mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-28 04:33:05 +00:00
instcombine: Migrate strcat and strncat optimizations
This patch migrates the strcat and strncat optimizations from the simplify-libcalls pass into the instcombine library call simplifier. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165874 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Meador Inge
parent
5e8904576a
commit
73d8a5864f
@ -133,105 +133,7 @@ static bool IsOnlyUsedInEqualityComparison(Value *V, Value *With) {
|
||||
// String and Memory LibCall Optimizations
|
||||
//===----------------------------------------------------------------------===//
|
||||
|
||||
//===---------------------------------------===//
|
||||
// 'strcat' Optimizations
|
||||
namespace {
|
||||
struct StrCatOpt : public LibCallOptimization {
|
||||
virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
|
||||
// Verify the "strcat" function prototype.
|
||||
FunctionType *FT = Callee->getFunctionType();
|
||||
if (FT->getNumParams() != 2 ||
|
||||
FT->getReturnType() != B.getInt8PtrTy() ||
|
||||
FT->getParamType(0) != FT->getReturnType() ||
|
||||
FT->getParamType(1) != FT->getReturnType())
|
||||
return 0;
|
||||
|
||||
// Extract some information from the instruction
|
||||
Value *Dst = CI->getArgOperand(0);
|
||||
Value *Src = CI->getArgOperand(1);
|
||||
|
||||
// See if we can get the length of the input string.
|
||||
uint64_t Len = GetStringLength(Src);
|
||||
if (Len == 0) return 0;
|
||||
--Len; // Unbias length.
|
||||
|
||||
// Handle the simple, do-nothing case: strcat(x, "") -> x
|
||||
if (Len == 0)
|
||||
return Dst;
|
||||
|
||||
// These optimizations require DataLayout.
|
||||
if (!TD) return 0;
|
||||
|
||||
return EmitStrLenMemCpy(Src, Dst, Len, B);
|
||||
}
|
||||
|
||||
Value *EmitStrLenMemCpy(Value *Src, Value *Dst, uint64_t Len, IRBuilder<> &B) {
|
||||
// We need to find the end of the destination string. That's where the
|
||||
// memory is to be moved to. We just generate a call to strlen.
|
||||
Value *DstLen = EmitStrLen(Dst, B, TD, TLI);
|
||||
if (!DstLen)
|
||||
return 0;
|
||||
|
||||
// Now that we have the destination's length, we must index into the
|
||||
// destination's pointer to get the actual memcpy destination (end of
|
||||
// the string .. we're concatenating).
|
||||
Value *CpyDst = B.CreateGEP(Dst, DstLen, "endptr");
|
||||
|
||||
// We have enough information to now generate the memcpy call to do the
|
||||
// concatenation for us. Make a memcpy to copy the nul byte with align = 1.
|
||||
B.CreateMemCpy(CpyDst, Src,
|
||||
ConstantInt::get(TD->getIntPtrType(*Context), Len + 1), 1);
|
||||
return Dst;
|
||||
}
|
||||
};
|
||||
|
||||
//===---------------------------------------===//
|
||||
// 'strncat' Optimizations
|
||||
|
||||
struct StrNCatOpt : public StrCatOpt {
|
||||
virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
|
||||
// Verify the "strncat" function prototype.
|
||||
FunctionType *FT = Callee->getFunctionType();
|
||||
if (FT->getNumParams() != 3 ||
|
||||
FT->getReturnType() != B.getInt8PtrTy() ||
|
||||
FT->getParamType(0) != FT->getReturnType() ||
|
||||
FT->getParamType(1) != FT->getReturnType() ||
|
||||
!FT->getParamType(2)->isIntegerTy())
|
||||
return 0;
|
||||
|
||||
// Extract some information from the instruction
|
||||
Value *Dst = CI->getArgOperand(0);
|
||||
Value *Src = CI->getArgOperand(1);
|
||||
uint64_t Len;
|
||||
|
||||
// We don't do anything if length is not constant
|
||||
if (ConstantInt *LengthArg = dyn_cast<ConstantInt>(CI->getArgOperand(2)))
|
||||
Len = LengthArg->getZExtValue();
|
||||
else
|
||||
return 0;
|
||||
|
||||
// See if we can get the length of the input string.
|
||||
uint64_t SrcLen = GetStringLength(Src);
|
||||
if (SrcLen == 0) return 0;
|
||||
--SrcLen; // Unbias length.
|
||||
|
||||
// Handle the simple, do-nothing cases:
|
||||
// strncat(x, "", c) -> x
|
||||
// strncat(x, c, 0) -> x
|
||||
if (SrcLen == 0 || Len == 0) return Dst;
|
||||
|
||||
// These optimizations require DataLayout.
|
||||
if (!TD) return 0;
|
||||
|
||||
// We don't optimize this case
|
||||
if (Len < SrcLen) return 0;
|
||||
|
||||
// strncat(x, s, c) -> strcat(x, s)
|
||||
// s is constant so the strcat can be optimized further
|
||||
return EmitStrLenMemCpy(Src, Dst, SrcLen, B);
|
||||
}
|
||||
};
|
||||
|
||||
//===---------------------------------------===//
|
||||
// 'strchr' Optimizations
|
||||
|
||||
@ -1564,7 +1466,7 @@ namespace {
|
||||
|
||||
StringMap<LibCallOptimization*> Optimizations;
|
||||
// String and Memory LibCall Optimizations
|
||||
StrCatOpt StrCat; StrNCatOpt StrNCat; StrChrOpt StrChr; StrRChrOpt StrRChr;
|
||||
StrChrOpt StrChr; StrRChrOpt StrRChr;
|
||||
StrCmpOpt StrCmp; StrNCmpOpt StrNCmp;
|
||||
StrCpyOpt StrCpy; StrCpyOpt StrCpyChk;
|
||||
StpCpyOpt StpCpy; StpCpyOpt StpCpyChk;
|
||||
@ -1639,8 +1541,6 @@ void SimplifyLibCalls::AddOpt(LibFunc::Func F1, LibFunc::Func F2,
|
||||
/// we know.
|
||||
void SimplifyLibCalls::InitOptimizations() {
|
||||
// String and Memory LibCall Optimizations
|
||||
Optimizations["strcat"] = &StrCat;
|
||||
Optimizations["strncat"] = &StrNCat;
|
||||
Optimizations["strchr"] = &StrChr;
|
||||
Optimizations["strrchr"] = &StrRChr;
|
||||
Optimizations["strcmp"] = &StrCmp;
|
||||
|
||||
@ -222,6 +222,104 @@ struct StrNCpyChkOpt : public InstFortifiedLibCallOptimization {
|
||||
}
|
||||
};
|
||||
|
||||
//===----------------------------------------------------------------------===//
|
||||
// String and Memory Library Call Optimizations
|
||||
//===----------------------------------------------------------------------===//
|
||||
|
||||
struct StrCatOpt : public LibCallOptimization {
|
||||
virtual Value *callOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
|
||||
// Verify the "strcat" function prototype.
|
||||
FunctionType *FT = Callee->getFunctionType();
|
||||
if (FT->getNumParams() != 2 ||
|
||||
FT->getReturnType() != B.getInt8PtrTy() ||
|
||||
FT->getParamType(0) != FT->getReturnType() ||
|
||||
FT->getParamType(1) != FT->getReturnType())
|
||||
return 0;
|
||||
|
||||
// Extract some information from the instruction
|
||||
Value *Dst = CI->getArgOperand(0);
|
||||
Value *Src = CI->getArgOperand(1);
|
||||
|
||||
// See if we can get the length of the input string.
|
||||
uint64_t Len = GetStringLength(Src);
|
||||
if (Len == 0) return 0;
|
||||
--Len; // Unbias length.
|
||||
|
||||
// Handle the simple, do-nothing case: strcat(x, "") -> x
|
||||
if (Len == 0)
|
||||
return Dst;
|
||||
|
||||
// These optimizations require DataLayout.
|
||||
if (!TD) return 0;
|
||||
|
||||
return emitStrLenMemCpy(Src, Dst, Len, B);
|
||||
}
|
||||
|
||||
Value *emitStrLenMemCpy(Value *Src, Value *Dst, uint64_t Len,
|
||||
IRBuilder<> &B) {
|
||||
// We need to find the end of the destination string. That's where the
|
||||
// memory is to be moved to. We just generate a call to strlen.
|
||||
Value *DstLen = EmitStrLen(Dst, B, TD, TLI);
|
||||
if (!DstLen)
|
||||
return 0;
|
||||
|
||||
// Now that we have the destination's length, we must index into the
|
||||
// destination's pointer to get the actual memcpy destination (end of
|
||||
// the string .. we're concatenating).
|
||||
Value *CpyDst = B.CreateGEP(Dst, DstLen, "endptr");
|
||||
|
||||
// We have enough information to now generate the memcpy call to do the
|
||||
// concatenation for us. Make a memcpy to copy the nul byte with align = 1.
|
||||
B.CreateMemCpy(CpyDst, Src,
|
||||
ConstantInt::get(TD->getIntPtrType(*Context), Len + 1), 1);
|
||||
return Dst;
|
||||
}
|
||||
};
|
||||
|
||||
struct StrNCatOpt : public StrCatOpt {
|
||||
virtual Value *callOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
|
||||
// Verify the "strncat" function prototype.
|
||||
FunctionType *FT = Callee->getFunctionType();
|
||||
if (FT->getNumParams() != 3 ||
|
||||
FT->getReturnType() != B.getInt8PtrTy() ||
|
||||
FT->getParamType(0) != FT->getReturnType() ||
|
||||
FT->getParamType(1) != FT->getReturnType() ||
|
||||
!FT->getParamType(2)->isIntegerTy())
|
||||
return 0;
|
||||
|
||||
// Extract some information from the instruction
|
||||
Value *Dst = CI->getArgOperand(0);
|
||||
Value *Src = CI->getArgOperand(1);
|
||||
uint64_t Len;
|
||||
|
||||
// We don't do anything if length is not constant
|
||||
if (ConstantInt *LengthArg = dyn_cast<ConstantInt>(CI->getArgOperand(2)))
|
||||
Len = LengthArg->getZExtValue();
|
||||
else
|
||||
return 0;
|
||||
|
||||
// See if we can get the length of the input string.
|
||||
uint64_t SrcLen = GetStringLength(Src);
|
||||
if (SrcLen == 0) return 0;
|
||||
--SrcLen; // Unbias length.
|
||||
|
||||
// Handle the simple, do-nothing cases:
|
||||
// strncat(x, "", c) -> x
|
||||
// strncat(x, c, 0) -> x
|
||||
if (SrcLen == 0 || Len == 0) return Dst;
|
||||
|
||||
// These optimizations require DataLayout.
|
||||
if (!TD) return 0;
|
||||
|
||||
// We don't optimize this case
|
||||
if (Len < SrcLen) return 0;
|
||||
|
||||
// strncat(x, s, c) -> strcat(x, s)
|
||||
// s is constant so the strcat can be optimized further
|
||||
return emitStrLenMemCpy(Src, Dst, SrcLen, B);
|
||||
}
|
||||
};
|
||||
|
||||
} // End anonymous namespace.
|
||||
|
||||
namespace llvm {
|
||||
@ -239,6 +337,10 @@ class LibCallSimplifierImpl {
|
||||
StrCpyChkOpt StrCpyChk;
|
||||
StrNCpyChkOpt StrNCpyChk;
|
||||
|
||||
// String and memory library call optimizations.
|
||||
StrCatOpt StrCat;
|
||||
StrNCatOpt StrNCat;
|
||||
|
||||
void initOptimizations();
|
||||
public:
|
||||
LibCallSimplifierImpl(const DataLayout *TD, const TargetLibraryInfo *TLI) {
|
||||
@ -258,6 +360,10 @@ void LibCallSimplifierImpl::initOptimizations() {
|
||||
Optimizations["__stpcpy_chk"] = &StrCpyChk;
|
||||
Optimizations["__strncpy_chk"] = &StrNCpyChk;
|
||||
Optimizations["__stpncpy_chk"] = &StrNCpyChk;
|
||||
|
||||
// String and memory library call optimizations.
|
||||
Optimizations["strcat"] = &StrCat;
|
||||
Optimizations["strncat"] = &StrNCat;
|
||||
}
|
||||
|
||||
Value *LibCallSimplifierImpl::optimizeCall(CallInst *CI) {
|
||||
|
||||
38
test/Transforms/InstCombine/strcat-1.ll
Normal file
38
test/Transforms/InstCombine/strcat-1.ll
Normal file
@ -0,0 +1,38 @@
|
||||
; Test that the strcat libcall simplifier works correctly per the
|
||||
; bug found in PR3661.
|
||||
;
|
||||
; 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"
|
||||
|
||||
@hello = constant [6 x i8] c"hello\00"
|
||||
@null = constant [1 x i8] zeroinitializer
|
||||
@null_hello = constant [7 x i8] c"\00hello\00"
|
||||
|
||||
declare i8* @strcat(i8*, i8*)
|
||||
declare i32 @puts(i8*)
|
||||
|
||||
define i32 @main() {
|
||||
; CHECK: @main
|
||||
; CHECK-NOT: call i8* @strcat
|
||||
; CHECK: call i32 @puts
|
||||
|
||||
%target = alloca [1024 x i8]
|
||||
%arg1 = getelementptr [1024 x i8]* %target, i32 0, i32 0
|
||||
store i8 0, i8* %arg1
|
||||
|
||||
; rslt1 = strcat(target, "hello\00")
|
||||
%arg2 = getelementptr [6 x i8]* @hello, i32 0, i32 0
|
||||
%rslt1 = call i8* @strcat(i8* %arg1, i8* %arg2)
|
||||
|
||||
; rslt2 = strcat(rslt1, "\00")
|
||||
%arg3 = getelementptr [1 x i8]* @null, i32 0, i32 0
|
||||
%rslt2 = call i8* @strcat(i8* %rslt1, i8* %arg3)
|
||||
|
||||
; rslt3 = strcat(rslt2, "\00hello\00")
|
||||
%arg4 = getelementptr [7 x i8]* @null_hello, i32 0, i32 0
|
||||
%rslt3 = call i8* @strcat(i8* %rslt2, i8* %arg4)
|
||||
|
||||
call i32 @puts( i8* %rslt3 )
|
||||
ret i32 0
|
||||
}
|
||||
32
test/Transforms/InstCombine/strcat-2.ll
Normal file
32
test/Transforms/InstCombine/strcat-2.ll
Normal file
@ -0,0 +1,32 @@
|
||||
; Test that the strcat libcall 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"
|
||||
|
||||
@hello = constant [6 x i8] c"hello\00"
|
||||
@empty = constant [1 x i8] c"\00"
|
||||
@a = common global [32 x i8] zeroinitializer, align 1
|
||||
|
||||
declare i8* @strcat(i8*, i8*)
|
||||
|
||||
define void @test_simplify1() {
|
||||
; CHECK: @test_simplify1
|
||||
; CHECK-NOT: call i8* @strcat
|
||||
; CHECK: ret void
|
||||
|
||||
%dst = getelementptr [32 x i8]* @a, i32 0, i32 0
|
||||
%src = getelementptr [6 x i8]* @hello, i32 0, i32 0
|
||||
call i8* @strcat(i8* %dst, i8* %src)
|
||||
ret void
|
||||
}
|
||||
|
||||
define void @test_simplify2() {
|
||||
; CHECK: @test_simplify2
|
||||
; CHECK-NEXT: ret void
|
||||
|
||||
%dst = getelementptr [32 x i8]* @a, i32 0, i32 0
|
||||
%src = getelementptr [1 x i8]* @empty, i32 0, i32 0
|
||||
call i8* @strcat(i8* %dst, i8* %src)
|
||||
ret void
|
||||
}
|
||||
22
test/Transforms/InstCombine/strcat-3.ll
Normal file
22
test/Transforms/InstCombine/strcat-3.ll
Normal file
@ -0,0 +1,22 @@
|
||||
; Test that the strcat libcall 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"
|
||||
|
||||
@hello = constant [6 x i8] c"hello\00"
|
||||
@empty = constant [1 x i8] c"\00"
|
||||
@a = common global [32 x i8] zeroinitializer, align 1
|
||||
|
||||
declare i16* @strcat(i8*, i8*)
|
||||
|
||||
define void @test_nosimplify1() {
|
||||
; CHECK: @test_nosimplify1
|
||||
; CHECK: call i16* @strcat
|
||||
; CHECK: ret void
|
||||
|
||||
%dst = getelementptr [32 x i8]* @a, i32 0, i32 0
|
||||
%src = getelementptr [6 x i8]* @hello, i32 0, i32 0
|
||||
call i16* @strcat(i8* %dst, i8* %src)
|
||||
ret void
|
||||
}
|
||||
37
test/Transforms/InstCombine/strncat-1.ll
Normal file
37
test/Transforms/InstCombine/strncat-1.ll
Normal file
@ -0,0 +1,37 @@
|
||||
; Test that the strncat libcall 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"
|
||||
|
||||
@hello = constant [6 x i8] c"hello\00"
|
||||
@null = constant [1 x i8] zeroinitializer
|
||||
@null_hello = constant [7 x i8] c"\00hello\00"
|
||||
|
||||
declare i8* @strncat(i8*, i8*, i32)
|
||||
declare i32 @puts(i8*)
|
||||
|
||||
define i32 @main() {
|
||||
; CHECK: @main
|
||||
; CHECK-NOT: call i8* @strncat
|
||||
; CHECK: call i32 @puts
|
||||
|
||||
%target = alloca [1024 x i8]
|
||||
%arg1 = getelementptr [1024 x i8]* %target, i32 0, i32 0
|
||||
store i8 0, i8* %arg1
|
||||
|
||||
; rslt1 = strncat(target, "hello\00")
|
||||
%arg2 = getelementptr [6 x i8]* @hello, i32 0, i32 0
|
||||
%rslt1 = call i8* @strncat(i8* %arg1, i8* %arg2, i32 6)
|
||||
|
||||
; rslt2 = strncat(rslt1, "\00")
|
||||
%arg3 = getelementptr [1 x i8]* @null, i32 0, i32 0
|
||||
%rslt2 = call i8* @strncat(i8* %rslt1, i8* %arg3, i32 42)
|
||||
|
||||
; rslt3 = strncat(rslt2, "\00hello\00")
|
||||
%arg4 = getelementptr [7 x i8]* @null_hello, i32 0, i32 0
|
||||
%rslt3 = call i8* @strncat(i8* %rslt2, i8* %arg4, i32 42)
|
||||
|
||||
call i32 @puts(i8* %rslt3)
|
||||
ret i32 0
|
||||
}
|
||||
53
test/Transforms/InstCombine/strncat-2.ll
Normal file
53
test/Transforms/InstCombine/strncat-2.ll
Normal file
@ -0,0 +1,53 @@
|
||||
; Test that the strncat libcall 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"
|
||||
|
||||
@hello = constant [6 x i8] c"hello\00"
|
||||
@empty = constant [1 x i8] c"\00"
|
||||
@a = common global [32 x i8] zeroinitializer, align 1
|
||||
|
||||
declare i8* @strncat(i8*, i8*, i32)
|
||||
|
||||
define void @test_simplify1() {
|
||||
; CHECK: @test_simplify1
|
||||
; CHECK-NOT: call i8* @strncat
|
||||
; CHECK: ret void
|
||||
|
||||
%dst = getelementptr [32 x i8]* @a, i32 0, i32 0
|
||||
%src = getelementptr [6 x i8]* @hello, i32 0, i32 0
|
||||
call i8* @strncat(i8* %dst, i8* %src, i32 13)
|
||||
ret void
|
||||
}
|
||||
|
||||
define void @test_simplify2() {
|
||||
; CHECK: @test_simplify2
|
||||
; CHECK-NEXT: ret void
|
||||
|
||||
%dst = getelementptr [32 x i8]* @a, i32 0, i32 0
|
||||
%src = getelementptr [1 x i8]* @empty, i32 0, i32 0
|
||||
call i8* @strncat(i8* %dst, i8* %src, i32 13)
|
||||
ret void
|
||||
}
|
||||
|
||||
define void @test_simplify3() {
|
||||
; CHECK: @test_simplify3
|
||||
; CHECK-NEXT: ret void
|
||||
|
||||
%dst = getelementptr [32 x i8]* @a, i32 0, i32 0
|
||||
%src = getelementptr [6 x i8]* @hello, i32 0, i32 0
|
||||
call i8* @strncat(i8* %dst, i8* %src, i32 0)
|
||||
ret void
|
||||
}
|
||||
|
||||
define void @test_nosimplify1() {
|
||||
; CHECK: @test_nosimplify1
|
||||
; CHECK: call i8* @strncat
|
||||
; CHECK: ret void
|
||||
|
||||
%dst = getelementptr [32 x i8]* @a, i32 0, i32 0
|
||||
%src = getelementptr [6 x i8]* @hello, i32 0, i32 0
|
||||
call i8* @strncat(i8* %dst, i8* %src, i32 1)
|
||||
ret void
|
||||
}
|
||||
22
test/Transforms/InstCombine/strncat-3.ll
Normal file
22
test/Transforms/InstCombine/strncat-3.ll
Normal file
@ -0,0 +1,22 @@
|
||||
; Test that the strncat libcall 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"
|
||||
|
||||
@hello = constant [6 x i8] c"hello\00"
|
||||
@empty = constant [1 x i8] c"\00"
|
||||
@a = common global [32 x i8] zeroinitializer, align 1
|
||||
|
||||
declare i16* @strncat(i8*, i8*, i32)
|
||||
|
||||
define void @test_nosimplify1() {
|
||||
; CHECK: @test_nosimplify1
|
||||
; CHECK: call i16* @strncat
|
||||
; CHECK: ret void
|
||||
|
||||
%dst = getelementptr [32 x i8]* @a, i32 0, i32 0
|
||||
%src = getelementptr [6 x i8]* @hello, i32 0, i32 0
|
||||
call i16* @strncat(i8* %dst, i8* %src, i32 13)
|
||||
ret void
|
||||
}
|
||||
@ -1,33 +0,0 @@
|
||||
; Test that the StrCatOptimizer works correctly
|
||||
; PR3661
|
||||
; RUN: opt < %s -simplify-libcalls -S | \
|
||||
; RUN: not grep "call.*strcat"
|
||||
; RUN: opt < %s -simplify-libcalls -S | \
|
||||
; RUN: grep "puts.*%arg1"
|
||||
|
||||
; This transformation requires the pointer size, as it assumes that size_t is
|
||||
; the size of a pointer.
|
||||
target datalayout = "-p:64:64:64"
|
||||
|
||||
@hello = constant [6 x i8] c"hello\00" ; <[6 x i8]*> [#uses=1]
|
||||
@null = constant [1 x i8] zeroinitializer ; <[1 x i8]*> [#uses=1]
|
||||
@null_hello = constant [7 x i8] c"\00hello\00" ; <[7 x i8]*> [#uses=1]
|
||||
|
||||
declare i8* @strcat(i8*, i8*)
|
||||
|
||||
declare i32 @puts(i8*)
|
||||
|
||||
define i32 @main() {
|
||||
%target = alloca [1024 x i8] ; <[1024 x i8]*> [#uses=1]
|
||||
%arg1 = getelementptr [1024 x i8]* %target, i32 0, i32 0 ; <i8*> [#uses=2]
|
||||
store i8 0, i8* %arg1
|
||||
%arg2 = getelementptr [6 x i8]* @hello, i32 0, i32 0 ; <i8*> [#uses=1]
|
||||
%rslt1 = call i8* @strcat( i8* %arg1, i8* %arg2 ) ; <i8*> [#uses=1]
|
||||
%arg3 = getelementptr [1 x i8]* @null, i32 0, i32 0 ; <i8*> [#uses=1]
|
||||
%rslt2 = call i8* @strcat( i8* %rslt1, i8* %arg3 ) ; <i8*> [#uses=1]
|
||||
%arg4 = getelementptr [7 x i8]* @null_hello, i32 0, i32 0 ; <i8*> [#uses=1]
|
||||
%rslt3 = call i8* @strcat( i8* %rslt2, i8* %arg4 ) ; <i8*> [#uses=1]
|
||||
call i32 @puts( i8* %rslt3 ) ; <i32>:1 [#uses=0]
|
||||
ret i32 0
|
||||
}
|
||||
|
||||
@ -1,31 +0,0 @@
|
||||
; Test that the StrNCatOptimizer works correctly
|
||||
; RUN: opt < %s -simplify-libcalls -S | \
|
||||
; RUN: not grep "call.*strncat"
|
||||
; RUN: opt < %s -simplify-libcalls -S | \
|
||||
; RUN: grep "puts.*%arg1"
|
||||
|
||||
; This transformation requires the pointer size, as it assumes that size_t is
|
||||
; the size of a pointer.
|
||||
target datalayout = "-p:64:64:64"
|
||||
|
||||
@hello = constant [6 x i8] c"hello\00" ; <[6 x i8]*> [#uses=1]
|
||||
@null = constant [1 x i8] zeroinitializer ; <[1 x i8]*> [#uses=1]
|
||||
@null_hello = constant [7 x i8] c"\00hello\00" ; <[7 x i8]*> [#uses=1]
|
||||
|
||||
declare i8* @strncat(i8*, i8*, i32)
|
||||
|
||||
declare i32 @puts(i8*)
|
||||
|
||||
define i32 @main() {
|
||||
%target = alloca [1024 x i8] ; <[1024 x i8]*> [#uses=1]
|
||||
%arg1 = getelementptr [1024 x i8]* %target, i32 0, i32 0 ; <i8*> [#uses=2]
|
||||
store i8 0, i8* %arg1
|
||||
%arg2 = getelementptr [6 x i8]* @hello, i32 0, i32 0 ; <i8*> [#uses=1]
|
||||
%rslt1 = call i8* @strncat( i8* %arg1, i8* %arg2, i32 6 ) ; <i8*> [#uses=1]
|
||||
%arg3 = getelementptr [1 x i8]* @null, i32 0, i32 0 ; <i8*> [#uses=1]
|
||||
%rslt2 = call i8* @strncat( i8* %rslt1, i8* %arg3, i32 42 ) ; <i8*> [#uses=1]
|
||||
%arg4 = getelementptr [7 x i8]* @null_hello, i32 0, i32 0 ; <i8*> [#uses=1]
|
||||
%rslt3 = call i8* @strncat( i8* %rslt2, i8* %arg4, i32 42 ) ; <i8*> [#uses=1]
|
||||
call i32 @puts( i8* %rslt3 ) ; <i32>:1 [#uses=0]
|
||||
ret i32 0
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user