[clang] 5f01a62 - [ConstantFold] Fix inbounds inference on mismatching source element type
Nikita Popov via cfe-commits
cfe-commits at lists.llvm.org
Tue Jan 31 02:33:45 PST 2023
Author: Nikita Popov
Date: 2023-01-31T11:33:00+01:00
New Revision: 5f01a626dd0615df49773d419c75aeb33666ee83
URL: https://github.com/llvm/llvm-project/commit/5f01a626dd0615df49773d419c75aeb33666ee83
DIFF: https://github.com/llvm/llvm-project/commit/5f01a626dd0615df49773d419c75aeb33666ee83.diff
LOG: [ConstantFold] Fix inbounds inference on mismatching source element type
When inferring that a GEP of a global variable is inbounds because
there is no notional overindexing, we need to check that the
global value type and the GEP source element type match.
This was not necessary with typed pointers (because we would have
a bitcast in between), but is necessary with opaque pointers.
We should be able to recover some of the safe cases by performing
an offset based inbounds inference in DL-aware ConstantFolding.
Added:
Modified:
clang/test/CodeGenCXX/no-unique-address.cpp
llvm/lib/IR/ConstantFold.cpp
llvm/test/Assembler/opaque-ptr.ll
llvm/test/Transforms/InferAddressSpaces/AMDGPU/infer-getelementptr.ll
llvm/test/Transforms/InstCombine/getelementptr.ll
llvm/test/Transforms/InstCombine/memchr-9.ll
llvm/test/Transforms/InstCombine/wcslen-1.ll
llvm/test/Transforms/InstSimplify/compare.ll
Removed:
################################################################################
diff --git a/clang/test/CodeGenCXX/no-unique-address.cpp b/clang/test/CodeGenCXX/no-unique-address.cpp
index aa58b87555dcc..7b4bbbf2a05d5 100644
--- a/clang/test/CodeGenCXX/no-unique-address.cpp
+++ b/clang/test/CodeGenCXX/no-unique-address.cpp
@@ -64,7 +64,7 @@ FieldOverlap fo = {{}, {}, {}, {}, 1234};
// CHECK-DAG: @e1 ={{.*}} constant ptr @fo
Empty1 &e1 = fo.e1;
-// CHECK-DAG: @e2 ={{.*}} constant ptr getelementptr inbounds (i8, ptr @fo, i64 1)
+// CHECK-DAG: @e2 ={{.*}} constant ptr getelementptr (i8, ptr @fo, i64 1)
Empty1 &e2 = fo.e2;
// CHECK-LABEL: accessE1
diff --git a/llvm/lib/IR/ConstantFold.cpp b/llvm/lib/IR/ConstantFold.cpp
index f84fe79b21be2..5fa56d30910e4 100644
--- a/llvm/lib/IR/ConstantFold.cpp
+++ b/llvm/lib/IR/ConstantFold.cpp
@@ -2280,7 +2280,8 @@ Constant *llvm::ConstantFoldGetElementPtr(Type *PointeeTy, Constant *C,
// check for the "inbounds" property.
if (!Unknown && !InBounds)
if (auto *GV = dyn_cast<GlobalVariable>(C))
- if (!GV->hasExternalWeakLinkage() && isInBoundsIndices(Idxs))
+ if (!GV->hasExternalWeakLinkage() && GV->getValueType() == PointeeTy &&
+ isInBoundsIndices(Idxs))
return ConstantExpr::getGetElementPtr(PointeeTy, C, Idxs,
/*InBounds=*/true, InRangeIndex);
diff --git a/llvm/test/Assembler/opaque-ptr.ll b/llvm/test/Assembler/opaque-ptr.ll
index f950708088f1a..e9e1496756888 100644
--- a/llvm/test/Assembler/opaque-ptr.ll
+++ b/llvm/test/Assembler/opaque-ptr.ll
@@ -4,7 +4,7 @@
; CHECK: @global = external global ptr
@global = external global ptr
-; CHECK: @global_const_gep = global ptr getelementptr inbounds (i47, ptr @global, i64 1)
+; CHECK: @global_const_gep = global ptr getelementptr (i47, ptr @global, i64 1)
@global_const_gep = global ptr getelementptr (i47, ptr @global, i64 1)
; CHECK: @fptr1 = external global ptr
diff --git a/llvm/test/Transforms/InferAddressSpaces/AMDGPU/infer-getelementptr.ll b/llvm/test/Transforms/InferAddressSpaces/AMDGPU/infer-getelementptr.ll
index 3c3b5036eaa26..dc36e936fca54 100644
--- a/llvm/test/Transforms/InferAddressSpaces/AMDGPU/infer-getelementptr.ll
+++ b/llvm/test/Transforms/InferAddressSpaces/AMDGPU/infer-getelementptr.ll
@@ -94,7 +94,7 @@ define void @repeated_constexpr_gep_addrspacecast(i64 %idx0, i64 %idx1) {
define void @unorder_constexpr_gep_bitcast() {
; CHECK-LABEL: @unorder_constexpr_gep_bitcast(
; CHECK-NEXT: [[X0:%.*]] = load i32, ptr addrspace(3) @lds, align 4
-; CHECK-NEXT: [[X1:%.*]] = load i32, ptr addrspace(3) getelementptr inbounds (i32, ptr addrspace(3) @lds, i32 1), align 4
+; CHECK-NEXT: [[X1:%.*]] = load i32, ptr addrspace(3) getelementptr (i32, ptr addrspace(3) @lds, i32 1), align 4
; CHECK-NEXT: call void @use(i32 [[X0]], i32 [[X1]])
; CHECK-NEXT: ret void
;
diff --git a/llvm/test/Transforms/InstCombine/getelementptr.ll b/llvm/test/Transforms/InstCombine/getelementptr.ll
index e67f67c24d266..766abb5923407 100644
--- a/llvm/test/Transforms/InstCombine/getelementptr.ll
+++ b/llvm/test/Transforms/InstCombine/getelementptr.ll
@@ -1334,7 +1334,7 @@ define ptr @const_gep_global_di_i8_larger() {
define ptr @const_gep_global_di_i64_larger() {
; CHECK-LABEL: @const_gep_global_di_i64_larger(
-; CHECK-NEXT: ret ptr getelementptr inbounds (i32, ptr @g_i32_di, i64 2)
+; CHECK-NEXT: ret ptr getelementptr (i32, ptr @g_i32_di, i64 2)
;
ret ptr getelementptr (i64, ptr @g_i32_di, i64 1)
}
diff --git a/llvm/test/Transforms/InstCombine/memchr-9.ll b/llvm/test/Transforms/InstCombine/memchr-9.ll
index 00cc90688e2b7..e2c2e6839817c 100644
--- a/llvm/test/Transforms/InstCombine/memchr-9.ll
+++ b/llvm/test/Transforms/InstCombine/memchr-9.ll
@@ -24,9 +24,9 @@ define void @fold_memchr_A_pIb_cst_cst(ptr %pchr) {
; CHECK-NEXT: [[PST_0_4_4:%.*]] = getelementptr ptr, ptr [[PCHR]], i64 2
; CHECK-NEXT: store ptr null, ptr [[PST_0_4_4]], align 8
; CHECK-NEXT: [[PST_1_0_1:%.*]] = getelementptr ptr, ptr [[PCHR]], i64 3
-; CHECK-NEXT: store ptr getelementptr inbounds (i8, ptr @a, i64 1), ptr [[PST_1_0_1]], align 8
+; CHECK-NEXT: store ptr getelementptr (i8, ptr @a, i64 1), ptr [[PST_1_0_1]], align 8
; CHECK-NEXT: [[PST_1_0_3:%.*]] = getelementptr ptr, ptr [[PCHR]], i64 4
-; CHECK-NEXT: store ptr getelementptr inbounds (i8, ptr @a, i64 1), ptr [[PST_1_0_3]], align 8
+; CHECK-NEXT: store ptr getelementptr (i8, ptr @a, i64 1), ptr [[PST_1_0_3]], align 8
; CHECK-NEXT: [[PST_1_1_1:%.*]] = getelementptr ptr, ptr [[PCHR]], i64 5
; CHECK-NEXT: store ptr null, ptr [[PST_1_1_1]], align 8
; CHECK-NEXT: [[PST_1_1_2:%.*]] = getelementptr ptr, ptr [[PCHR]], i64 6
@@ -116,7 +116,7 @@ define void @fold_memchr_A_pIb_cst_N(i64 %N, ptr %pchr) {
; CHECK-NEXT: store ptr null, ptr [[PST_0_4_N]], align 8
; CHECK-NEXT: [[PST_1_0_N:%.*]] = getelementptr ptr, ptr [[PCHR]], i64 3
; CHECK-NEXT: [[MEMCHR_CMP2:%.*]] = icmp eq i64 [[N]], 0
-; CHECK-NEXT: [[CHR_1_0_N:%.*]] = select i1 [[MEMCHR_CMP2]], ptr null, ptr getelementptr inbounds (i8, ptr @a, i64 1)
+; CHECK-NEXT: [[CHR_1_0_N:%.*]] = select i1 [[MEMCHR_CMP2]], ptr null, ptr getelementptr (i8, ptr @a, i64 1)
; CHECK-NEXT: store ptr [[CHR_1_0_N]], ptr [[PST_1_0_N]], align 8
; CHECK-NEXT: [[PST_1_1_N:%.*]] = getelementptr ptr, ptr [[PCHR]], i64 4
; CHECK-NEXT: [[MEMCHR_CMP3:%.*]] = icmp ult i64 [[N]], 2
@@ -297,7 +297,7 @@ define ptr @fold_memchr_gep_gep_gep() {
define ptr @fold_memchr_union_member() {
; BE-CHECK-LABEL: @fold_memchr_union_member(
-; BE-CHECK-NEXT: ret ptr getelementptr inbounds (i8, ptr @u, i64 5)
+; BE-CHECK-NEXT: ret ptr getelementptr (i8, ptr @u, i64 5)
;
; LE-CHECK-LABEL: @fold_memchr_union_member(
; LE-CHECK-NEXT: ret ptr getelementptr inbounds ([[UNION_U:%.*]], ptr @u, i64 0, i32 0, i64 1)
diff --git a/llvm/test/Transforms/InstCombine/wcslen-1.ll b/llvm/test/Transforms/InstCombine/wcslen-1.ll
index 568829542b1f0..5d05cff6e54b8 100644
--- a/llvm/test/Transforms/InstCombine/wcslen-1.ll
+++ b/llvm/test/Transforms/InstCombine/wcslen-1.ll
@@ -231,7 +231,7 @@ define i64 @fold_wcslen_1() {
; with an offset that isn't a multiple of the element size).
define i64 @no_fold_wcslen_1() {
; CHECK-LABEL: @no_fold_wcslen_1(
-; CHECK-NEXT: [[LEN:%.*]] = tail call i64 @wcslen(ptr nonnull getelementptr inbounds ([15 x i8], ptr @ws, i64 0, i64 3))
+; CHECK-NEXT: [[LEN:%.*]] = tail call i64 @wcslen(ptr getelementptr ([15 x i8], ptr @ws, i64 0, i64 3))
; CHECK-NEXT: ret i64 [[LEN]]
;
%p = getelementptr [15 x i8], ptr @ws, i64 0, i64 3
diff --git a/llvm/test/Transforms/InstSimplify/compare.ll b/llvm/test/Transforms/InstSimplify/compare.ll
index 7149d0a725948..7432804f747c4 100644
--- a/llvm/test/Transforms/InstSimplify/compare.ll
+++ b/llvm/test/Transforms/InstSimplify/compare.ll
@@ -2784,7 +2784,7 @@ define i1 @globals_inequal() {
; TODO: Never equal
define i1 @globals_offset_inequal() {
; CHECK-LABEL: @globals_offset_inequal(
-; CHECK-NEXT: ret i1 icmp ne (ptr getelementptr inbounds (i8, ptr @A, i32 1), ptr getelementptr inbounds (i8, ptr @B, i32 1))
+; CHECK-NEXT: ret i1 icmp ne (ptr getelementptr (i8, ptr @A, i32 1), ptr getelementptr (i8, ptr @B, i32 1))
;
%a.off = getelementptr i8, ptr @A, i32 1
%b.off = getelementptr i8, ptr @B, i32 1
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