[cfe-commits] r149794 - in /cfe/trunk: lib/CodeGen/CGBuiltin.cpp test/CodeGen/arm-vector-align.c
Bob Wilson
bob.wilson at apple.com
Sat Feb 4 15:58:09 PST 2012
Author: bwilson
Date: Sat Feb 4 17:58:08 2012
New Revision: 149794
URL: http://llvm.org/viewvc/llvm-project?rev=149794&view=rev
Log:
Preserve alignment for Neon vld1_lane/dup and vst1_lane intrinsics.
We had been generating load/store instructions with the default alignment
for the vector element type, even when the pointer argument had less alignment.
<rdar://problem/10538555>
Modified:
cfe/trunk/lib/CodeGen/CGBuiltin.cpp
cfe/trunk/test/CodeGen/arm-vector-align.c
Modified: cfe/trunk/lib/CodeGen/CGBuiltin.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/CodeGen/CGBuiltin.cpp?rev=149794&r1=149793&r2=149794&view=diff
==============================================================================
--- cfe/trunk/lib/CodeGen/CGBuiltin.cpp (original)
+++ cfe/trunk/lib/CodeGen/CGBuiltin.cpp Sat Feb 4 17:58:08 2012
@@ -1516,20 +1516,25 @@
return EmitNeonCall(CGM.getIntrinsic(Intrinsic::arm_neon_vld1, Ty),
Ops, "vld1");
case ARM::BI__builtin_neon_vld1_lane_v:
- case ARM::BI__builtin_neon_vld1q_lane_v:
+ case ARM::BI__builtin_neon_vld1q_lane_v: {
Ops[1] = Builder.CreateBitCast(Ops[1], Ty);
Ty = llvm::PointerType::getUnqual(VTy->getElementType());
Ops[0] = Builder.CreateBitCast(Ops[0], Ty);
- Ops[0] = Builder.CreateLoad(Ops[0]);
- return Builder.CreateInsertElement(Ops[1], Ops[0], Ops[2], "vld1_lane");
+ LoadInst *Ld = Builder.CreateLoad(Ops[0]);
+ Value *Align = GetPointeeAlignment(*this, E->getArg(0));
+ Ld->setAlignment(cast<ConstantInt>(Align)->getZExtValue());
+ return Builder.CreateInsertElement(Ops[1], Ld, Ops[2], "vld1_lane");
+ }
case ARM::BI__builtin_neon_vld1_dup_v:
case ARM::BI__builtin_neon_vld1q_dup_v: {
Value *V = UndefValue::get(Ty);
Ty = llvm::PointerType::getUnqual(VTy->getElementType());
Ops[0] = Builder.CreateBitCast(Ops[0], Ty);
- Ops[0] = Builder.CreateLoad(Ops[0]);
+ LoadInst *Ld = Builder.CreateLoad(Ops[0]);
+ Value *Align = GetPointeeAlignment(*this, E->getArg(0));
+ Ld->setAlignment(cast<ConstantInt>(Align)->getZExtValue());
llvm::Constant *CI = ConstantInt::get(Int32Ty, 0);
- Ops[0] = Builder.CreateInsertElement(V, Ops[0], CI);
+ Ops[0] = Builder.CreateInsertElement(V, Ld, CI);
return EmitNeonSplat(Ops[0], CI);
}
case ARM::BI__builtin_neon_vld2_v:
@@ -1877,11 +1882,16 @@
return EmitNeonCall(CGM.getIntrinsic(Intrinsic::arm_neon_vst1, Ty),
Ops, "");
case ARM::BI__builtin_neon_vst1_lane_v:
- case ARM::BI__builtin_neon_vst1q_lane_v:
+ case ARM::BI__builtin_neon_vst1q_lane_v: {
Ops[1] = Builder.CreateBitCast(Ops[1], Ty);
Ops[1] = Builder.CreateExtractElement(Ops[1], Ops[2]);
Ty = llvm::PointerType::getUnqual(Ops[1]->getType());
- return Builder.CreateStore(Ops[1], Builder.CreateBitCast(Ops[0], Ty));
+ StoreInst *St = Builder.CreateStore(Ops[1],
+ Builder.CreateBitCast(Ops[0], Ty));
+ Value *Align = GetPointeeAlignment(*this, E->getArg(0));
+ St->setAlignment(cast<ConstantInt>(Align)->getZExtValue());
+ return St;
+ }
case ARM::BI__builtin_neon_vst2_v:
case ARM::BI__builtin_neon_vst2q_v:
Ops.push_back(GetPointeeAlignment(*this, E->getArg(0)));
Modified: cfe/trunk/test/CodeGen/arm-vector-align.c
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CodeGen/arm-vector-align.c?rev=149794&r1=149793&r2=149794&view=diff
==============================================================================
--- cfe/trunk/test/CodeGen/arm-vector-align.c (original)
+++ cfe/trunk/test/CodeGen/arm-vector-align.c Sat Feb 4 17:58:08 2012
@@ -12,8 +12,18 @@
// intrinsics.
typedef float AlignedAddr __attribute__ ((aligned (16)));
void t1(AlignedAddr *addr1, AlignedAddr *addr2) {
+// CHECK: @t1
// CHECK: call <4 x float> @llvm.arm.neon.vld1.v4f32(i8* %{{.*}}, i32 16)
float32x4_t a = vld1q_f32(addr1);
// CHECK: call void @llvm.arm.neon.vst1.v4f32(i8* %{{.*}}, <4 x float> %{{.*}}, i32 16)
vst1q_f32(addr2, a);
}
+
+// Radar 10538555: Make sure unaligned load/stores do not gain alignment.
+void t2(char *addr) {
+// CHECK: @t2
+// CHECK: load i32* %{{.*}}, align 1
+ int32x2_t vec = vld1_dup_s32(addr);
+// CHECK: store i32 %{{.*}}, i32* {{.*}}, align 1
+ vst1_lane_s32(addr, vec, 1);
+}
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