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[SeparateConstOffsetFromGEP] propagate const offset through GEP chains (#143470)

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When separating the constant offset from a GEP, if the pointer operand
is a constant ptradd (likely generated when we performed this transform
on that GEP), we accumulate the offset into the current offset. This
ensures that when there is a chain of GEPs the constant offset reaches
the final memory instruction where it can likely be folded into the
addressing.
This commit is contained in:
Alex MacLean 2025-08-21 13:37:24 -07:00 committed by GitHub
parent 76b8e19203
commit 4a9d2187ee
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
5 changed files with 465 additions and 26 deletions
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48
llvm/lib/Transforms/Scalar/SeparateConstOffsetFromGEP.cpp
View File

@ -1039,19 +1039,31 @@ bool SeparateConstOffsetFromGEP::splitGEP(GetElementPtrInst *GEP) {
if (GEP->getType()->isVectorTy())
return false;
// If the base of this GEP is a ptradd of a constant, lets pass the constant
// along. This ensures that when we have a chain of GEPs the constant
// offset from each is accumulated.
Value *NewBase;
const APInt *BaseOffset;
const bool ExtractBase =
match(GEP->getPointerOperand(),
m_PtrAdd(m_Value(NewBase), m_APInt(BaseOffset)));
const int64_t BaseByteOffset = ExtractBase ? BaseOffset->getSExtValue() : 0;
// The backend can already nicely handle the case where all indices are
// constant.
if (GEP->hasAllConstantIndices())
if (GEP->hasAllConstantIndices() && !ExtractBase)
return false;
bool Changed = canonicalizeArrayIndicesToIndexSize(GEP);
bool NeedsExtraction;
int64_t AccumulativeByteOffset = accumulateByteOffset(GEP, NeedsExtraction);
int64_t AccumulativeByteOffset =
BaseByteOffset + accumulateByteOffset(GEP, NeedsExtraction);
TargetTransformInfo &TTI = GetTTI(*GEP->getFunction());
if (!NeedsExtraction) {
if (!NeedsExtraction && !ExtractBase) {
Changed |= reorderGEP(GEP, TTI);
return Changed;
}
@ -1075,7 +1087,9 @@ bool SeparateConstOffsetFromGEP::splitGEP(GetElementPtrInst *GEP) {
// Track information for preserving GEP flags.
bool AllOffsetsNonNegative = AccumulativeByteOffset >= 0;
bool AllNUWPreserved = true;
bool AllNUWPreserved = GEP->hasNoUnsignedWrap();
bool NewGEPInBounds = GEP->isInBounds();
bool NewGEPNUSW = GEP->hasNoUnsignedSignedWrap();
// Remove the constant offset in each sequential index. The resultant GEP
// computes the variadic base.
@ -1111,6 +1125,16 @@ bool SeparateConstOffsetFromGEP::splitGEP(GetElementPtrInst *GEP) {
}
}
}
if (ExtractBase) {
GEPOperator *Base = cast<GEPOperator>(GEP->getPointerOperand());
AllNUWPreserved &= Base->hasNoUnsignedWrap();
NewGEPInBounds &= Base->isInBounds();
NewGEPNUSW &= Base->hasNoUnsignedSignedWrap();
AllOffsetsNonNegative &= BaseByteOffset >= 0;
GEP->setOperand(0, NewBase);
RecursivelyDeleteTriviallyDeadInstructions(Base);
}
// Clear the inbounds attribute because the new index may be off-bound.
// e.g.,
@ -1138,7 +1162,7 @@ bool SeparateConstOffsetFromGEP::splitGEP(GetElementPtrInst *GEP) {
// If the initial GEP was NUW and all operations that we reassociate were NUW
// additions, the resulting GEPs are also NUW.
if (GEP->hasNoUnsignedWrap() && AllNUWPreserved) {
if (AllNUWPreserved) {
NewGEPFlags |= GEPNoWrapFlags::noUnsignedWrap();
// If the initial GEP additionally had NUSW (or inbounds, which implies
// NUSW), we know that the indices in the initial GEP must all have their
@ -1146,13 +1170,13 @@ bool SeparateConstOffsetFromGEP::splitGEP(GetElementPtrInst *GEP) {
// add-operands therefore also don't have their signbit set. Therefore, all
// indices of the resulting GEPs are non-negative -> we can preserve
// the inbounds/nusw flag.
CanPreserveInBoundsNUSW |= GEP->hasNoUnsignedSignedWrap();
CanPreserveInBoundsNUSW |= NewGEPNUSW;
}
if (CanPreserveInBoundsNUSW) {
if (GEP->isInBounds())
if (NewGEPInBounds)
NewGEPFlags |= GEPNoWrapFlags::inBounds();
else if (GEP->hasNoUnsignedSignedWrap())
else if (NewGEPNUSW)
NewGEPFlags |= GEPNoWrapFlags::noUnsignedSignedWrap();
}
@ -1220,11 +1244,13 @@ bool SeparateConstOffsetFromGEP::run(Function &F) {
DL = &F.getDataLayout();
bool Changed = false;
for (BasicBlock &B : F) {
if (!DT->isReachableFromEntry(&B))
ReversePostOrderTraversal<Function *> RPOT(&F);
for (BasicBlock *B : RPOT) {
if (!DT->isReachableFromEntry(B))
continue;
for (Instruction &I : llvm::make_early_inc_range(B))
for (Instruction &I : llvm::make_early_inc_range(*B))
if (GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(&I))
Changed |= splitGEP(GEP);
// No need to split GEP ConstantExprs because all its indices are constant

10
llvm/test/CodeGen/AMDGPU/machine-sink-temporal-divergence-swdev407790.ll
View File

@ -279,11 +279,11 @@ define protected amdgpu_kernel void @kernel_round1(ptr addrspace(1) nocapture no
; CHECK-NEXT: v_lshlrev_b32_e32 v0, 2, v0
; CHECK-NEXT: ds_write_b32 v0, v58
; CHECK-NEXT: s_branch .LBB0_7
; CHECK-NEXT: .LBB0_16: ; %Flow45
; CHECK-NEXT: .LBB0_16: ; %Flow43
; CHECK-NEXT: ; in Loop: Header=BB0_5 Depth=1
; CHECK-NEXT: s_or_b32 exec_lo, exec_lo, s69
; CHECK-NEXT: v_mov_b32_e32 v57, v0
; CHECK-NEXT: .LBB0_17: ; %Flow46
; CHECK-NEXT: .LBB0_17: ; %Flow44
; CHECK-NEXT: ; in Loop: Header=BB0_5 Depth=1
; CHECK-NEXT: s_or_b32 exec_lo, exec_lo, s68
; CHECK-NEXT: s_mov_b32 s55, exec_lo
@ -330,11 +330,11 @@ define protected amdgpu_kernel void @kernel_round1(ptr addrspace(1) nocapture no
; CHECK-NEXT: v_lshlrev_b32_e32 v0, 2, v0
; CHECK-NEXT: ds_write_b32 v0, v57
; CHECK-NEXT: s_branch .LBB0_19
; CHECK-NEXT: .LBB0_22: ; %Flow43
; CHECK-NEXT: .LBB0_22: ; %Flow41
; CHECK-NEXT: ; in Loop: Header=BB0_5 Depth=1
; CHECK-NEXT: s_inst_prefetch 0x2
; CHECK-NEXT: s_or_b32 exec_lo, exec_lo, s68
; CHECK-NEXT: .LBB0_23: ; %Flow44
; CHECK-NEXT: .LBB0_23: ; %Flow42
; CHECK-NEXT: ; in Loop: Header=BB0_5 Depth=1
; CHECK-NEXT: s_or_b32 exec_lo, exec_lo, s55
; CHECK-NEXT: ; %bb.24: ; in Loop: Header=BB0_5 Depth=1
@ -347,7 +347,7 @@ define protected amdgpu_kernel void @kernel_round1(ptr addrspace(1) nocapture no
; CHECK-NEXT: s_or_b32 s53, s4, s53
; CHECK-NEXT: s_andn2_b32 exec_lo, exec_lo, s53
; CHECK-NEXT: s_cbranch_execnz .LBB0_5
; CHECK-NEXT: .LBB0_25: ; %Flow51
; CHECK-NEXT: .LBB0_25: ; %Flow49
; CHECK-NEXT: s_or_b32 exec_lo, exec_lo, s52
; CHECK-NEXT: v_mov_b32_e32 v31, v40
; CHECK-NEXT: v_mov_b32_e32 v0, 1

8
llvm/test/Transforms/SeparateConstOffsetFromGEP/AMDGPU/reorder-gep-inbounds.ll
View File

@ -279,8 +279,8 @@ define void @addrspace3(ptr addrspace(3) %in.ptr, i64 %in.idx1) {
; CHECK-NEXT: entry:
; CHECK-NEXT: [[IN_IDX1_NNEG:%.*]] = and i64 [[IN_IDX1]], 9223372036854775807
; CHECK-NEXT: [[IDXPROM:%.*]] = trunc i64 [[IN_IDX1_NNEG]] to i32
; CHECK-NEXT: [[TMP0:%.*]] = getelementptr i128, ptr addrspace(3) [[IN_PTR]], i32 [[IDXPROM]]
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr i8, ptr addrspace(3) [[TMP0]], i64 1024
; CHECK-NEXT: [[TMP0:%.*]] = getelementptr inbounds i128, ptr addrspace(3) [[IN_PTR]], i32 [[IDXPROM]]
; CHECK-NEXT: [[IDX11:%.*]] = getelementptr inbounds i8, ptr addrspace(3) [[TMP0]], i32 1024
; CHECK-NEXT: ret void
;
entry:
@ -296,8 +296,8 @@ define void @addrspace7(ptr addrspace(7) %in.ptr, i64 %in.idx1) {
; CHECK-NEXT: entry:
; CHECK-NEXT: [[IN_IDX1_NNEG:%.*]] = and i64 [[IN_IDX1]], 9223372036854775807
; CHECK-NEXT: [[IDXPROM:%.*]] = trunc i64 [[IN_IDX1_NNEG]] to i32
; CHECK-NEXT: [[TMP0:%.*]] = getelementptr i128, ptr addrspace(7) [[IN_PTR]], i32 [[IDXPROM]]
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr i8, ptr addrspace(7) [[TMP0]], i64 1024
; CHECK-NEXT: [[TMP0:%.*]] = getelementptr inbounds i128, ptr addrspace(7) [[IN_PTR]], i32 [[IDXPROM]]
; CHECK-NEXT: [[IDX11:%.*]] = getelementptr inbounds i8, ptr addrspace(7) [[TMP0]], i32 1024
; CHECK-NEXT: ret void
;
entry:

12
llvm/test/Transforms/SeparateConstOffsetFromGEP/AMDGPU/reorder-gep.ll
View File

@ -74,13 +74,13 @@ define void @reorder_i8half(ptr addrspace(3) %in.ptr, i64 %in.idx0, i64 %in.idx1
; CHECK-NEXT: [[IDX0:%.*]] = getelementptr half, ptr addrspace(3) [[BASE]], i32 [[IDXPROM1]]
; CHECK-NEXT: [[IDXPROM2:%.*]] = trunc i64 [[IN_IDX1]] to i32
; CHECK-NEXT: [[TMP0:%.*]] = getelementptr half, ptr addrspace(3) [[BASE]], i32 [[IDXPROM2]]
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr i8, ptr addrspace(3) [[TMP0]], i64 256
; CHECK-NEXT: [[IDX13:%.*]] = getelementptr i8, ptr addrspace(3) [[TMP0]], i32 256
; CHECK-NEXT: [[IDXPROM3:%.*]] = trunc i64 [[IN_IDX1]] to i32
; CHECK-NEXT: [[TMP2:%.*]] = getelementptr half, ptr addrspace(3) [[BASE]], i32 [[IDXPROM3]]
; CHECK-NEXT: [[TMP3:%.*]] = getelementptr i8, ptr addrspace(3) [[TMP2]], i64 512
; CHECK-NEXT: [[IDX25:%.*]] = getelementptr i8, ptr addrspace(3) [[TMP2]], i32 512
; CHECK-NEXT: [[IDXPROM4:%.*]] = trunc i64 [[IN_IDX1]] to i32
; CHECK-NEXT: [[TMP4:%.*]] = getelementptr half, ptr addrspace(3) [[BASE]], i32 [[IDXPROM4]]
; CHECK-NEXT: [[TMP5:%.*]] = getelementptr i8, ptr addrspace(3) [[TMP4]], i64 768
; CHECK-NEXT: [[IDX37:%.*]] = getelementptr i8, ptr addrspace(3) [[TMP4]], i32 768
; CHECK-NEXT: ret void
;
entry:
@ -169,13 +169,13 @@ define void @bad_index(ptr addrspace(3) %in.ptr, i64 %in.idx0, i64 %in.idx1) {
; CHECK-NEXT: [[IDX0:%.*]] = getelementptr half, ptr addrspace(3) [[BASE]], i32 [[IDXPROM1]]
; CHECK-NEXT: [[IDXPROM2:%.*]] = trunc i64 [[IN_IDX1]] to i32
; CHECK-NEXT: [[TMP4:%.*]] = getelementptr half, ptr addrspace(3) [[BASE]], i32 [[IDXPROM2]]
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr i8, ptr addrspace(3) [[TMP4]], i64 1
; CHECK-NEXT: [[IDX13:%.*]] = getelementptr i8, ptr addrspace(3) [[TMP4]], i32 1
; CHECK-NEXT: [[IDXPROM3:%.*]] = trunc i64 [[IN_IDX1]] to i32
; CHECK-NEXT: [[TMP2:%.*]] = getelementptr half, ptr addrspace(3) [[BASE]], i32 [[IDXPROM3]]
; CHECK-NEXT: [[TMP3:%.*]] = getelementptr i8, ptr addrspace(3) [[TMP2]], i64 2
; CHECK-NEXT: [[IDX25:%.*]] = getelementptr i8, ptr addrspace(3) [[TMP2]], i32 2
; CHECK-NEXT: [[IDXPROM4:%.*]] = trunc i64 [[IN_IDX1]] to i32
; CHECK-NEXT: [[TMP0:%.*]] = getelementptr half, ptr addrspace(3) [[BASE]], i32 [[IDXPROM4]]
; CHECK-NEXT: [[TMP5:%.*]] = getelementptr i8, ptr addrspace(3) [[TMP0]], i64 3
; CHECK-NEXT: [[IDX37:%.*]] = getelementptr i8, ptr addrspace(3) [[TMP0]], i32 3
; CHECK-NEXT: ret void
;
entry:

413
llvm/test/Transforms/SeparateConstOffsetFromGEP/NVPTX/gep-chain.ll Normal file
View File

@ -0,0 +1,413 @@
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
; RUN: opt -mtriple=nvptx64-nvidia-cuda -S -passes=separate-const-offset-from-gep < %s | FileCheck %s
%struct.uchar4 = type { i8, i8, i8, i8 }
define ptr @basic(ptr %ptr, i64 %offset1, i64 %offset2) {
; CHECK-LABEL: define ptr @basic(
; CHECK-SAME: ptr [[PTR:%.*]], i64 [[OFFSET1:%.*]], i64 [[OFFSET2:%.*]]) {
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr [[STRUCT_UCHAR4:%.*]], ptr [[PTR]], i64 [[OFFSET1]]
; CHECK-NEXT: [[TMP2:%.*]] = getelementptr [[STRUCT_UCHAR4]], ptr [[TMP1]], i64 [[OFFSET2]]
; CHECK-NEXT: [[GEP24:%.*]] = getelementptr i8, ptr [[TMP2]], i64 72
; CHECK-NEXT: ret ptr [[GEP24]]
;
%offset3 = add i64 %offset1, 8
%gep1 = getelementptr %struct.uchar4, ptr %ptr, i64 %offset3
%offset4 = add i64 %offset2, 10
%gep2 = getelementptr %struct.uchar4, ptr %gep1, i64 %offset4
ret ptr %gep2
}
define i32 @more_interesting(ptr %ptr, i32 %offset1, i32 %offset2) {
; CHECK-LABEL: define i32 @more_interesting(
; CHECK-SAME: ptr [[PTR:%.*]], i32 [[OFFSET1:%.*]], i32 [[OFFSET2:%.*]]) {
; CHECK-NEXT: [[IDXPROM:%.*]] = sext i32 [[OFFSET1]] to i64
; CHECK-NEXT: [[GEP1:%.*]] = getelementptr inbounds [[STRUCT_UCHAR4:%.*]], ptr [[PTR]], i64 [[IDXPROM]]
; CHECK-NEXT: [[IDXPROM1:%.*]] = sext i32 [[OFFSET2]] to i64
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr inbounds [[STRUCT_UCHAR4]], ptr [[GEP1]], i64 [[IDXPROM1]]
; CHECK-NEXT: [[TMP2:%.*]] = getelementptr inbounds i8, ptr [[TMP1]], i64 8
; CHECK-NEXT: [[V1:%.*]] = load i32, ptr [[TMP2]], align 4
; CHECK-NEXT: [[IDXPROM2:%.*]] = sext i32 [[OFFSET2]] to i64
; CHECK-NEXT: [[TMP4:%.*]] = getelementptr inbounds [[STRUCT_UCHAR4]], ptr [[TMP1]], i64 [[IDXPROM2]]
; CHECK-NEXT: [[V2:%.*]] = load i32, ptr [[TMP4]], align 4
; CHECK-NEXT: [[R:%.*]] = add i32 [[V1]], [[V2]]
; CHECK-NEXT: ret i32 [[R]]
;
%gep1 = getelementptr inbounds %struct.uchar4, ptr %ptr, i32 %offset1
%gep2 = getelementptr inbounds nuw i8, ptr %gep1, i32 8
%gep3 = getelementptr inbounds %struct.uchar4, ptr %gep2, i32 %offset2
%v1 = load i32, ptr %gep3, align 4
%gep4 = getelementptr inbounds i8, ptr %gep3, i32 -8
%gep5 = getelementptr inbounds %struct.uchar4, ptr %gep4, i32 %offset2
%v2 = load i32, ptr %gep5, align 4
%r = add i32 %v1, %v2
ret i32 %r
}
;; Check nuw/nusw/inbounds flag propagation
; GEPs with nusw flag. All indices and offsets are non-negative.
define ptr @test_0(ptr %p, i32 %i) {
; CHECK-LABEL: define ptr @test_0(
; CHECK-SAME: ptr [[P:%.*]], i32 [[I:%.*]]) {
; CHECK-NEXT: [[I_PROM:%.*]] = zext i32 [[I]] to i64
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr nusw i8, ptr [[P]], i64 [[I_PROM]]
; CHECK-NEXT: [[ARRAYIDX22:%.*]] = getelementptr nusw i8, ptr [[TMP1]], i64 2
; CHECK-NEXT: ret ptr [[ARRAYIDX22]]
;
%ptradd = getelementptr nuw inbounds i8, ptr %p, i32 1
%i.prom = zext i32 %i to i64
%idx2 = add i64 %i.prom, 1
%arrayidx2 = getelementptr nusw i8, ptr %ptradd, i64 %idx2
ret ptr %arrayidx2
}
; GEPs with inbounds flag. All indices and offsets are non-negative.
define ptr @test_1(ptr %p, i32 %i) {
; CHECK-LABEL: define ptr @test_1(
; CHECK-SAME: ptr [[P:%.*]], i32 [[I:%.*]]) {
; CHECK-NEXT: [[I_PROM:%.*]] = zext i32 [[I]] to i64
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr inbounds i8, ptr [[P]], i64 [[I_PROM]]
; CHECK-NEXT: [[ARRAYIDX22:%.*]] = getelementptr inbounds i8, ptr [[TMP1]], i64 2
; CHECK-NEXT: ret ptr [[ARRAYIDX22]]
;
%ptradd = getelementptr inbounds i8, ptr %p, i32 1
%i.prom = zext i32 %i to i64
%idx2 = add i64 %i.prom, 1
%arrayidx2 = getelementptr nuw inbounds i8, ptr %ptradd, i64 %idx2
ret ptr %arrayidx2
}
; GEPs with nusw flag. All indices and offsets are non-negative.
define ptr @test_2(ptr %p, i32 %i) {
; CHECK-LABEL: define ptr @test_2(
; CHECK-SAME: ptr [[P:%.*]], i32 [[I:%.*]]) {
; CHECK-NEXT: [[I_PROM:%.*]] = zext i32 [[I]] to i64
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr nusw i8, ptr [[P]], i64 [[I_PROM]]
; CHECK-NEXT: [[ARRAYIDX22:%.*]] = getelementptr nusw i8, ptr [[TMP1]], i64 2
; CHECK-NEXT: ret ptr [[ARRAYIDX22]]
;
%ptradd = getelementptr nusw i8, ptr %p, i32 1
%i.prom = zext i32 %i to i64
%idx2 = add nuw i64 %i.prom, 1
%arrayidx2 = getelementptr nuw inbounds i8, ptr %ptradd, i64 %idx2
ret ptr %arrayidx2
}
; GEPs with inbounds flag. All indices and offsets are non-negative.
define ptr @test_3(ptr %p, i32 %i) {
; CHECK-LABEL: define ptr @test_3(
; CHECK-SAME: ptr [[P:%.*]], i32 [[I:%.*]]) {
; CHECK-NEXT: [[I_PROM:%.*]] = zext i32 [[I]] to i64
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr inbounds i8, ptr [[P]], i64 [[I_PROM]]
; CHECK-NEXT: [[ARRAYIDX22:%.*]] = getelementptr inbounds i8, ptr [[TMP1]], i64 2
; CHECK-NEXT: ret ptr [[ARRAYIDX22]]
;
%ptradd = getelementptr nuw inbounds i8, ptr %p, i32 1
%i.prom = zext i32 %i to i64
%idx2 = add nuw i64 %i.prom, 1
%arrayidx2 = getelementptr inbounds i8, ptr %ptradd, i64 %idx2
ret ptr %arrayidx2
}
; GEPs with nusw flag. All indices and offsets are non-negative.
define ptr @test_4(ptr %p, i32 %i) {
; CHECK-LABEL: define ptr @test_4(
; CHECK-SAME: ptr [[P:%.*]], i32 [[I:%.*]]) {
; CHECK-NEXT: [[I_PROM:%.*]] = zext i32 [[I]] to i64
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr nusw i8, ptr [[P]], i64 [[I_PROM]]
; CHECK-NEXT: [[ARRAYIDX22:%.*]] = getelementptr nusw i8, ptr [[TMP1]], i64 2
; CHECK-NEXT: ret ptr [[ARRAYIDX22]]
;
%ptradd = getelementptr nuw inbounds i8, ptr %p, i32 1
%i.prom = zext i32 %i to i64
%idx2 = add i64 %i.prom, 1
%arrayidx2 = getelementptr nuw nusw i8, ptr %ptradd, i64 %idx2
ret ptr %arrayidx2
}
; GEPs with inbounds flag. All indices and offsets are non-negative.
define ptr @test_5(ptr %p, i32 %i) {
; CHECK-LABEL: define ptr @test_5(
; CHECK-SAME: ptr [[P:%.*]], i32 [[I:%.*]]) {
; CHECK-NEXT: [[I_PROM:%.*]] = zext i32 [[I]] to i64
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr inbounds i8, ptr [[P]], i64 [[I_PROM]]
; CHECK-NEXT: [[ARRAYIDX22:%.*]] = getelementptr inbounds i8, ptr [[TMP1]], i64 2
; CHECK-NEXT: ret ptr [[ARRAYIDX22]]
;
%ptradd = getelementptr nuw inbounds i8, ptr %p, i32 1
%i.prom = zext i32 %i to i64
%idx2 = add i64 %i.prom, 1
%arrayidx2 = getelementptr nuw inbounds i8, ptr %ptradd, i64 %idx2
ret ptr %arrayidx2
}
; GEPs with nuw flag. Negative offsets.
define ptr @test_6(ptr %p, i64 %i) {
; CHECK-LABEL: define ptr @test_6(
; CHECK-SAME: ptr [[P:%.*]], i64 [[I:%.*]]) {
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr nuw i8, ptr [[P]], i64 [[I]]
; CHECK-NEXT: [[ARRAYIDX22:%.*]] = getelementptr nuw i8, ptr [[TMP1]], i64 -11
; CHECK-NEXT: ret ptr [[ARRAYIDX22]]
;
%ptradd = getelementptr nuw nusw i8, ptr %p, i32 -1
%idx2 = add nuw i64 %i, -10
%arrayidx2 = getelementptr nuw i8, ptr %ptradd, i64 %idx2
ret ptr %arrayidx2
}
; GEPs with nuw and nusw flags. Negative offsets.
define ptr @test_7(ptr %p, i64 %i) {
; CHECK-LABEL: define ptr @test_7(
; CHECK-SAME: ptr [[P:%.*]], i64 [[I:%.*]]) {
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr nusw nuw i8, ptr [[P]], i64 [[I]]
; CHECK-NEXT: [[ARRAYIDX22:%.*]] = getelementptr nusw nuw i8, ptr [[TMP1]], i64 -11
; CHECK-NEXT: ret ptr [[ARRAYIDX22]]
;
%ptradd = getelementptr nuw inbounds i8, ptr %p, i32 -1
%idx2 = add nuw i64 %i, -10
%arrayidx2 = getelementptr nuw nusw i8, ptr %ptradd, i64 %idx2
ret ptr %arrayidx2
}
; GEPs with nuw flag. Mixed positive/negative offsets.
define ptr @test_8(ptr %p, i64 %i) {
; CHECK-LABEL: define ptr @test_8(
; CHECK-SAME: ptr [[P:%.*]], i64 [[I:%.*]]) {
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr nuw i8, ptr [[P]], i64 [[I]]
; CHECK-NEXT: [[ARRAYIDX22:%.*]] = getelementptr nuw i8, ptr [[TMP1]], i64 -9
; CHECK-NEXT: ret ptr [[ARRAYIDX22]]
;
%ptradd = getelementptr nuw i8, ptr %p, i32 1
%idx2 = add nuw i64 %i, -10
%arrayidx2 = getelementptr nuw nusw i8, ptr %ptradd, i64 %idx2
ret ptr %arrayidx2
}
; GEPs with nuw and nusw flags. Mixed positive/negative offsets.
define ptr @test_9(ptr %p, i64 %i) {
; CHECK-LABEL: define ptr @test_9(
; CHECK-SAME: ptr [[P:%.*]], i64 [[I:%.*]]) {
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr nusw nuw i8, ptr [[P]], i64 [[I]]
; CHECK-NEXT: [[ARRAYIDX22:%.*]] = getelementptr nusw nuw i8, ptr [[TMP1]], i64 -9
; CHECK-NEXT: ret ptr [[ARRAYIDX22]]
;
%ptradd = getelementptr nuw inbounds i8, ptr %p, i32 1
%idx2 = add nuw i64 %i, -10
%arrayidx2 = getelementptr nuw nusw i8, ptr %ptradd, i64 %idx2
ret ptr %arrayidx2
}
; GEPs with nuw flag. Mixed negative/positive offsets.
define ptr @test_10(ptr %p, i64 %i) {
; CHECK-LABEL: define ptr @test_10(
; CHECK-SAME: ptr [[P:%.*]], i64 [[I:%.*]]) {
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr nuw i8, ptr [[P]], i64 [[I]]
; CHECK-NEXT: [[ARRAYIDX22:%.*]] = getelementptr nuw i8, ptr [[TMP1]], i64 9
; CHECK-NEXT: ret ptr [[ARRAYIDX22]]
;
%ptradd = getelementptr nuw i8, ptr %p, i32 -1
%idx2 = add nuw i64 %i, 10
%arrayidx2 = getelementptr nuw nusw i8, ptr %ptradd, i64 %idx2
ret ptr %arrayidx2
}
; GEPs with nuw and nusw flags. Mixed negative/positive offsets.
define ptr @test_11(ptr %p, i64 %i) {
; CHECK-LABEL: define ptr @test_11(
; CHECK-SAME: ptr [[P:%.*]], i64 [[I:%.*]]) {
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr nusw nuw i8, ptr [[P]], i64 [[I]]
; CHECK-NEXT: [[ARRAYIDX22:%.*]] = getelementptr nusw nuw i8, ptr [[TMP1]], i64 9
; CHECK-NEXT: ret ptr [[ARRAYIDX22]]
;
%ptradd = getelementptr nuw inbounds i8, ptr %p, i32 -1
%idx2 = add nuw i64 %i, 10
%arrayidx2 = getelementptr nuw nusw i8, ptr %ptradd, i64 %idx2
ret ptr %arrayidx2
}
; GEPs with nuw flag. All positive offsets.
define ptr @test_12(ptr %p, i64 %i) {
; CHECK-LABEL: define ptr @test_12(
; CHECK-SAME: ptr [[P:%.*]], i64 [[I:%.*]]) {
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr nuw i8, ptr [[P]], i64 [[I]]
; CHECK-NEXT: [[ARRAYIDX22:%.*]] = getelementptr nuw i8, ptr [[TMP1]], i64 2
; CHECK-NEXT: ret ptr [[ARRAYIDX22]]
;
%ptradd = getelementptr nuw nusw i8, ptr %p, i32 1
%idx2 = add nuw i64 %i, 1
%arrayidx2 = getelementptr nuw i8, ptr %ptradd, i64 %idx2
ret ptr %arrayidx2
}
; GEPs with nuw and nusw flags. All positive offsets.
define ptr @test_13(ptr %p, i64 %i) {
; CHECK-LABEL: define ptr @test_13(
; CHECK-SAME: ptr [[P:%.*]], i64 [[I:%.*]]) {
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr nusw nuw i8, ptr [[P]], i64 [[I]]
; CHECK-NEXT: [[ARRAYIDX22:%.*]] = getelementptr nusw nuw i8, ptr [[TMP1]], i64 2
; CHECK-NEXT: ret ptr [[ARRAYIDX22]]
;
%ptradd = getelementptr nuw inbounds i8, ptr %p, i32 1
%idx2 = add nuw i64 %i, 1
%arrayidx2 = getelementptr nuw nusw i8, ptr %ptradd, i64 %idx2
ret ptr %arrayidx2
}
; GEPs with nuw flag. Zext index with negative offsets.
define ptr @test_14(ptr %p, i32 %i) {
; CHECK-LABEL: define ptr @test_14(
; CHECK-SAME: ptr [[P:%.*]], i32 [[I:%.*]]) {
; CHECK-NEXT: [[I_PROM:%.*]] = zext i32 [[I]] to i64
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr nuw i8, ptr [[P]], i64 [[I_PROM]]
; CHECK-NEXT: [[ARRAYIDX22:%.*]] = getelementptr nuw i8, ptr [[TMP1]], i64 -11
; CHECK-NEXT: ret ptr [[ARRAYIDX22]]
;
%ptradd = getelementptr nuw nusw i8, ptr %p, i32 -1
%i.prom = zext i32 %i to i64
%idx2 = add nuw i64 %i.prom, -10
%arrayidx2 = getelementptr nuw i8, ptr %ptradd, i64 %idx2
ret ptr %arrayidx2
}
; GEPs with nuw and nusw flags. Zext index with negative offsets.
define ptr @test_15(ptr %p, i32 %i) {
; CHECK-LABEL: define ptr @test_15(
; CHECK-SAME: ptr [[P:%.*]], i32 [[I:%.*]]) {
; CHECK-NEXT: [[I_PROM:%.*]] = zext i32 [[I]] to i64
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr nusw nuw i8, ptr [[P]], i64 [[I_PROM]]
; CHECK-NEXT: [[ARRAYIDX22:%.*]] = getelementptr nusw nuw i8, ptr [[TMP1]], i64 -11
; CHECK-NEXT: ret ptr [[ARRAYIDX22]]
;
%ptradd = getelementptr nuw nusw i8, ptr %p, i32 -1
%i.prom = zext i32 %i to i64
%idx2 = add nuw i64 %i.prom, -10
%arrayidx2 = getelementptr nuw inbounds i8, ptr %ptradd, i64 %idx2
ret ptr %arrayidx2
}
; GEPs with nuw flag. Zext index with mixed positive/negative offsets.
define ptr @test_16(ptr %p, i32 %i) {
; CHECK-LABEL: define ptr @test_16(
; CHECK-SAME: ptr [[P:%.*]], i32 [[I:%.*]]) {
; CHECK-NEXT: [[I_PROM:%.*]] = zext i32 [[I]] to i64
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr nuw i8, ptr [[P]], i64 [[I_PROM]]
; CHECK-NEXT: [[ARRAYIDX22:%.*]] = getelementptr nuw i8, ptr [[TMP1]], i64 -9
; CHECK-NEXT: ret ptr [[ARRAYIDX22]]
;
%ptradd = getelementptr nuw i8, ptr %p, i32 1
%i.prom = zext i32 %i to i64
%idx2 = add nuw i64 %i.prom, -10
%arrayidx2 = getelementptr nuw nusw i8, ptr %ptradd, i64 %idx2
ret ptr %arrayidx2
}
; GEPs with nuw and nusw flags. Zext index with mixed positive/negative offsets.
define ptr @test_17(ptr %p, i32 %i) {
; CHECK-LABEL: define ptr @test_17(
; CHECK-SAME: ptr [[P:%.*]], i32 [[I:%.*]]) {
; CHECK-NEXT: [[I_PROM:%.*]] = zext i32 [[I]] to i64
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr nusw nuw i8, ptr [[P]], i64 [[I_PROM]]
; CHECK-NEXT: [[ARRAYIDX22:%.*]] = getelementptr nusw nuw i8, ptr [[TMP1]], i64 -9
; CHECK-NEXT: ret ptr [[ARRAYIDX22]]
;
%ptradd = getelementptr nuw nusw i8, ptr %p, i32 1
%i.prom = zext i32 %i to i64
%idx2 = add nuw i64 %i.prom, -10
%arrayidx2 = getelementptr nuw inbounds i8, ptr %ptradd, i64 %idx2
ret ptr %arrayidx2
}
; GEPs with nuw flag. Zext index with mixed negative/positive offsets.
define ptr @test_18(ptr %p, i32 %i) {
; CHECK-LABEL: define ptr @test_18(
; CHECK-SAME: ptr [[P:%.*]], i32 [[I:%.*]]) {
; CHECK-NEXT: [[I_PROM:%.*]] = zext i32 [[I]] to i64
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr nuw i8, ptr [[P]], i64 [[I_PROM]]
; CHECK-NEXT: [[ARRAYIDX22:%.*]] = getelementptr nuw i8, ptr [[TMP1]], i64 9
; CHECK-NEXT: ret ptr [[ARRAYIDX22]]
;
%ptradd = getelementptr nuw nusw i8, ptr %p, i32 -1
%i.prom = zext i32 %i to i64
%idx2 = add nuw i64 %i.prom, 10
%arrayidx2 = getelementptr nuw i8, ptr %ptradd, i64 %idx2
ret ptr %arrayidx2
}
; GEPs with nuw and nusw flags. Zext index with mixed negative/positive offsets.
define ptr @test_19(ptr %p, i32 %i) {
; CHECK-LABEL: define ptr @test_19(
; CHECK-SAME: ptr [[P:%.*]], i32 [[I:%.*]]) {
; CHECK-NEXT: [[I_PROM:%.*]] = zext i32 [[I]] to i64
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr nusw nuw i8, ptr [[P]], i64 [[I_PROM]]
; CHECK-NEXT: [[ARRAYIDX22:%.*]] = getelementptr nusw nuw i8, ptr [[TMP1]], i64 9
; CHECK-NEXT: ret ptr [[ARRAYIDX22]]
;
%ptradd = getelementptr nuw nusw i8, ptr %p, i32 -1
%i.prom = zext i32 %i to i64
%idx2 = add nuw i64 %i.prom, 10
%arrayidx2 = getelementptr nuw inbounds i8, ptr %ptradd, i64 %idx2
ret ptr %arrayidx2
}
; GEPs with nuw flag. Zext index with all positive offsets.
define ptr @test_20(ptr %p, i32 %i) {
; CHECK-LABEL: define ptr @test_20(
; CHECK-SAME: ptr [[P:%.*]], i32 [[I:%.*]]) {
; CHECK-NEXT: [[I_PROM:%.*]] = zext i32 [[I]] to i64
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr nuw i8, ptr [[P]], i64 [[I_PROM]]
; CHECK-NEXT: [[ARRAYIDX22:%.*]] = getelementptr nuw i8, ptr [[TMP1]], i64 2
; CHECK-NEXT: ret ptr [[ARRAYIDX22]]
;
%ptradd = getelementptr nuw i8, ptr %p, i32 1
%i.prom = zext i32 %i to i64
%idx2 = add nuw i64 %i.prom, 1
%arrayidx2 = getelementptr nuw nusw i8, ptr %ptradd, i64 %idx2
ret ptr %arrayidx2
}
; GEPs with nuw and nusw flags. Zext index with all positive offsets.
define ptr @test_21(ptr %p, i32 %i) {
; CHECK-LABEL: define ptr @test_21(
; CHECK-SAME: ptr [[P:%.*]], i32 [[I:%.*]]) {
; CHECK-NEXT: [[I_PROM:%.*]] = zext i32 [[I]] to i64
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr nusw nuw i8, ptr [[P]], i64 [[I_PROM]]
; CHECK-NEXT: [[ARRAYIDX22:%.*]] = getelementptr nusw nuw i8, ptr [[TMP1]], i64 2
; CHECK-NEXT: ret ptr [[ARRAYIDX22]]
;
%ptradd = getelementptr nuw inbounds i8, ptr %p, i32 1
%i.prom = zext i32 %i to i64
%idx2 = add nuw i64 %i.prom, 1
%arrayidx2 = getelementptr nuw nusw i8, ptr %ptradd, i64 %idx2
ret ptr %arrayidx2
}
define ptr @test_rpot(ptr %ptr, i64 %offset1, i64 %offset2) {
; CHECK-LABEL: define ptr @test_rpot(
; CHECK-SAME: ptr [[PTR:%.*]], i64 [[OFFSET1:%.*]], i64 [[OFFSET2:%.*]]) {
; CHECK-NEXT: [[A:.*:]]
; CHECK-NEXT: br label %[[B:.*]]
; CHECK: [[C:.*]]:
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr [[STRUCT_UCHAR4:%.*]], ptr [[TMP0:%.*]], i64 [[OFFSET2]]
; CHECK-NEXT: [[GEP24:%.*]] = getelementptr i8, ptr [[TMP1]], i64 72
; CHECK-NEXT: br label %[[D:.*]]
; CHECK: [[B]]:
; CHECK-NEXT: [[TMP0]] = getelementptr [[STRUCT_UCHAR4]], ptr [[PTR]], i64 [[OFFSET1]]
; CHECK-NEXT: br label %[[C]]
; CHECK: [[D]]:
; CHECK-NEXT: ret ptr [[GEP24]]
;
A:
br label %B
C:
%offset4 = add i64 %offset2, 10
%gep2 = getelementptr %struct.uchar4, ptr %gep1, i64 %offset4
br label %D
B:
%offset3 = add i64 %offset1, 8
%gep1 = getelementptr %struct.uchar4, ptr %ptr, i64 %offset3
br label %C
D:
ret ptr %gep2
}