Revert "Constant Fold Logf128 calls (#84501)"

This reverts commit e90bc9c.

Author: MDevereau

llvm/CMakeLists.txt

@@ -562,8 +562,6 @@ set(LLVM_USE_STATIC_ZSTD FALSE CACHE BOOL "Use static version of zstd. Can be TR
 
 set(LLVM_ENABLE_CURL "OFF" CACHE STRING "Use libcurl for the HTTP client if available. Can be ON, OFF, or FORCE_ON")
 
-set(LLVM_HAS_LOGF128 "OFF" CACHE STRING "Use logf128 to constant fold fp128 logarithm calls. Can be ON, OFF, or FORCE_ON")
-
 set(LLVM_ENABLE_HTTPLIB "OFF" CACHE STRING "Use cpp-httplib HTTP server library if available. Can be ON, OFF, or FORCE_ON")
 
 set(LLVM_Z3_INSTALL_DIR "" CACHE STRING "Install directory of the Z3 solver.")

llvm/cmake/config-ix.cmake

@@ -257,17 +257,6 @@ else()
   set(LLVM_ENABLE_TERMINFO 0)
 endif()
 
-if(LLVM_HAS_LOGF128)
-  include(CheckCXXSymbolExists)
-  check_cxx_symbol_exists(logf128 math.h HAS_LOGF128)
-
-  if(LLVM_HAS_LOGF128 STREQUAL FORCE_ON AND NOT HAS_LOGF128)
-    message(FATAL_ERROR "Failed to configure logf128")
-  endif()
-
-  set(LLVM_HAS_LOGF128 "${HAS_LOGF128}")
-endif()
-
 # function checks
 check_symbol_exists(arc4random "stdlib.h" HAVE_DECL_ARC4RANDOM)
 find_package(Backtrace)

llvm/include/llvm/ADT/APFloat.h

@@ -19,7 +19,6 @@
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/FloatingPointMode.h"
 #include "llvm/Support/ErrorHandling.h"
-#include "llvm/Support/float128.h"
 #include <memory>
 
 #define APFLOAT_DISPATCH_ON_SEMANTICS(METHOD_CALL)                             \
@@ -355,9 +354,6 @@ class IEEEFloat final : public APFloatBase {
   Expected<opStatus> convertFromString(StringRef, roundingMode);
   APInt bitcastToAPInt() const;
   double convertToDouble() const;
-#ifdef __FLOAT128__
-  float128 convertToQuad() const;
-#endif
   float convertToFloat() const;
 
   /// @}
@@ -1222,15 +1218,6 @@ class APFloat : public APFloatBase {
   /// shorter semantics, like IEEEsingle and others.
   double convertToDouble() const;
 
-  /// Converts this APFloat to host float value.
-  ///
-  /// \pre The APFloat must be built using semantics, that can be represented by
-  /// the host float type without loss of precision. It can be IEEEquad and
-  /// shorter semantics, like IEEEdouble and others.
-#ifdef __FLOAT128__
-  float128 convertToQuad() const;
-#endif
-
   /// Converts this APFloat to host float value.
   ///
   /// \pre The APFloat must be built using semantics, that can be represented by

llvm/include/llvm/ADT/APInt.h

@@ -17,7 +17,6 @@
 
 #include "llvm/Support/Compiler.h"
 #include "llvm/Support/MathExtras.h"
-#include "llvm/Support/float128.h"
 #include <cassert>
 #include <climits>
 #include <cstring>
@@ -1671,13 +1670,6 @@ class [[nodiscard]] APInt {
   /// any bit width. Exactly 64 bits will be translated.
   double bitsToDouble() const { return llvm::bit_cast<double>(getWord(0)); }
 
-#ifdef __FLOAT128__
-  float128 bitsToQuad() const {
-    __uint128_t ul = ((__uint128_t)U.pVal[1] << 64) + U.pVal[0];
-    return llvm::bit_cast<float128>(ul);
-  }
-#endif
-
   /// Converts APInt bits to a float
   ///
   /// The conversion does not do a translation from integer to float, it just

llvm/include/llvm/Config/llvm-config.h.cmake

@@ -198,7 +198,4 @@
 /* Define if plugins enabled */
 #cmakedefine LLVM_ENABLE_PLUGINS
 
-/* Define if logf128 is available */
-#cmakedefine LLVM_HAS_LOGF128
-
 #endif

llvm/include/llvm/Support/float128.h

@@ -159,9 +159,3 @@ add_llvm_component_library(LLVMAnalysis
   Support
   TargetParser
   )
-
-include(CheckCXXSymbolExists)
-check_cxx_symbol_exists(logf128 math.h HAS_LOGF128)
-if(HAS_LOGF128)
- target_compile_definitions(LLVMAnalysis PRIVATE HAS_LOGF128)
-endif()

llvm/lib/Analysis/CMakeLists.txt

@@ -2089,17 +2089,6 @@ static Constant *ConstantFoldScalarCall1(StringRef Name,
     if (IntrinsicID == Intrinsic::canonicalize)
       return constantFoldCanonicalize(Ty, Call, U);
 
-#if defined(__FLOAT128__) && defined(HAS_LOGF128)
-    if (Ty->isFP128Ty()) {
-      switch (IntrinsicID) {
-      default:
-        return nullptr;
-      case Intrinsic::log:
-        return ConstantFP::get(Ty, logf128(Op->getValueAPF().convertToQuad()));
-      }
-    }
-#endif
-
     if (!Ty->isHalfTy() && !Ty->isFloatTy() && !Ty->isDoubleTy())
       return nullptr;
 

llvm/lib/Analysis/ConstantFolding.cpp

@@ -3670,15 +3670,6 @@ double IEEEFloat::convertToDouble() const {
   return api.bitsToDouble();
 }
 
-#ifdef __FLOAT128__
-float128 IEEEFloat::convertToQuad() const {
-  assert(semantics == (const llvm::fltSemantics *)&semIEEEquad &&
-         "Float semantics are not IEEEquads");
-  APInt api = bitcastToAPInt();
-  return api.bitsToQuad();
-}
-#endif
-
 /// Integer bit is explicit in this format.  Intel hardware (387 and later)
 /// does not support these bit patterns:
 ///  exponent = all 1's, integer bit 0, significand 0 ("pseudoinfinity")
@@ -5274,21 +5265,6 @@ double APFloat::convertToDouble() const {
   return Temp.getIEEE().convertToDouble();
 }
 
-#ifdef __FLOAT128__
-float128 APFloat::convertToQuad() const {
-  if (&getSemantics() == (const llvm::fltSemantics *)&semIEEEquad)
-    return getIEEE().convertToQuad();
-  assert(getSemantics().isRepresentableBy(semIEEEquad) &&
-         "Float semantics is not representable by IEEEquad");
-  APFloat Temp = *this;
-  bool LosesInfo;
-  opStatus St = Temp.convert(semIEEEquad, rmNearestTiesToEven, &LosesInfo);
-  assert(!(St & opInexact) && !LosesInfo && "Unexpected imprecision");
-  (void)St;
-  return Temp.getIEEE().convertToQuad();
-}
-#endif
-
 float APFloat::convertToFloat() const {
   if (&getSemantics() == (const llvm::fltSemantics *)&semIEEEsingle)
     return getIEEE().convertToFloat();

llvm/lib/Support/APFloat.cpp

@@ -25,7 +25,6 @@ llvm_canonicalize_cmake_booleans(
   LLVM_INCLUDE_DXIL_TESTS
   LLVM_TOOL_LLVM_DRIVER_BUILD
   LLVM_INCLUDE_SPIRV_TOOLS_TESTS
-  LLVM_HAS_LOGF128
   )
 
 configure_lit_site_cfg(

llvm/test/CMakeLists.txt

@@ -614,6 +614,3 @@ def have_ld64_plugin_support():
 # "OBJECT_MODE" to 'any' by default on AIX OS.
 if "system-aix" in config.available_features:
     config.environment["OBJECT_MODE"] = "any"
-
-if config.has_logf128:
-    config.available_features.add("has_logf128")

llvm/test/Transforms/InstSimplify/ConstProp/logf128.ll

@@ -61,7 +61,6 @@ config.reverse_iteration = @LLVM_ENABLE_REVERSE_ITERATION@
 config.dxil_tests = @LLVM_INCLUDE_DXIL_TESTS@
 config.have_llvm_driver = @LLVM_TOOL_LLVM_DRIVER_BUILD@
 config.spirv_tools_tests = @LLVM_INCLUDE_SPIRV_TOOLS_TESTS@
-config.has_logf128 = @LLVM_HAS_LOGF128@
 
 import lit.llvm
 lit.llvm.initialize(lit_config, config)

llvm/test/lit.cfg.py

@@ -80,11 +80,5 @@ if(NOT WIN32)
   export_executable_symbols_for_plugins(AnalysisTests)
 endif()
 
-include(CheckCXXSymbolExists)
-check_cxx_symbol_exists(logf128 math.h HAS_LOGF128)
-if(HAS_LOGF128)
-  target_compile_definitions(AnalysisTests PRIVATE HAS_LOGF128)
-endif()
-
 add_subdirectory(InlineAdvisorPlugin)
 add_subdirectory(InlineOrderPlugin)