[llvm] r197630 - Fix a problem with mips16 stubs when calls are transformed during
Reed Kotler
rkotler at mips.com
Wed Dec 18 15:57:48 PST 2013
Author: rkotler
Date: Wed Dec 18 17:57:48 2013
New Revision: 197630
URL: http://llvm.org/viewvc/llvm-project?rev=197630&view=rev
Log:
Fix a problem with mips16 stubs when calls are transformed during
tail call optimization. Some more work may be needed for indirect
calls but this patch fixes the current regression in Prolangc++/trees.
S2 optimization as part of the general cleanup and optimization
of prolog and epilog was not saving S2 in this case and needed to.
Added:
llvm/trunk/test/CodeGen/Mips/tail16.ll
Modified:
llvm/trunk/lib/Target/Mips/Mips16HardFloat.cpp
Modified: llvm/trunk/lib/Target/Mips/Mips16HardFloat.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/Mips/Mips16HardFloat.cpp?rev=197630&r1=197629&r2=197630&view=diff
==============================================================================
--- llvm/trunk/lib/Target/Mips/Mips16HardFloat.cpp (original)
+++ llvm/trunk/lib/Target/Mips/Mips16HardFloat.cpp Wed Dec 18 17:57:48 2013
@@ -13,6 +13,7 @@
#define DEBUG_TYPE "mips16-hard-float"
#include "Mips16HardFloat.h"
+#include "llvm/IR/Value.h"
#include "llvm/IR/Module.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
@@ -167,6 +168,11 @@ static bool needsFPReturnHelper(Function
return whichFPReturnVariant(RetType) != NoFPRet;
}
+static bool needsFPReturnHelper(const FunctionType &FT) {
+ Type* RetType = FT.getReturnType();
+ return whichFPReturnVariant(RetType) != NoFPRet;
+}
+
static bool needsFPHelperFromSig(Function &F) {
return needsFPStubFromParams(F) || needsFPReturnHelper(F);
}
@@ -400,7 +406,19 @@ static bool fixupFPReturnAndCall
Value *F = (M->getOrInsertFunction(Name, A, MyVoid, T, NULL));
CallInst::Create(F, Params, "", &Inst );
} else if (const CallInst *CI = dyn_cast<CallInst>(I)) {
+ const Value* V = CI->getCalledValue();
+ const Type* T = 0;
+ if (V) T = V->getType();
+ const PointerType *PFT=0;
+ if (T) PFT = dyn_cast<PointerType>(T);
+ const FunctionType *FT=0;
+ if (PFT) FT = dyn_cast<FunctionType>(PFT->getElementType());
Function *F_ = CI->getCalledFunction();
+ if (FT && needsFPReturnHelper(*FT) &&
+ !(F_ && isIntrinsicInline(F_))) {
+ Modified=true;
+ F.addFnAttr("saveS2");
+ }
if (F_ && !isIntrinsicInline(F_)) {
// pic mode calls are handled by already defined
// helper functions
Added: llvm/trunk/test/CodeGen/Mips/tail16.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/Mips/tail16.ll?rev=197630&view=auto
==============================================================================
--- llvm/trunk/test/CodeGen/Mips/tail16.ll (added)
+++ llvm/trunk/test/CodeGen/Mips/tail16.ll Wed Dec 18 17:57:48 2013
@@ -0,0 +1,20 @@
+; RUN: llc -mtriple=mipsel-linux-gnu -march=mipsel -mcpu=mips16 -soft-float -mips16-hard-float -relocation-model=pic < %s | FileCheck %s
+
+; Function Attrs: nounwind optsize
+define float @h() {
+entry:
+ %call = tail call float bitcast (float (...)* @g to float ()*)()
+ ret float %call
+; CHECK: .ent h
+; CHECK: save $16, $ra, $18, 32
+; CHECK: lw ${{[0-9]+}}, %got(__mips16_call_stub_sf_0)(${{[0-9]+}})
+; CHECK: restore $16, $ra, $18, 32
+; CHECK: .end h
+}
+
+; Function Attrs: optsize
+declare float @g(...)
+
+
+
+
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