diff options
| -rw-r--r-- | lib/Analysis/ConstantFolding.cpp | 38 | ||||
| -rw-r--r-- | test/Transforms/ConstProp/basictest.ll | 11 | ||||
| -rw-r--r-- | test/Transforms/InstCombine/icmp.ll | 4 |
3 files changed, 51 insertions, 2 deletions
diff --git a/lib/Analysis/ConstantFolding.cpp b/lib/Analysis/ConstantFolding.cpp index fe28926..6fbb1fe 100644 --- a/lib/Analysis/ConstantFolding.cpp +++ b/lib/Analysis/ConstantFolding.cpp @@ -52,6 +52,44 @@ static Constant *FoldBitCast(Constant *C, Type *DestTy, if (C->isAllOnesValue() && !DestTy->isX86_MMXTy()) return Constant::getAllOnesValue(DestTy); + // Handle a vector->integer cast. + if (IntegerType *IT = dyn_cast<IntegerType>(DestTy)) { + // FIXME: Remove ConstantVector support. + if ((!isa<ConstantDataVector>(C) && !isa<ConstantVector>(C)) || + // TODO: Handle big endian someday. + !TD.isLittleEndian()) + return ConstantExpr::getBitCast(C, DestTy); + + unsigned NumSrcElts = C->getType()->getVectorNumElements(); + + // If the vector is a vector of floating point, convert it to vector of int + // to simplify things. + if (C->getType()->getVectorElementType()->isFloatingPointTy()) { + unsigned FPWidth = + C->getType()->getVectorElementType()->getPrimitiveSizeInBits(); + Type *SrcIVTy = + VectorType::get(IntegerType::get(C->getContext(), FPWidth), NumSrcElts); + // Ask VMCore to do the conversion now that #elts line up. + C = ConstantExpr::getBitCast(C, SrcIVTy); + } + + // Now that we know that the input value is a vector of integers, just shift + // and insert them into our result. + unsigned BitShift = + TD.getTypeAllocSizeInBits(C->getType()->getVectorElementType()); + APInt Result(IT->getBitWidth(), 0); + for (unsigned i = 0; i != NumSrcElts; ++i) { + // FIXME: Rework when we have ConstantDataVector. + ConstantInt *Elt=dyn_cast_or_null<ConstantInt>(C->getAggregateElement(i)); + if (Elt == 0) // Elt must be a constant expr or something. + return ConstantExpr::getBitCast(C, DestTy); + + Result |= Elt->getValue().zext(IT->getBitWidth()) << i*BitShift; + } + + return ConstantInt::get(IT, Result); + } + // The code below only handles casts to vectors currently. VectorType *DestVTy = dyn_cast<VectorType>(DestTy); if (DestVTy == 0) diff --git a/test/Transforms/ConstProp/basictest.ll b/test/Transforms/ConstProp/basictest.ll index d0d0a5b..09e6e7d 100644 --- a/test/Transforms/ConstProp/basictest.ll +++ b/test/Transforms/ConstProp/basictest.ll @@ -1,5 +1,8 @@ ; RUN: opt < %s -constprop -die -S | FileCheck %s +target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128" +target triple = "x86_64-apple-macosx10.7.2" + ; This is a basic sanity check for constant propagation. The add instruction ; should be eliminated. define i32 @test1(i1 %B) { @@ -40,3 +43,11 @@ define i1 @TNAN() { %C = or i1 %A, %B ret i1 %C } + +define i128 @vector_to_int_cast() { + %A = bitcast <4 x i32> <i32 1073741824, i32 1073741824, i32 1073741824, i32 1073741824> to i128 + ret i128 %A +; CHECK: @vector_to_int_cast +; CHECK: ret i128 85070591750041656499021422275829170176 +} +
\ No newline at end of file diff --git a/test/Transforms/InstCombine/icmp.ll b/test/Transforms/InstCombine/icmp.ll index 5e483cb..6e91ed2 100644 --- a/test/Transforms/InstCombine/icmp.ll +++ b/test/Transforms/InstCombine/icmp.ll @@ -121,8 +121,8 @@ define i1 @test12(i1 %A) { %B = icmp ne i64 bitcast (<2 x i32> <i32 1, i32 -1> to i64), %S ret i1 %B ; CHECK: @test12 -; CHECK-NEXT: %B = select i1 -; CHECK-NEXT: ret i1 %B +; CHECK-NEXT: = xor i1 %A, true +; CHECK-NEXT: ret i1 } ; PR6481 |