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[clang] Handle lround/llround builtins 

As for other floating-point rounding builtins that can be optimized
when build with -fno-math-errno, this patch adds support for lround
and llround.  It currently only optimize for AArch64 backend.

Reviewed By: efriedma

Differential Revision: https://reviews.llvm.org/D61392

llvm-svn: 360896
This commit is contained in:
Adhemerval Zanella 2019-05-16 13:43:25 +00:00
parent af8cda15de
commit 0d9dcd7bf0
4 changed files with 43 additions and 12 deletions
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21
clang/lib/CodeGen/CGBuiltin.cpp
View File

@ -1721,6 +1721,27 @@ RValue CodeGenFunction::EmitBuiltinExpr(const GlobalDecl GD, unsigned BuiltinID,
case Builtin::BI__builtin_truncl:
return RValue::get(emitUnaryBuiltin(*this, E, Intrinsic::trunc));
case Builtin::BIlround:
case Builtin::BIlroundf:
case Builtin::BIlroundl:
case Builtin::BI__builtin_lround:
case Builtin::BI__builtin_lroundf:
case Builtin::BI__builtin_lroundl: {
llvm::Type *ResultType = ConvertType(E->getType());
int Width = ResultType->getPrimitiveSizeInBits();
return RValue::get(emitUnaryBuiltin(*this, E,
Width == 32 ? Intrinsic::lround_i32
: Intrinsic::lround_i64));
}
case Builtin::BIllround:
case Builtin::BIllroundf:
case Builtin::BIllroundl:
case Builtin::BI__builtin_llround:
case Builtin::BI__builtin_llroundf:
case Builtin::BI__builtin_llroundl:
return RValue::get(emitUnaryBuiltin(*this, E, Intrinsic::llround));
default:
break;
}

10
clang/test/CodeGen/builtins.c
View File

@ -256,6 +256,8 @@ void test_float_builtin_ops(float F, double D, long double LD) {
volatile float resf;
volatile double resd;
volatile long double resld;
volatile long int resli;
volatile long long int reslli;
resf = __builtin_fmodf(F,F);
// CHECK: frem float
@ -380,6 +382,14 @@ void test_float_builtin_ops(float F, double D, long double LD) {
resld = __builtin_roundl(LD);
// CHECK: call x86_fp80 @llvm.round.f80
resli = __builtin_lroundf (F);
// CHECK: call i64 @llvm.lround.i64.f32
resli = __builtin_lround (D);
// CHECK: call i64 @llvm.lround.i64.f64
resli = __builtin_lroundl (LD);
// CHECK: call i64 @llvm.lround.i64.f80
}
// __builtin_longjmp isn't supported on all platforms, so only test it on X86.

12
clang/test/CodeGen/math-builtins.c
View File

@ -362,9 +362,9 @@ void foo(double *d, float f, float *fp, long double *l, int *i, const char *c) {
__builtin_llround(f); __builtin_llroundf(f); __builtin_llroundl(f);
// NO__ERRNO: declare i64 @llround(double) [[READNONE]]
// NO__ERRNO: declare i64 @llroundf(float) [[READNONE]]
// NO__ERRNO: declare i64 @llroundl(x86_fp80) [[READNONE]]
// NO__ERRNO: declare i64 @llvm.llround.f64(double) [[READNONE_INTRINSIC]]
// NO__ERRNO: declare i64 @llvm.llround.f32(float) [[READNONE_INTRINSIC]]
// NO__ERRNO: declare i64 @llvm.llround.f80(x86_fp80) [[READNONE_INTRINSIC]]
// HAS_ERRNO: declare i64 @llround(double) [[NOT_READNONE]]
// HAS_ERRNO: declare i64 @llroundf(float) [[NOT_READNONE]]
// HAS_ERRNO: declare i64 @llroundl(x86_fp80) [[NOT_READNONE]]
@ -425,9 +425,9 @@ void foo(double *d, float f, float *fp, long double *l, int *i, const char *c) {
__builtin_lround(f); __builtin_lroundf(f); __builtin_lroundl(f);
// NO__ERRNO: declare i64 @lround(double) [[READNONE]]
// NO__ERRNO: declare i64 @lroundf(float) [[READNONE]]
// NO__ERRNO: declare i64 @lroundl(x86_fp80) [[READNONE]]
// NO__ERRNO: declare i64 @llvm.lround.i64.f64(double) [[READNONE_INTRINSIC]]
// NO__ERRNO: declare i64 @llvm.lround.i64.f32(float) [[READNONE_INTRINSIC]]
// NO__ERRNO: declare i64 @llvm.lround.i64.f80(x86_fp80) [[READNONE_INTRINSIC]]
// HAS_ERRNO: declare i64 @lround(double) [[NOT_READNONE]]
// HAS_ERRNO: declare i64 @lroundf(float) [[NOT_READNONE]]
// HAS_ERRNO: declare i64 @lroundl(x86_fp80) [[NOT_READNONE]]

12
clang/test/CodeGen/math-libcalls.c
View File

@ -317,9 +317,9 @@ void foo(double *d, float f, float *fp, long double *l, int *i, const char *c) {
llround(f); llroundf(f); llroundl(f);
// NO__ERRNO: declare i64 @llround(double) [[READNONE]]
// NO__ERRNO: declare i64 @llroundf(float) [[READNONE]]
// NO__ERRNO: declare i64 @llroundl(x86_fp80) [[READNONE]]
// NO__ERRNO: declare i64 @llvm.llround.f64(double) [[READNONE_INTRINSIC]]
// NO__ERRNO: declare i64 @llvm.llround.f32(float) [[READNONE_INTRINSIC]]
// NO__ERRNO: declare i64 @llvm.llround.f80(x86_fp80) [[READNONE_INTRINSIC]]
// HAS_ERRNO: declare i64 @llround(double) [[NOT_READNONE]]
// HAS_ERRNO: declare i64 @llroundf(float) [[NOT_READNONE]]
// HAS_ERRNO: declare i64 @llroundl(x86_fp80) [[NOT_READNONE]]
@ -380,9 +380,9 @@ void foo(double *d, float f, float *fp, long double *l, int *i, const char *c) {
lround(f); lroundf(f); lroundl(f);
// NO__ERRNO: declare i64 @lround(double) [[READNONE]]
// NO__ERRNO: declare i64 @lroundf(float) [[READNONE]]
// NO__ERRNO: declare i64 @lroundl(x86_fp80) [[READNONE]]
// NO__ERRNO: declare i64 @llvm.lround.i64.f64(double) [[READNONE_INTRINSIC]]
// NO__ERRNO: declare i64 @llvm.lround.i64.f32(float) [[READNONE_INTRINSIC]]
// NO__ERRNO: declare i64 @llvm.lround.i64.f80(x86_fp80) [[READNONE_INTRINSIC]]
// HAS_ERRNO: declare i64 @lround(double) [[NOT_READNONE]]
// HAS_ERRNO: declare i64 @lroundf(float) [[NOT_READNONE]]
// HAS_ERRNO: declare i64 @lroundl(x86_fp80) [[NOT_READNONE]]