.c Normal file
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@ -0,0 +1,59 @@
//===----- lib/arm/fp_mode.c - Floaing-point mode utilities -------*- C -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include <stdint.h>
#include "../fp_mode.h"
#define ARM_TONEAREST 0x0
#define ARM_UPWARD 0x1
#define ARM_DOWNWARD 0x2
#define ARM_TOWARDZERO 0x3
#define ARM_RMODE_MASK (ARM_TONEAREST | ARM_UPWARD | \
ARM_DOWNWARD | ARM_TOWARDZERO)
#define ARM_RMODE_SHIFT 22
#define ARM_INEXACT 0x1000
#ifndef __ARM_FP
// For soft float targets, allow changing rounding mode by overriding the weak
// __arm_fe_default_rmode symbol.
FE_ROUND_MODE __attribute__((weak)) __arm_fe_default_rmode = FE_TONEAREST;
#endif
FE_ROUND_MODE __fe_getround() {
#ifdef __ARM_FP
uint32_t fpscr;
__asm__ __volatile__("vmrs %0, fpscr" : "=r" (fpscr));
fpscr = fpscr >> ARM_RMODE_SHIFT & ARM_RMODE_MASK;
switch (fpscr) {
case ARM_UPWARD:
return FE_UPWARD;
case ARM_DOWNWARD:
return FE_DOWNWARD;
case ARM_TOWARDZERO:
return FE_TOWARDZERO;
case ARM_TONEAREST:
default:
return FE_TONEAREST;
}
#else
return __arm_fe_default_rmode;
#endif
}
int __fe_raise_inexact() {
#ifdef __ARM_FP
uint32_t fpscr;
__asm__ __volatile__("vmrs %0, fpscr" : "=r" (fpscr));
__asm__ __volatile__("vmsr fpscr, %0" : : "ri" (fpscr | ARM_INEXACT));
return 0;
#else
return 0;
#endif
}

23
compiler-rt/lib/builtins/fp_add_impl.inc
View File

@ -12,6 +12,7 @@
//===----------------------------------------------------------------------===//
#include "fp_lib.h"
#include "fp_mode.h"
static __inline fp_t __addXf3__(fp_t a, fp_t b) {
rep_t aRep = toRep(a);
@ -149,9 +150,23 @@ static __inline fp_t __addXf3__(fp_t a, fp_t b) {
// Perform the final rounding. The result may overflow to infinity, but
// that is the correct result in that case.
if (roundGuardSticky > 0x4)
result++;
if (roundGuardSticky == 0x4)
result += result & 1;
switch (__fe_getround()) {
case FE_TONEAREST:
if (roundGuardSticky > 0x4)
result++;
if (roundGuardSticky == 0x4)
result += result & 1;
break;
case FE_DOWNWARD:
if (resultSign && roundGuardSticky) result++;
break;
case FE_UPWARD:
if (!resultSign && roundGuardSticky) result++;
break;
case FE_TOWARDZERO:
break;
}
if (roundGuardSticky)
__fe_raise_inexact();
return fromRep(result);
}

24
compiler-rt/lib/builtins/fp_mode.c Normal file
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@ -0,0 +1,24 @@
//===----- lib/fp_mode.c - Floaing-point environment mode utilities --C -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file provides a default implementation of fp_mode.h for architectures
// that does not support or does not have an implementation of floating point
// environment mode.
//
//===----------------------------------------------------------------------===//
#include "fp_mode.h"
// IEEE-754 default rounding (to nearest, ties to even).
FE_ROUND_MODE __fe_getround() {
return FE_TONEAREST;
}
int __fe_raise_inexact() {
return 0;
}

29
compiler-rt/lib/builtins/fp_mode.h Normal file
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@ -0,0 +1,29 @@
//===----- lib/fp_mode.h - Floaing-point environment mode utilities --C -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file is not part of the interface of this library.
//
// This file defines an interface for accessing hardware floating point
// environment mode.
//
//===----------------------------------------------------------------------===//
#ifndef FP_MODE
#define FP_MODE
typedef enum {
FE_TONEAREST,
FE_DOWNWARD,
FE_UPWARD,
FE_TOWARDZERO
} FE_ROUND_MODE;
FE_ROUND_MODE __fe_getround();
int __fe_raise_inexact();
#endif // FP_MODE_H

3
compiler-rt/lib/builtins/subdf3.c
View File

@ -6,8 +6,7 @@
//
//===----------------------------------------------------------------------===//
//
// This file implements double-precision soft-float subtraction with the
// IEEE-754 default rounding (to nearest, ties to even).
// This file implements double-precision soft-float subtraction.
//
//===----------------------------------------------------------------------===//

3
compiler-rt/lib/builtins/subsf3.c
View File

@ -6,8 +6,7 @@
//
//===----------------------------------------------------------------------===//
//
// This file implements single-precision soft-float subtraction with the
// IEEE-754 default rounding (to nearest, ties to even).
// This file implements single-precision soft-float subtraction.
//
//===----------------------------------------------------------------------===//

3
compiler-rt/lib/builtins/subtf3.c
View File

@ -6,8 +6,7 @@
//
//===----------------------------------------------------------------------===//
//
// This file implements quad-precision soft-float subtraction with the
// IEEE-754 default rounding (to nearest, ties to even).
// This file implements quad-precision soft-float subtraction.
//
//===----------------------------------------------------------------------===//

33
compiler-rt/test/builtins/Unit/addtf3_test.c
View File

@ -11,11 +11,12 @@
//
//===----------------------------------------------------------------------===//
#include "int_lib.h"
#include <fenv.h>
#include <stdio.h>
#if __LDBL_MANT_DIG__ == 113
#include "int_lib.h"
#include "fp_test.h"
// Returns: a + b
@ -74,6 +75,36 @@ int main()
UINT64_C(0x61e58dd6c51eb77c)))
return 1;
#if (defined(__arm__) || defined(__aarch64__)) && defined(__ARM_FP)
// Rounding mode tests on supported architectures
const long double m = 1234.0L, n = 0.01L;
fesetround(FE_UPWARD);
if (test__addtf3(m, n,
UINT64_C(0x40093480a3d70a3d),
UINT64_C(0x70a3d70a3d70a3d8)))
return 1;
fesetround(FE_DOWNWARD);
if (test__addtf3(m, n,
UINT64_C(0x40093480a3d70a3d),
UINT64_C(0x70a3d70a3d70a3d7)))
return 1;
fesetround(FE_TOWARDZERO);
if (test__addtf3(m, n,
UINT64_C(0x40093480a3d70a3d),
UINT64_C(0x70a3d70a3d70a3d7)))
return 1;
fesetround(FE_TONEAREST);
if (test__addtf3(m, n,
UINT64_C(0x40093480a3d70a3d),
UINT64_C(0x70a3d70a3d70a3d7)))
return 1;
#endif
#else
printf("skipped\n");

30
compiler-rt/test/builtins/Unit/subtf3_test.c
View File

@ -11,6 +11,7 @@
//
//===----------------------------------------------------------------------===//
#include <fenv.h>
#include <stdio.h>
#if __LDBL_MANT_DIG__ == 113
@ -67,6 +68,35 @@ int main()
UINT64_C(0xa44a7bca780a166c)))
return 1;
#if (defined(__arm__) || defined(__aarch64__)) && defined(__ARM_FP)
// Rounding mode tests on supported architectures
const long double m = 1234.02L, n = 0.01L;
fesetround(FE_UPWARD);
if (test__subtf3(m, n,
UINT64_C(0x40093480a3d70a3d),
UINT64_C(0x70a3d70a3d70a3d7)))
return 1;
fesetround(FE_DOWNWARD);
if (test__subtf3(m, n,
UINT64_C(0x40093480a3d70a3d),
UINT64_C(0x70a3d70a3d70a3d6)))
return 1;
fesetround(FE_TOWARDZERO);
if (test__subtf3(m, n,
UINT64_C(0x40093480a3d70a3d),
UINT64_C(0x70a3d70a3d70a3d6)))
return 1;
fesetround(FE_TONEAREST);
if (test__subtf3(m, n,
UINT64_C(0x40093480a3d70a3d),
UINT64_C(0x70a3d70a3d70a3d7)))
return 1;
#endif
#else
printf("skipped\n");