instcombine: Migrate toascii optimizations

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

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168580 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/Scalar/SimplifyLibCalls.cpp

@@ -95,27 +95,6 @@ static bool CallHasFloatingPointArgument(const CallInst *CI) {
 }
 
 namespace {
-//===----------------------------------------------------------------------===//
-// Integer Optimizations
-//===----------------------------------------------------------------------===//
-
-//===---------------------------------------===//
-// 'toascii' Optimizations
-
-struct ToAsciiOpt : public LibCallOptimization {
-  virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
-    FunctionType *FT = Callee->getFunctionType();
-    // We require i32(i32)
-    if (FT->getNumParams() != 1 || FT->getReturnType() != FT->getParamType(0) ||
-        !FT->getParamType(0)->isIntegerTy(32))
-      return 0;
-
-    // isascii(c) -> c & 0x7f
-    return B.CreateAnd(CI->getArgOperand(0),
-                       ConstantInt::get(CI->getType(),0x7F));
-  }
-};
-
 //===----------------------------------------------------------------------===//
 // Formatting and IO Optimizations
 //===----------------------------------------------------------------------===//
@@ -483,8 +462,6 @@ namespace {
     TargetLibraryInfo *TLI;
 
     StringMap<LibCallOptimization*> Optimizations;
-    // Integer Optimizations
-    ToAsciiOpt ToAscii;
     // Formatting and IO Optimizations
     SPrintFOpt SPrintF; PrintFOpt PrintF;
     FWriteOpt FWrite; FPutsOpt FPuts; FPrintFOpt FPrintF;
@@ -543,9 +520,6 @@ void SimplifyLibCalls::AddOpt(LibFunc::Func F1, LibFunc::Func F2,
 /// Optimizations - Populate the Optimizations map with all the optimizations
 /// we know.
 void SimplifyLibCalls::InitOptimizations() {
-  // Integer Optimizations
-  Optimizations["toascii"] = &ToAscii;
-
   // Formatting and IO Optimizations
   Optimizations["sprintf"] = &SPrintF;
   Optimizations["printf"] = &PrintF;

lib/Transforms/Utils/SimplifyLibCalls.cpp

@@ -1298,6 +1298,20 @@ struct IsAsciiOpt : public LibCallOptimization {
   }
 };
 
+struct ToAsciiOpt : public LibCallOptimization {
+  virtual Value *callOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
+    FunctionType *FT = Callee->getFunctionType();
+    // We require i32(i32)
+    if (FT->getNumParams() != 1 || FT->getReturnType() != FT->getParamType(0) ||
+        !FT->getParamType(0)->isIntegerTy(32))
+      return 0;
+
+    // isascii(c) -> c & 0x7f
+    return B.CreateAnd(CI->getArgOperand(0),
+                       ConstantInt::get(CI->getType(),0x7F));
+  }
+};
+
 } // End anonymous namespace.
 
 namespace llvm {
@@ -1349,6 +1363,7 @@ class LibCallSimplifierImpl {
   AbsOpt Abs;
   IsDigitOpt IsDigit;
   IsAsciiOpt IsAscii;
+  ToAsciiOpt ToAscii;
 
   void initOptimizations();
   void addOpt(LibFunc::Func F, LibCallOptimization* Opt);
@@ -1469,6 +1484,7 @@ void LibCallSimplifierImpl::initOptimizations() {
   addOpt(LibFunc::llabs, &Abs);
   addOpt(LibFunc::isdigit, &IsDigit);
   addOpt(LibFunc::isascii, &IsAscii);
+  addOpt(LibFunc::toascii, &ToAscii);
 }
 
 Value *LibCallSimplifierImpl::optimizeCall(CallInst *CI) {

test/Transforms/InstCombine/toascii-1.ll

@@ -0,0 +1,59 @@
+; Test that the toascii library call simplifier works correctly.
+;
+; RUN: opt < %s -instcombine -S | FileCheck %s
+
+target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
+
+declare i32 @toascii(i32)
+
+; Check isascii(c) -> c & 0x7f.
+
+define i32 @test_simplify1() {
+; CHECK: @test_simplify1
+  %ret = call i32 @toascii(i32 0)
+  ret i32 %ret
+; CHECK-NEXT: ret i32 0
+}
+
+define i32 @test_simplify2() {
+; CHECK: @test_simplify2
+  %ret = call i32 @toascii(i32 1)
+  ret i32 %ret
+; CHECK-NEXT: ret i32 1
+}
+
+define i32 @test_simplify3() {
+; CHECK: @test_simplify3
+  %ret = call i32 @toascii(i32 127)
+  ret i32 %ret
+; CHECK-NEXT: ret i32 127
+}
+
+define i32 @test_simplify4() {
+; CHECK: @test_simplify4
+  %ret = call i32 @toascii(i32 128)
+  ret i32 %ret
+; CHECK-NEXT: ret i32 0
+}
+
+define i32 @test_simplify5() {
+; CHECK: @test_simplify5
+  %ret = call i32 @toascii(i32 255)
+  ret i32 %ret
+; CHECK-NEXT: ret i32 127
+}
+
+define i32 @test_simplify6() {
+; CHECK: @test_simplify6
+  %ret = call i32 @toascii(i32 256)
+  ret i32 %ret
+; CHECK-NEXT: ret i32 0
+}
+
+define i32 @test_simplify7(i32 %x) {
+; CHECK: @test_simplify7
+  %ret = call i32 @toascii(i32 %x)
+; CHECK-NEXT: [[AND:%[a-z0-9]+]] = and i32 %x, 127
+  ret i32 %ret
+; CHECK-NEXT: ret i32 [[AND]]
+}

test/Transforms/SimplifyLibCalls/ToAscii.ll

@@ -1,21 +0,0 @@
-; Test that the ToAsciiOptimizer works correctly
-; RUN: opt < %s -simplify-libcalls -S | \
-; RUN:   not grep "call.*toascii"
-
-declare i32 @toascii(i32)
-
-define i32 @main() {
-	%val1 = call i32 @toascii( i32 1 )		; <i32> [#uses=1]
-	%val2 = call i32 @toascii( i32 0 )		; <i32> [#uses=1]
-	%val3 = call i32 @toascii( i32 127 )		; <i32> [#uses=1]
-	%val4 = call i32 @toascii( i32 128 )		; <i32> [#uses=1]
-	%val5 = call i32 @toascii( i32 255 )		; <i32> [#uses=1]
-	%val6 = call i32 @toascii( i32 256 )		; <i32> [#uses=1]
-	%rslt1 = add i32 %val1, %val2		; <i32> [#uses=1]
-	%rslt2 = add i32 %val3, %val4		; <i32> [#uses=1]
-	%rslt3 = add i32 %val5, %val6		; <i32> [#uses=1]
-	%rslt4 = add i32 %rslt1, %rslt2		; <i32> [#uses=1]
-	%rslt5 = add i32 %rslt4, %rslt3		; <i32> [#uses=1]
-	ret i32 %rslt5
-}
-