[PowerPC] Scalar IBM MASS library conversion pass

This patch introduces the conversions from math function calls
to MASS library calls. To resolves calls generated with these conversions, one
need to link libxlopt.a library. This patch is tested on PowerPC Linux and AIX.

Differential: https://reviews.llvm.org/D101759

Reviewer: bmahjour

1 files changed, 9 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/CommandFlags.cpp b/llvm/lib/CodeGen/CommandFlags.cpp
index 1d50e1d..cb77407 100644
--- a/llvm/lib/CodeGen/CommandFlags.cpp
+++ b/llvm/lib/CodeGen/CommandFlags.cpp
@@ -58,6 +58,7 @@ CGOPT(bool, EnableUnsafeFPMath)
 CGOPT(bool, EnableNoInfsFPMath)
 CGOPT(bool, EnableNoNaNsFPMath)
 CGOPT(bool, EnableNoSignedZerosFPMath)
+CGOPT(bool, EnableApproxFuncFPMath)
 CGOPT(bool, EnableNoTrappingFPMath)
 CGOPT(bool, EnableAIXExtendedAltivecABI)
 CGOPT(DenormalMode::DenormalModeKind, DenormalFPMath)
@@ -218,6 +219,12 @@ codegen::RegisterCodeGenFlags::RegisterCodeGenFlags() {
       cl::init(false));
   CGBINDOPT(EnableNoSignedZerosFPMath);
 
+  static cl::opt<bool> EnableApproxFuncFPMath(
+      "enable-approx-func-fp-math",
+      cl::desc("Enable FP math optimizations that assume approx func"),
+      cl::init(false));
+  CGBINDOPT(EnableApproxFuncFPMath);
+
   static cl::opt<bool> EnableNoTrappingFPMath(
       "enable-no-trapping-fp-math",
       cl::desc("Enable setting the FP exceptions build "
@@ -493,6 +500,7 @@ codegen::InitTargetOptionsFromCodeGenFlags(const Triple &TheTriple) {
   Options.NoInfsFPMath = getEnableNoInfsFPMath();
   Options.NoNaNsFPMath = getEnableNoNaNsFPMath();
   Options.NoSignedZerosFPMath = getEnableNoSignedZerosFPMath();
+  Options.ApproxFuncFPMath = getEnableApproxFuncFPMath();
   Options.NoTrappingFPMath = getEnableNoTrappingFPMath();
 
   DenormalMode::DenormalModeKind DenormKind = getDenormalFPMath();
@@ -643,6 +651,7 @@ void codegen::setFunctionAttributes(StringRef CPU, StringRef Features,
   HANDLE_BOOL_ATTR(EnableNoInfsFPMathView, "no-infs-fp-math");
   HANDLE_BOOL_ATTR(EnableNoNaNsFPMathView, "no-nans-fp-math");
   HANDLE_BOOL_ATTR(EnableNoSignedZerosFPMathView, "no-signed-zeros-fp-math");
+  HANDLE_BOOL_ATTR(EnableApproxFuncFPMathView, "approx-func-fp-math");
 
   if (DenormalFPMathView->getNumOccurrences() > 0 &&
       !F.hasFnAttribute("denormal-fp-math")) {