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Siva Chandra Reddy
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[libc] Add implementations of the remaining fenv functions.
Namely, implementations of fegetexceptfflag, fesetexceptflag, fegetenv, fesetenv, feholdexcept and feupdateenv have been added. Reviewed By: lntue Differential Revision: https://reviews.llvm.org/D96935
1 parent 53e83af commit b7e05c8

25 files changed

+707
-19
lines changed

‎libc/config/linux/aarch64/entrypoints.txt

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@@ -22,10 +22,16 @@ set(TARGET_LIBC_ENTRYPOINTS
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# fenv.h entrypoints
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libc.src.fenv.feclearexcept
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libc.src.fenv.fegetenv
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libc.src.fenv.fegetexceptflag
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libc.src.fenv.fegetround
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libc.src.fenv.feholdexcept
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libc.src.fenv.fesetenv
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libc.src.fenv.fesetexceptflag
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libc.src.fenv.fesetround
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libc.src.fenv.feraiseexcept
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libc.src.fenv.fetestexcept
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libc.src.fenv.feupdateenv
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# stdlib.h entrypoints
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libc.src.stdlib.abs

‎libc/config/linux/api.td

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@@ -179,6 +179,29 @@ def MathAPI : PublicAPI<"math.h"> {
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];
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}
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def FEnvT : TypeDecl<"fenv_t"> {
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let Decl = [{
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#ifdef __aarch64__
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typedef struct {
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unsigned char __control_word[4];
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unsigned char __status_word[4];
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} fenv_t;
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#endif
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#ifdef __x86_64__
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typedef struct {
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unsigned char __x86_status[28];
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unsigned char __mxcsr[4];
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} fenv_t;
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#endif
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}];
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}
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def FExceptT : TypeDecl<"fexcept_t"> {
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let Decl = [{
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typedef int fexcept_t;
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}];
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}
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def FenvAPI: PublicAPI<"fenv.h"> {
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let Macros = [
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SimpleMacroDef<"FE_DIVBYZERO", "1">,
@@ -193,6 +216,10 @@ def FenvAPI: PublicAPI<"fenv.h"> {
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SimpleMacroDef<"FE_TOWARDZERO", "4">,
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SimpleMacroDef<"FE_UPWARD", "8">,
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];
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let TypeDeclarations = [
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FEnvT,
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FExceptT,
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];
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}
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def StringAPI : PublicAPI<"string.h"> {

‎libc/config/linux/x86_64/entrypoints.txt

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@@ -25,10 +25,16 @@ set(TARGET_LIBC_ENTRYPOINTS
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# fenv.h entrypoints
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libc.src.fenv.feclearexcept
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libc.src.fenv.fegetenv
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libc.src.fenv.fegetexceptflag
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libc.src.fenv.fegetround
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libc.src.fenv.feholdexcept
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libc.src.fenv.fesetenv
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libc.src.fenv.fesetexceptflag
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libc.src.fenv.fesetround
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libc.src.fenv.feraiseexcept
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libc.src.fenv.fetestexcept
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libc.src.fenv.feupdateenv
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# signal.h entrypoints
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libc.src.signal.raise

‎libc/spec/stdc.td

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@@ -96,6 +96,12 @@ def StdC : StandardSpec<"stdc"> {
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]
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>;
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NamedType FEnvT = NamedType<"fenv_t">;
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PtrType FEnvTPtr = PtrType<FEnvT>;
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ConstType ConstFEnvTPtr = ConstType<FEnvTPtr>;
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NamedType FExceptT = NamedType<"fexcept_t">;
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PtrType FExceptTPtr = PtrType<FExceptT>;
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ConstType ConstFExceptTPtr = ConstType<FExceptTPtr>;
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HeaderSpec Fenv = HeaderSpec<
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"fenv.h",
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[
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Macro<"FE_TOWARDZERO">,
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Macro<"FE_UPWARD">
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],
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[], // Types
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[
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NamedType<"fenv_t">,
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NamedType<"fexcept_t">,
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], // Types
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[], // Enumerations
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[
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FunctionSpec<
@@ -139,6 +148,36 @@ def StdC : StandardSpec<"stdc"> {
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RetValSpec<IntType>,
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[]
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>,
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FunctionSpec<
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"fegetenv",
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RetValSpec<IntType>,
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[ArgSpec<FEnvTPtr>]
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>,
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FunctionSpec<
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"fesetenv",
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RetValSpec<IntType>,
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[ArgSpec<ConstFEnvTPtr>]
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>,
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FunctionSpec<
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"fegetexceptflag",
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RetValSpec<IntType>,
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[ArgSpec<FExceptTPtr>, ArgSpec<IntType>]
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>,
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FunctionSpec<
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"fesetexceptflag",
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RetValSpec<IntType>,
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[ArgSpec<ConstFExceptTPtr>, ArgSpec<IntType>]
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>,
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FunctionSpec<
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"feholdexcept",
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RetValSpec<IntType>,
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[ArgSpec<FEnvTPtr>]
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>,
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FunctionSpec<
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"feupdateenv",
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RetValSpec<IntType>,
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[ArgSpec<ConstFEnvTPtr>]
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>,
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]
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>;
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‎libc/src/fenv/CMakeLists.txt

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@@ -62,3 +62,81 @@ add_entrypoint_object(
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COMPILE_OPTIONS
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-O2
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)
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add_entrypoint_object(
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fegetenv
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SRCS
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fegetenv.cpp
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HDRS
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fegetenv.h
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DEPENDS
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libc.include.fenv
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libc.utils.FPUtil.fputil
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COMPILE_OPTIONS
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-O2
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)
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add_entrypoint_object(
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fesetenv
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SRCS
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fesetenv.cpp
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HDRS
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fesetenv.h
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DEPENDS
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libc.include.fenv
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libc.utils.FPUtil.fputil
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COMPILE_OPTIONS
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-O2
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)
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add_entrypoint_object(
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fegetexceptflag
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SRCS
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fegetexceptflag.cpp
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HDRS
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fegetexceptflag.h
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DEPENDS
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libc.include.fenv
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libc.utils.FPUtil.fputil
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COMPILE_OPTIONS
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-O2
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)
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add_entrypoint_object(
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fesetexceptflag
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SRCS
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fesetexceptflag.cpp
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HDRS
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fesetexceptflag.h
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DEPENDS
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libc.include.fenv
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libc.utils.FPUtil.fputil
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COMPILE_OPTIONS
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-O2
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)
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add_entrypoint_object(
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feholdexcept
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SRCS
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feholdexcept.cpp
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HDRS
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feholdexcept.h
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DEPENDS
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libc.include.fenv
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libc.utils.FPUtil.fputil
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COMPILE_OPTIONS
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-O2
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)
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add_entrypoint_object(
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feupdateenv
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SRCS
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feupdateenv.cpp
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HDRS
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feupdateenv.h
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DEPENDS
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libc.include.fenv
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libc.utils.FPUtil.fputil
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COMPILE_OPTIONS
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-O2
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)

‎libc/src/fenv/fegetenv.cpp

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@@ -0,0 +1,19 @@
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//===-- Implementation of fegetenv function -----------------------------===//
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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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#include "src/fenv/fegetenv.h"
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#include "src/__support/common.h"
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#include "utils/FPUtil/FEnv.h"
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namespace __llvm_libc {
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LLVM_LIBC_FUNCTION(int, fegetenv, (fenv_t * envp)) {
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return fputil::getEnv(envp);
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}
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} // namespace __llvm_libc

‎libc/src/fenv/fegetenv.h

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//===-- Implementation header for fegetenv ----------------------*- 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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#ifndef LLVM_LIBC_SRC_FENV_FEGETENV_H
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#define LLVM_LIBC_SRC_FENV_FEGETENV_H
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#include <fenv.h>
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namespace __llvm_libc {
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int fegetenv(fenv_t *);
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} // namespace __llvm_libc
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#endif // LLVM_LIBC_SRC_FENV_FEGETENV_H

‎libc/src/fenv/fegetexceptflag.cpp

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@@ -0,0 +1,26 @@
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//===-- Implementation of fegetexceptflag function ------------------------===//
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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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#include "src/fenv/fegetexceptflag.h"
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#include "src/__support/common.h"
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#include "utils/FPUtil/FEnv.h"
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#include <fenv.h>
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namespace __llvm_libc {
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LLVM_LIBC_FUNCTION(int, fegetexceptflag, (fexcept_t * flagp, int excepts)) {
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// Since the return type of fetestexcept is int, we ensure that fexcept_t
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// matches in size.
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static_assert(sizeof(int) == sizeof(fexcept_t),
21+
"sizeof(fexcept_t) != sizeof(int)");
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*reinterpret_cast<int *>(flagp) = fputil::testExcept(FE_ALL_EXCEPT) & excepts;
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return 0;
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}
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} // namespace __llvm_libc

‎libc/src/fenv/fegetexceptflag.h

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//===-- Implementation header for fegetexceptflag ---------------*- 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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#ifndef LLVM_LIBC_SRC_FENV_FEGETEXCEPTFLAG_H
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#define LLVM_LIBC_SRC_FENV_FEGETEXCEPTFLAG_H
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#include <fenv.h>
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namespace __llvm_libc {
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int fegetexceptflag(fexcept_t *, int excepts);
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} // namespace __llvm_libc
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#endif // LLVM_LIBC_SRC_FENV_FEGETEXCEPTFLAG_H

‎libc/src/fenv/feholdexcept.cpp

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//===-- Implementation of feholdexcept function ---------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4+
// 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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9+
#include "src/fenv/feholdexcept.h"
10+
#include "src/__support/common.h"
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#include "utils/FPUtil/FEnv.h"
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13+
#include <fenv.h>
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namespace __llvm_libc {
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17+
LLVM_LIBC_FUNCTION(int, feholdexcept, (fenv_t * envp)) {
18+
if (fputil::getEnv(envp) != 0)
19+
return -1;
20+
fputil::clearExcept(FE_ALL_EXCEPT);
21+
fputil::disableExcept(FE_ALL_EXCEPT);
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return 0;
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}
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25+
} // namespace __llvm_libc

‎libc/src/fenv/feholdexcept.h

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//===-- Implementation header for feholdexcept ------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4+
// 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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#ifndef LLVM_LIBC_SRC_FENV_FEHOLDEXCEPT_H
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#define LLVM_LIBC_SRC_FENV_FEHOLDEXCEPT_H
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#include <fenv.h>
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namespace __llvm_libc {
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int feholdexcept(fenv_t *);
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} // namespace __llvm_libc
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#endif // LLVM_LIBC_SRC_FENV_FEHOLDEXCEPT_H

‎libc/src/fenv/fesetenv.cpp

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//===-- Implementation of fesetenv function -----------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4+
// See https://llvm.org/LICENSE.txt for license information.
5+
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6+
//
7+
//===----------------------------------------------------------------------===//
8+
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#include "src/fenv/fesetenv.h"
10+
#include "src/__support/common.h"
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#include "utils/FPUtil/FEnv.h"
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namespace __llvm_libc {
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15+
LLVM_LIBC_FUNCTION(int, fesetenv, (const fenv_t *envp)) {
16+
return fputil::setEnv(envp);
17+
}
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} // namespace __llvm_libc

‎libc/src/fenv/fesetenv.h

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//===-- Implementation header for fesetenv ----------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4+
// See https://llvm.org/LICENSE.txt for license information.
5+
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6+
//
7+
//===----------------------------------------------------------------------===//
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9+
#ifndef LLVM_LIBC_SRC_FENV_FESETENV_H
10+
#define LLVM_LIBC_SRC_FENV_FESETENV_H
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12+
#include <fenv.h>
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namespace __llvm_libc {
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16+
int fesetenv(const fenv_t *);
17+
18+
} // namespace __llvm_libc
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#endif // LLVM_LIBC_SRC_FENV_FESETENV_H

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