instcombine: Migrate strto* optimizations

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

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167119 91177308-0d34-0410-b5e6-96231b3b80d8

4 files changed, 111 insertions, 45 deletions

diff --git a/lib/Transforms/Scalar/SimplifyLibCalls.cpp b/lib/Transforms/Scalar/SimplifyLibCalls.cpp
index 7002eb4119..32fcdbfe90 100644
--- a/lib/Transforms/Scalar/SimplifyLibCalls.cpp
+++ b/lib/Transforms/Scalar/SimplifyLibCalls.cpp
@@ -119,29 +119,6 @@ static bool IsOnlyUsedInEqualityComparison(Value *V, Value *With) {
 
 namespace {
 //===---------------------------------------===//
-// 'strto*' Optimizations.  This handles strtol, strtod, strtof, strtoul, etc.
-
-struct StrToOpt : public LibCallOptimization {
-  virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
-    FunctionType *FT = Callee->getFunctionType();
-    if ((FT->getNumParams() != 2 && FT->getNumParams() != 3) ||
-        !FT->getParamType(0)->isPointerTy() ||
-        !FT->getParamType(1)->isPointerTy())
-      return 0;
-
-    Value *EndPtr = CI->getArgOperand(1);
-    if (isa<ConstantPointerNull>(EndPtr)) {
-      // With a null EndPtr, this function won't capture the main argument.
-      // It would be readonly too, except that it still may write to errno.
-      CI->addAttribute(1, Attributes::get(Callee->getContext(),
-                                          Attributes::NoCapture));
-    }
-
-    return 0;
-  }
-};
-
-//===---------------------------------------===//
 // 'strspn' Optimizations
 
 struct StrSpnOpt : public LibCallOptimization {
@@ -1066,7 +1043,7 @@ namespace {
 
     StringMap<LibCallOptimization*> Optimizations;
     // String and Memory LibCall Optimizations
-    StrToOpt StrTo; StrSpnOpt StrSpn; StrCSpnOpt StrCSpn; StrStrOpt StrStr;
+    StrSpnOpt StrSpn; StrCSpnOpt StrCSpn; StrStrOpt StrStr;
     MemCmpOpt MemCmp; MemCpyOpt MemCpy; MemMoveOpt MemMove; MemSetOpt MemSet;
     // Math Library Optimizations
     CosOpt Cos; PowOpt Pow; Exp2Opt Exp2;
@@ -1134,13 +1111,6 @@ void SimplifyLibCalls::AddOpt(LibFunc::Func F1, LibFunc::Func F2,
 /// we know.
 void SimplifyLibCalls::InitOptimizations() {
   // String and Memory LibCall Optimizations
-  Optimizations["strtol"] = &StrTo;
-  Optimizations["strtod"] = &StrTo;
-  Optimizations["strtof"] = &StrTo;
-  Optimizations["strtoul"] = &StrTo;
-  Optimizations["strtoll"] = &StrTo;
-  Optimizations["strtold"] = &StrTo;
-  Optimizations["strtoull"] = &StrTo;
   Optimizations["strspn"] = &StrSpn;
   Optimizations["strcspn"] = &StrCSpn;
   Optimizations["strstr"] = &StrStr;
diff --git a/lib/Transforms/Utils/SimplifyLibCalls.cpp b/lib/Transforms/Utils/SimplifyLibCalls.cpp
index 1aac8c5745..04e36c4b41 100644
--- a/lib/Transforms/Utils/SimplifyLibCalls.cpp
+++ b/lib/Transforms/Utils/SimplifyLibCalls.cpp
@@ -752,6 +752,26 @@ struct StrPBrkOpt : public LibCallOptimization {
   }
 };
 
+struct StrToOpt : public LibCallOptimization {
+  virtual Value *callOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
+    FunctionType *FT = Callee->getFunctionType();
+    if ((FT->getNumParams() != 2 && FT->getNumParams() != 3) ||
+        !FT->getParamType(0)->isPointerTy() ||
+        !FT->getParamType(1)->isPointerTy())
+      return 0;
+
+    Value *EndPtr = CI->getArgOperand(1);
+    if (isa<ConstantPointerNull>(EndPtr)) {
+      // With a null EndPtr, this function won't capture the main argument.
+      // It would be readonly too, except that it still may write to errno.
+      CI->addAttribute(1, Attributes::get(Callee->getContext(),
+                                          Attributes::NoCapture));
+    }
+
+    return 0;
+  }
+};
+
 } // End anonymous namespace.
 
 namespace llvm {
@@ -781,6 +801,7 @@ class LibCallSimplifierImpl {
   StrNCpyOpt StrNCpy;
   StrLenOpt StrLen;
   StrPBrkOpt StrPBrk;
+  StrToOpt StrTo;
 
   void initOptimizations();
 public:
@@ -814,6 +835,13 @@ void LibCallSimplifierImpl::initOptimizations() {
   Optimizations["strncpy"] = &StrNCpy;
   Optimizations["strlen"] = &StrLen;
   Optimizations["strpbrk"] = &StrPBrk;
+  Optimizations["strtol"] = &StrTo;
+  Optimizations["strtod"] = &StrTo;
+  Optimizations["strtof"] = &StrTo;
+  Optimizations["strtoul"] = &StrTo;
+  Optimizations["strtoll"] = &StrTo;
+  Optimizations["strtold"] = &StrTo;
+  Optimizations["strtoull"] = &StrTo;
 }
 
 Value *LibCallSimplifierImpl::optimizeCall(CallInst *CI) {
diff --git a/test/Transforms/InstCombine/strto-1.ll b/test/Transforms/InstCombine/strto-1.ll
new file mode 100644
index 0000000000..16c0c67970
--- /dev/null
+++ b/test/Transforms/InstCombine/strto-1.ll
@@ -0,0 +1,82 @@
+; Test that the strto* library call simplifiers 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 i64 @strtol(i8* %s, i8** %endptr, i32 %base)
+; CHECK: declare i64 @strtol(i8*, i8**, i32)
+
+declare double @strtod(i8* %s, i8** %endptr, i32 %base)
+; CHECK: declare double @strtod(i8*, i8**, i32)
+
+declare float @strtof(i8* %s, i8** %endptr, i32 %base)
+; CHECK: declare float @strtof(i8*, i8**, i32)
+
+declare i64 @strtoul(i8* %s, i8** %endptr, i32 %base)
+; CHECK: declare i64 @strtoul(i8*, i8**, i32)
+
+declare i64 @strtoll(i8* %s, i8** %endptr, i32 %base)
+; CHECK: declare i64 @strtoll(i8*, i8**, i32)
+
+declare double @strtold(i8* %s, i8** %endptr)
+; CHECK: declare double @strtold(i8*, i8**)
+
+declare i64 @strtoull(i8* %s, i8** %endptr, i32 %base)
+; CHECK: declare i64 @strtoull(i8*, i8**, i32)
+
+define void @test_simplify1(i8* %x, i8** %endptr) {
+; CHECK: @test_simplify1
+  call i64 @strtol(i8* %x, i8** null, i32 10)
+; CHECK-NEXT: call i64 @strtol(i8* nocapture %x, i8** null, i32 10)
+  ret void
+}
+
+define void @test_simplify2(i8* %x, i8** %endptr) {
+; CHECK: @test_simplify2
+  call double @strtod(i8* %x, i8** null, i32 10)
+; CHECK-NEXT: call double @strtod(i8* nocapture %x, i8** null, i32 10)
+  ret void
+}
+
+define void @test_simplify3(i8* %x, i8** %endptr) {
+; CHECK: @test_simplify3
+  call float @strtof(i8* %x, i8** null, i32 10)
+; CHECK-NEXT: call float @strtof(i8* nocapture %x, i8** null, i32 10)
+  ret void
+}
+
+define void @test_simplify4(i8* %x, i8** %endptr) {
+; CHECK: @test_simplify4
+  call i64 @strtoul(i8* %x, i8** null, i32 10)
+; CHECK-NEXT: call i64 @strtoul(i8* nocapture %x, i8** null, i32 10)
+  ret void
+}
+
+define void @test_simplify5(i8* %x, i8** %endptr) {
+; CHECK: @test_simplify5
+  call i64 @strtoll(i8* %x, i8** null, i32 10)
+; CHECK-NEXT: call i64 @strtoll(i8* nocapture %x, i8** null, i32 10)
+  ret void
+}
+
+define void @test_simplify6(i8* %x, i8** %endptr) {
+; CHECK: @test_simplify6
+  call double @strtold(i8* %x, i8** null)
+; CHECK-NEXT: call double @strtold(i8* nocapture %x, i8** null)
+  ret void
+}
+
+define void @test_simplify7(i8* %x, i8** %endptr) {
+; CHECK: @test_simplify7
+  call i64 @strtoull(i8* %x, i8** null, i32 10)
+; CHECK-NEXT: call i64 @strtoull(i8* nocapture %x, i8** null, i32 10)
+  ret void
+}
+
+define void @test_no_simplify1(i8* %x, i8** %endptr) {
+; CHECK: @test_no_simplify1
+  call i64 @strtol(i8* %x, i8** %endptr, i32 10)
+; CHECK-NEXT: call i64 @strtol(i8* %x, i8** %endptr, i32 10)
+  ret void
+}
diff --git a/test/Transforms/SimplifyLibCalls/2009-02-12-StrTo.ll b/test/Transforms/SimplifyLibCalls/2009-02-12-StrTo.ll
deleted file mode 100644
index 2717228f7e..0000000000
--- a/test/Transforms/SimplifyLibCalls/2009-02-12-StrTo.ll
+++ /dev/null
@@ -1,14 +0,0 @@
-; RUN: opt < %s -simplify-libcalls -S | FileCheck %s
-
-; Test that we add nocapture to the declaration, and to the second call only.
-
-; CHECK: declare float @strtol(i8*, i8** nocapture, i32) nounwind
-declare float @strtol(i8* %s, i8** %endptr, i32 %base)
-
-define void @foo(i8* %x, i8** %endptr) {
-; CHECK:  call float @strtol(i8* %x, i8** %endptr, i32 10)
-  call float @strtol(i8* %x, i8** %endptr, i32 10)
-; CHECK: %2 = call float @strtol(i8* nocapture %x, i8** null, i32 10)
-  call float @strtol(i8* %x, i8** null, i32 10)
-  ret void
-}