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Fix memcmp code-gen to honor -fno-builtin.

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I noticed that SelectionDAGBuilder::visitCall was missing a check for memcmp
in TargetLibraryInfo, so that it would use custom code for memcmp calls even
with -fno-builtin.  I also had to add a new -disable-simplify-libcalls option
to llc so that I could write a test for this.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161262 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bob Wilson 2012-08-03 21:26:18 +00:00
parent b2beac2b96
commit 772af92cb1
3 changed files with 16 additions and 1 deletions
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2
lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
View File

@ -5682,7 +5682,7 @@ void SelectionDAGBuilder::visitCall(const CallInst &I) {
Tmp.getValueType(), Tmp));
return;
}
} else if (Name == "memcmp") {
} else if ((LibInfo->has(LibFunc::memcmp) && Name == "memcmp")) {
if (visitMemCmpCall(I))
return;
}

3
test/CodeGen/X86/memcmp.ll
View File

@ -1,4 +1,5 @@
; RUN: llc < %s -mtriple=x86_64-linux | FileCheck %s
; RUN: llc < %s -disable-simplify-libcalls -mtriple=x86_64-linux | FileCheck %s --check-prefix=NOBUILTIN
; RUN: llc < %s -mtriple=x86_64-win32 | FileCheck %s
; This tests codegen time inlining/optimization of memcmp
@ -23,6 +24,8 @@ return: ; preds = %entry
; CHECK: memcmp2:
; CHECK: movw ([[A0:%rdi|%rcx]]), %ax
; CHECK: cmpw ([[A1:%rsi|%rdx]]), %ax
; NOBUILTIN: memcmp2:
; NOBUILTIN: callq
}
define void @memcmp2a(i8* %X, i32* nocapture %P) nounwind {

12
tools/llc/llc.cpp
View File

@ -35,6 +35,7 @@
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/TargetSelect.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetLibraryInfo.h"
#include "llvm/Target/TargetMachine.h"
#include <memory>
using namespace llvm;
@ -213,6 +214,11 @@ DontPlaceZerosInBSS("nozero-initialized-in-bss",
cl::desc("Don't place zero-initialized symbols into bss section"),
cl::init(false));
static cl::opt<bool>
DisableSimplifyLibCalls("disable-simplify-libcalls",
cl::desc("Disable simplify-libcalls"),
cl::init(false));
static cl::opt<bool>
EnableGuaranteedTailCallOpt("tailcallopt",
cl::desc("Turn fastcc calls into tail calls by (potentially) changing ABI."),
@ -487,6 +493,12 @@ int main(int argc, char **argv) {
// Build up all of the passes that we want to do to the module.
PassManager PM;
// Add an appropriate TargetLibraryInfo pass for the module's triple.
TargetLibraryInfo *TLI = new TargetLibraryInfo(TheTriple);
if (DisableSimplifyLibCalls)
TLI->disableAllFunctions();
PM.add(TLI);
// Add the target data from the target machine, if it exists, or the module.
if (const TargetData *TD = Target.getTargetData())
PM.add(new TargetData(*TD));