From a0798ec3774de21f3ae3a7eba237e274e4c05ac3 Mon Sep 17 00:00:00 2001
From: Meador Inge <meadori@codesourcery.com>
Date: Mon, 26 Nov 2012 02:31:59 +0000
Subject: instcombine: Migrate isdigit optimizations

This patch migrates the isdigit optimizations from the simplify-libcalls
pass into the instcombine library call simplifier.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168578 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Transforms/Scalar/SimplifyLibCalls.cpp | 22 +---------------------
 1 file changed, 1 insertion(+), 21 deletions(-)

(limited to 'lib/Transforms/Scalar/SimplifyLibCalls.cpp')

diff --git a/lib/Transforms/Scalar/SimplifyLibCalls.cpp b/lib/Transforms/Scalar/SimplifyLibCalls.cpp
index fecc389307..8ae00d8b3a 100644
--- a/lib/Transforms/Scalar/SimplifyLibCalls.cpp
+++ b/lib/Transforms/Scalar/SimplifyLibCalls.cpp
@@ -99,25 +99,6 @@ namespace {
 // Integer Optimizations
 //===----------------------------------------------------------------------===//
 
-//===---------------------------------------===//
-// 'isdigit' Optimizations
-
-struct IsDigitOpt : public LibCallOptimization {
-  virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
-    FunctionType *FT = Callee->getFunctionType();
-    // We require integer(i32)
-    if (FT->getNumParams() != 1 || !FT->getReturnType()->isIntegerTy() ||
-        !FT->getParamType(0)->isIntegerTy(32))
-      return 0;
-
-    // isdigit(c) -> (c-'0') <u 10
-    Value *Op = CI->getArgOperand(0);
-    Op = B.CreateSub(Op, B.getInt32('0'), "isdigittmp");
-    Op = B.CreateICmpULT(Op, B.getInt32(10), "isdigit");
-    return B.CreateZExt(Op, CI->getType());
-  }
-};
-
 //===---------------------------------------===//
 // 'isascii' Optimizations
 
@@ -521,7 +502,7 @@ namespace {
 
     StringMap<LibCallOptimization*> Optimizations;
     // Integer Optimizations
-    IsDigitOpt IsDigit; IsAsciiOpt IsAscii;
+    IsAsciiOpt IsAscii;
     ToAsciiOpt ToAscii;
     // Formatting and IO Optimizations
     SPrintFOpt SPrintF; PrintFOpt PrintF;
@@ -582,7 +563,6 @@ void SimplifyLibCalls::AddOpt(LibFunc::Func F1, LibFunc::Func F2,
 /// we know.
 void SimplifyLibCalls::InitOptimizations() {
   // Integer Optimizations
-  Optimizations["isdigit"] = &IsDigit;
   Optimizations["isascii"] = &IsAscii;
   Optimizations["toascii"] = &ToAscii;
 
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