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DominikAdamskiDominikAdamski
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Revert "[Flang] Turn on alias analysis for locally allocated objects" (#140202)
Reverts #139682 (commit: cf16c97 ) due to reported regression in Fujitsu Fortran test suite: https://ci.linaro.org/job/tcwg_flang_test--main-aarch64-Ofast-sve_vla-build/2081/artifact/artifacts/notify/mail-body.txt/*view*/
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5 files changed

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‎flang/lib/Optimizer/Transforms/AddAliasTags.cpp‎

Lines changed: 7 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -43,10 +43,13 @@ static llvm::cl::opt<bool>
4343
static llvm::cl::opt<bool>
4444
enableDirect("direct-tbaa", llvm::cl::init(true), llvm::cl::Hidden,
4545
llvm::cl::desc("Add TBAA tags to direct variables"));
46-
static llvm::cl::opt<bool>
47-
enableLocalAllocs("local-alloc-tbaa", llvm::cl::init(true),
48-
llvm::cl::Hidden,
49-
llvm::cl::desc("Add TBAA tags to local allocations."));
46+
// This is **known unsafe** (misscompare in spec2017/wrf_r). It should
47+
// not be enabled by default.
48+
// The code is kept so that these may be tried with new benchmarks to see if
49+
// this is worth fixing in the future.
50+
static llvm::cl::opt<bool> enableLocalAllocs(
51+
"local-alloc-tbaa", llvm::cl::init(false), llvm::cl::Hidden,
52+
llvm::cl::desc("Add TBAA tags to local allocations. UNSAFE."));
5053

5154
namespace {
5255

‎flang/test/Fir/tbaa-codegen2.fir‎

Lines changed: 2 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -100,7 +100,7 @@ module attributes {fir.defaultkind = "a1c4d8i4l4r4", fir.kindmap = "", llvm.targ
100100
// [...]
101101
// CHECK: %[[VAL50:.*]] = getelementptr i32, ptr %{{.*}}, i64 %{{.*}}
102102
// store to the temporary:
103-
// CHECK: store i32 %{{.*}}, ptr %[[VAL50]], align 4, !tbaa ![[TMP_DATA_ACCESS_TAG:.*]]
103+
// CHECK: store i32 %{{.*}}, ptr %[[VAL50]], align 4, !tbaa ![[DATA_ACCESS_TAG:.*]]
104104
// [...]
105105

106106
// CHECK: [[BOX_ACCESS_TAG]] = !{![[BOX_ACCESS_TYPE:.*]], ![[BOX_ACCESS_TYPE]], i64 0}
@@ -111,7 +111,4 @@ module attributes {fir.defaultkind = "a1c4d8i4l4r4", fir.kindmap = "", llvm.targ
111111
// CHECK: ![[A_ACCESS_TYPE]] = !{!"dummy arg data/_QFfuncEa", ![[ARG_ACCESS_TYPE:.*]], i64 0}
112112
// CHECK: ![[ARG_ACCESS_TYPE]] = !{!"dummy arg data", ![[DATA_ACCESS_TYPE:.*]], i64 0}
113113
// CHECK: ![[DATA_ACCESS_TYPE]] = !{!"any data access", ![[ANY_ACCESS_TYPE]], i64 0}
114-
// CHECK: ![[TMP_DATA_ACCESS_TAG]] = !{![[TMP_DATA_ACCESS_TYPE:.*]], ![[TMP_DATA_ACCESS_TYPE]], i64 0}
115-
// CHECK: ![[TMP_DATA_ACCESS_TYPE]] = !{!"allocated data/", ![[TMP_ACCESS_TYPE:.*]], i64 0}
116-
// CHECK: ![[TMP_ACCESS_TYPE]] = !{!"allocated data", ![[TARGET_ACCESS_TAG:.*]], i64 0}
117-
// CHECK: ![[TARGET_ACCESS_TAG]] = !{!"target data", ![[DATA_ACCESS_TYPE]], i64 0}
114+
// CHECK: ![[DATA_ACCESS_TAG]] = !{![[DATA_ACCESS_TYPE]], ![[DATA_ACCESS_TYPE]], i64 0}

‎flang/test/Transforms/tbaa-with-dummy-scope2.fir‎

Lines changed: 8 additions & 15 deletions
Original file line numberDiff line numberDiff line change
@@ -43,15 +43,12 @@ func.func @_QPtest1() attributes {noinline} {
4343
// CHECK: #[[$ATTR_0:.+]] = #llvm.tbaa_root<id = "Flang function root _QPtest1">
4444
// CHECK: #[[$ATTR_1:.+]] = #llvm.tbaa_type_desc<id = "any access", members = {<#[[$ATTR_0]], 0>}>
4545
// CHECK: #[[$ATTR_2:.+]] = #llvm.tbaa_type_desc<id = "any data access", members = {<#[[$ATTR_1]], 0>}>
46-
// CHECK: #[[$TARGETDATA:.+]] = #llvm.tbaa_type_desc<id = "target data", members = {<#[[$ATTR_2]], 0>}>
4746
// CHECK: #[[$ATTR_3:.+]] = #llvm.tbaa_type_desc<id = "dummy arg data", members = {<#[[$ATTR_2]], 0>}>
48-
// CHECK: #[[$LOCAL_ATTR_0:.+]] = #llvm.tbaa_type_desc<id = "allocated data", members = {<#[[$TARGETDATA]], 0>}>
47+
// CHECK: #[[TARGETDATA:.+]] = #llvm.tbaa_type_desc<id = "target data", members = {<#[[$ATTR_2]], 0>}>
4948
// CHECK: #[[$ATTR_5:.+]] = #llvm.tbaa_type_desc<id = "dummy arg data/_QFtest1FinnerEx", members = {<#[[$ATTR_3]], 0>}>
50-
// CHECK: #[[$ATTR_4:.+]] = #llvm.tbaa_type_desc<id = "global data", members = {<#[[$TARGETDATA]], 0>}>
49+
// CHECK: #[[$ATTR_4:.+]] = #llvm.tbaa_type_desc<id = "global data", members = {<#[[TARGETDATA]], 0>}>
5150
// CHECK: #[[$ATTR_7:.+]] = #llvm.tbaa_tag<base_type = #[[$ATTR_5]], access_type = #[[$ATTR_5]], offset = 0>
52-
// CHECK: #[[$LOCAL_ATTR_1:.+]] = #llvm.tbaa_type_desc<id = "allocated data/_QFtest1FinnerEy", members = {<#[[$LOCAL_ATTR_0]], 0>}>
5351
// CHECK: #[[$ATTR_6:.+]] = #llvm.tbaa_type_desc<id = "global data/_QMmEglob", members = {<#[[$ATTR_4]], 0>}>
54-
// CHECK: #[[$LOCAL_ATTR_2:.+]] = #llvm.tbaa_tag<base_type = #[[$LOCAL_ATTR_1]], access_type = #[[$LOCAL_ATTR_1]], offset = 0>
5552
// CHECK: #[[$ATTR_8:.+]] = #llvm.tbaa_tag<base_type = #[[$ATTR_6]], access_type = #[[$ATTR_6]], offset = 0>
5653
// CHECK-LABEL: func.func @_QPtest1() attributes {noinline} {
5754
// CHECK: %[[VAL_2:.*]] = fir.alloca i32 {bindc_name = "y", uniq_name = "_QFtest1FinnerEy"}
@@ -60,8 +57,8 @@ func.func @_QPtest1() attributes {noinline} {
6057
// CHECK: %[[VAL_5:.*]] = fir.dummy_scope : !fir.dscope
6158
// CHECK: %[[VAL_6:.*]] = fir.declare %[[VAL_4]] dummy_scope %[[VAL_5]] {uniq_name = "_QFtest1FinnerEx"} : (!fir.ref<i32>, !fir.dscope) -> !fir.ref<i32>
6259
// CHECK: %[[VAL_7:.*]] = fir.declare %[[VAL_2]] {uniq_name = "_QFtest1FinnerEy"} : (!fir.ref<i32>) -> !fir.ref<i32>
63-
// CHECK: fir.store %{{.*}} to %[[VAL_7]] {tbaa = [#[[$LOCAL_ATTR_2]]]} : !fir.ref<i32>
64-
// CHECK: %[[VAL_8:.*]] = fir.load %[[VAL_7]] {tbaa = [#[[$LOCAL_ATTR_2]]]} : !fir.ref<i32>
60+
// CHECK: fir.store %{{.*}} to %[[VAL_7]] : !fir.ref<i32>
61+
// CHECK: %[[VAL_8:.*]] = fir.load %[[VAL_7]] : !fir.ref<i32>
6562
// CHECK: fir.store %[[VAL_8]] to %[[VAL_6]] {tbaa = [#[[$ATTR_7]]]} : !fir.ref<i32>
6663
// CHECK: fir.store %{{.*}} to %[[VAL_4]] {tbaa = [#[[$ATTR_8]]]} : !fir.ref<i32>
6764

@@ -90,16 +87,12 @@ func.func @_QPtest2() attributes {noinline} {
9087
// CHECK: #[[$ATTR_3:.+]] = #llvm.tbaa_type_desc<id = "any access", members = {<#[[$ATTR_1]], 0>}>
9188
// CHECK: #[[$ATTR_4:.+]] = #llvm.tbaa_type_desc<id = "any data access", members = {<#[[$ATTR_2]], 0>}>
9289
// CHECK: #[[$ATTR_5:.+]] = #llvm.tbaa_type_desc<id = "any data access", members = {<#[[$ATTR_3]], 0>}>
93-
// CHECK: #[[$TARGETDATA_0:.+]] = #llvm.tbaa_type_desc<id = "target data", members = {<#[[$ATTR_4]], 0>}>
9490
// CHECK: #[[$ATTR_6:.+]] = #llvm.tbaa_type_desc<id = "dummy arg data", members = {<#[[$ATTR_4]], 0>}>
95-
// CHECK: #[[$TARGETDATA_1:.+]] = #llvm.tbaa_type_desc<id = "target data", members = {<#[[$ATTR_5]], 0>}>
96-
// CHECK: #[[$LOCAL_ATTR_0:.+]] = #llvm.tbaa_type_desc<id = "allocated data", members = {<#[[$TARGETDATA_0]], 0>}>
91+
// CHECK: #[[TARGETDATA:.+]] = #llvm.tbaa_type_desc<id = "target data", members = {<#[[$ATTR_5]], 0>}>
9792
// CHECK: #[[$ATTR_8:.+]] = #llvm.tbaa_type_desc<id = "dummy arg data/_QFtest2FinnerEx", members = {<#[[$ATTR_6]], 0>}>
98-
// CHECK: #[[$ATTR_7:.+]] = #llvm.tbaa_type_desc<id = "global data", members = {<#[[$TARGETDATA_1]], 0>}>
93+
// CHECK: #[[$ATTR_7:.+]] = #llvm.tbaa_type_desc<id = "global data", members = {<#[[TARGETDATA]], 0>}>
9994
// CHECK: #[[$ATTR_10:.+]] = #llvm.tbaa_tag<base_type = #[[$ATTR_8]], access_type = #[[$ATTR_8]], offset = 0>
100-
// CHECK: #[[$LOCAL_ATTR_1:.+]] = #llvm.tbaa_type_desc<id = "allocated data/_QFtest2FinnerEy", members = {<#[[$LOCAL_ATTR_0]], 0>}>
10195
// CHECK: #[[$ATTR_9:.+]] = #llvm.tbaa_type_desc<id = "global data/_QMmEglob", members = {<#[[$ATTR_7]], 0>}>
102-
// CHECK: #[[$LOCAL_ATTR_2:.+]] = #llvm.tbaa_tag<base_type = #[[$LOCAL_ATTR_1]], access_type = #[[$LOCAL_ATTR_1]], offset = 0>
10396
// CHECK: #[[$ATTR_11:.+]] = #llvm.tbaa_tag<base_type = #[[$ATTR_9]], access_type = #[[$ATTR_9]], offset = 0>
10497
// CHECK-LABEL: func.func @_QPtest2() attributes {noinline} {
10598
// CHECK: %[[VAL_2:.*]] = fir.alloca i32 {bindc_name = "y", uniq_name = "_QFtest2FinnerEy"}
@@ -109,7 +102,7 @@ func.func @_QPtest2() attributes {noinline} {
109102
// CHECK: %[[VAL_6:.*]] = fir.dummy_scope : !fir.dscope
110103
// CHECK: %[[VAL_7:.*]] = fir.declare %[[VAL_5]] dummy_scope %[[VAL_6]] {uniq_name = "_QFtest2FinnerEx"} : (!fir.ref<i32>, !fir.dscope) -> !fir.ref<i32>
111104
// CHECK: %[[VAL_8:.*]] = fir.declare %[[VAL_2]] {uniq_name = "_QFtest2FinnerEy"} : (!fir.ref<i32>) -> !fir.ref<i32>
112-
// CHECK: fir.store %{{.*}} to %[[VAL_8]] {tbaa = [#[[$LOCAL_ATTR_2]]]} : !fir.ref<i32>
113-
// CHECK: %[[VAL_9:.*]] = fir.load %[[VAL_8]] {tbaa = [#[[$LOCAL_ATTR_2]]]} : !fir.ref<i32>
105+
// CHECK: fir.store %{{.*}} to %[[VAL_8]] : !fir.ref<i32>
106+
// CHECK: %[[VAL_9:.*]] = fir.load %[[VAL_8]] : !fir.ref<i32>
114107
// CHECK: fir.store %[[VAL_9]] to %[[VAL_7]] {tbaa = [#[[$ATTR_10]]]} : !fir.ref<i32>
115108
// CHECK: fir.store %{{.*}} to %[[VAL_5]] {tbaa = [#[[$ATTR_11]]]} : !fir.ref<i32>

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