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Add a target hook for FLT_EVAL_METHOD and use it to set the value on x86 with sse disabled. 

x87 math evaluates everything with 80 bits precision, so we have to set FLT_EVAL_METHOD
to "2".

llvm-svn: 147311
This commit is contained in:
Benjamin Kramer 2011-12-28 15:47:06 +00:00
parent e5f554ac48
commit cf5014771d
4 changed files with 10 additions and 3 deletions
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3
clang/include/clang/Basic/TargetInfo.h
View File

@ -256,6 +256,9 @@ public:
return *LongDoubleFormat;
}
/// getFloatEvalMethod - Return the value for the C99 FLT_EVAL_METHOD macro.
virtual unsigned getFloatEvalMethod() const { return 0; }
// getLargeArrayMinWidth/Align - Return the minimum array size that is
// 'large' and its alignment.
unsigned getLargeArrayMinWidth() const { return LargeArrayMinWidth; }

4
clang/lib/Basic/Targets.cpp
View File

@ -1339,6 +1339,10 @@ public:
BigEndian = false;
LongDoubleFormat = &llvm::APFloat::x87DoubleExtended;
}
virtual unsigned getFloatEvalMethod() const {
// X87 evaluates with 80 bits "long double" precision.
return SSELevel == NoSSE ? 2 : 0;
}
virtual void getTargetBuiltins(const Builtin::Info *&Records,
unsigned &NumRecords) const {
Records = BuiltinInfo;

2
clang/lib/Frontend/InitPreprocessor.cpp
View File

@ -513,7 +513,7 @@ static void InitializePredefinedMacros(const TargetInfo &TI,
}
// Macros to control C99 numerics and <float.h>
Builder.defineMacro("__FLT_EVAL_METHOD__", "0");
Builder.defineMacro("__FLT_EVAL_METHOD__", Twine(TI.getFloatEvalMethod()));
Builder.defineMacro("__FLT_RADIX__", "2");
int Dig = PickFP(&TI.getLongDoubleFormat(), -1/*FIXME*/, 17, 21, 33, 36);
Builder.defineMacro("__DECIMAL_DIG__", Twine(Dig));

4
clang/test/Preprocessor/init.c
View File

@ -242,7 +242,7 @@
// I386:#define __FLT_DENORM_MIN__ 1.40129846e-45F
// I386:#define __FLT_DIG__ 6
// I386:#define __FLT_EPSILON__ 1.19209290e-7F
// I386:#define __FLT_EVAL_METHOD__ 0
// I386:#define __FLT_EVAL_METHOD__ 2
// I386:#define __FLT_HAS_DENORM__ 1
// I386:#define __FLT_HAS_INFINITY__ 1
// I386:#define __FLT_HAS_QUIET_NAN__ 1
@ -315,7 +315,7 @@
// I386:#define __i386__ 1
// I386:#define i386 1
//
// RUN: %clang_cc1 -E -dM -ffreestanding -triple=i386-pc-linux-gnu < /dev/null | FileCheck -check-prefix I386-LINUX %s
// RUN: %clang_cc1 -E -dM -ffreestanding -triple=i386-pc-linux-gnu -target-cpu pentium4 < /dev/null | FileCheck -check-prefix I386-LINUX %s
//
// I386-LINUX:#define __CHAR16_TYPE__ unsigned short
// I386-LINUX:#define __CHAR32_TYPE__ unsigned int