556ff19db9
In order to help LLVM disambiguate accesses to the COMMON
block variables, this patch creates a TBAA sub-tree for each
COMMON block, and the places all variables belonging to this
COMMON block into this sub-tree. The structure looks like this:
```
common /blk/ a, b, c
"global data"
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|- "blk_"
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|- "blk_/bytes_0_to_3"
|- "blk_/bytes_4_to_7"
|- "blk_/bytes_8_to_11"
```
The TBAA tag for "a" is created in "blk_/bytes_0_to_3" root, etc.
The byte spans are created based on the `storage` information
provided by `fir.declare` (#155742).
See also:
https://discourse.llvm.org/t/rfc-flang-representation-for-objects-inside-physical-storage/88026
26 lines
1.5 KiB
Plaintext
26 lines
1.5 KiB
Plaintext
// Check that -local-alloc-tbaa-threshold option limits
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// the attachment of TBAA tags to accesses of locally allocated entities.
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// RUN: fir-opt --fir-add-alias-tags -local-alloc-tbaa-threshold=2 %s | FileCheck %s --check-prefixes=ALL,COUNT2
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// RUN: fir-opt --fir-add-alias-tags -local-alloc-tbaa-threshold=1 %s | FileCheck %s --check-prefixes=ALL,COUNT1
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// RUN: fir-opt --fir-add-alias-tags -local-alloc-tbaa-threshold=0 %s | FileCheck %s --check-prefixes=ALL,COUNT0
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// ALL-LABEL: func.func @_QPtest() {
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// COUNT2: fir.load{{.*}}{tbaa =
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// COUNT2: fir.store{{.*}}{tbaa =
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// COUNT1: fir.load{{.*}}{tbaa =
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// COUNT1-NOT: fir.store{{.*}}{tbaa =
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// COUNT0-NOT: fir.load{{.*}}{tbaa =
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// COUNT0-NOT: fir.store{{.*}}{tbaa =
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module attributes {dlti.dl_spec = #dlti.dl_spec<!llvm.ptr = dense<64> : vector<4xi64>, i1 = dense<8> : vector<2xi64>, i8 = dense<8> : vector<2xi64>, i16 = dense<16> : vector<2xi64>, i32 = dense<32> : vector<2xi64>, i64 = dense<[32, 64]> : vector<2xi64>, f16 = dense<16> : vector<2xi64>, f64 = dense<64> : vector<2xi64>, f128 = dense<128> : vector<2xi64>, "dlti.endianness" = "little">, llvm.data_layout = ""} {
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func.func @_QPtest() {
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%0 = fir.dummy_scope : !fir.dscope
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%1 = fir.alloca f32 {bindc_name = "x", uniq_name = "_QFtestEx"}
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%2 = fir.declare %1 {uniq_name = "_QFtestEx"} : (!fir.ref<f32>) -> !fir.ref<f32>
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%3 = fir.alloca f32 {bindc_name = "y", uniq_name = "_QFtestEy"}
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%4 = fir.declare %3 {uniq_name = "_QFtestEy"} : (!fir.ref<f32>) -> !fir.ref<f32>
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%5 = fir.load %4 : !fir.ref<f32>
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fir.store %5 to %2 : !fir.ref<f32>
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return
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}
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}
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