[clang] [TBAA] Emit int TBAA metadata on FP math libcall expf (PR #96025)

[Zahira Ammarguellat via cfe-commits]

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@@ -0,0 +1,43 @@
+// NOTE: Assertions have been autogenerated by utils/update_cc_test_checks.py UTC_ARGS: --version 5
+// The test may fail as time out on windows
+// REQUIRES: system-linux
+
+// RUN:  %clang -S -O3 -emit-llvm -o - -x c++ %s | FileCheck %s -check-prefixes=CHECK,NoNewStructPathTBAA
+// RUN:  %clang -S -O3 -Xclang -new-struct-path-tbaa -emit-llvm -o - -x c++ %s | FileCheck %s -check-prefixes=CHECK,NewStructPathTBAA
+
----------------
zahiraam wrote:

@vfdff I have uploaded your patch and ran the LIT test on windows. It's failing mostly because the //CHECK lines you have in your LIT test are Linux's output. What you are interested by is the tbaa metada at the call of `expf` right? So it's enough to just put that check line.
This test is passing for me on Windows (**I didn't test it on Linu**x. Can you do that?):
`// RUN:  %clang_cc1 -fmath-errno -O3 -emit-llvm -o - -x c++ %s | FileCheck %s -check-prefixes=CHECK,NoNewStructPathTBAA`
`// RUN:  %clang_cc1 -fmath-errno -O3 -new-struct-path-tbaa -emit-llvm -o - -x c++ %s | FileCheck %s -check-prefixes=CHECK,NewStructPathTBAA`

`extern "C" float expf(float);`

`// Emit int TBAA metadata on FP math libcalls, which is useful for alias analysis`

`// CHECK-LABEL: define dso_local noundef float {{.*}}foo`
`// CHECK-SAME: ptr nocapture noundef readonly [[NUM:%.*]], float noundef [[R2INV:%.*]], i32 noundef [[N:%.*]]) local_unnamed_addr #[[ATTR0:[0-9]+]] {`
`// CHECK-NEXT:  [[ENTRY:.*:]]`
`// CHECK-NEXT:    [[ARRAYIDX:%.*]] = getelementptr inbounds i8, ptr [[NUM]], i64 40`
`// CHECK-NEXT:    [[TMP0:%.*]] = load float, ptr [[ARRAYIDX]], align 4, !tbaa [[TBAA2:![0-9]+]]`
`// CHECK-NEXT:    [[CALL:%.*]] = tail call float @expf(float noundef [[TMP0]]) #[[ATTR2:[0-9]+]]`


`float foo (float num[], float r2inv, int n) {`
   `const float expm2 =  expf(num[10]);  // Emit TBAA metadata on @expf`
   `float tmp = expm2 * num[10];`
   `return tmp;`
`}`
`//.`
`// NoNewStructPathTBAA: [[TBAA2]] = !{[[META3:![0-9]+]], [[META3]], i64 0}`
`// NoNewStructPathTBAA: [[META3]] = !{!"float", [[META4:![0-9]+]], i64 0}`
`// NoNewStructPathTBAA: [[META4]] = !{!"omnipotent char", [[META5:![0-9]+]], i64 0}`
`// NoNewStructPathTBAA: [[META5]] = !{!"Simple C++ TBAA"}`
`//.`
`// NewStructPathTBAA: [[TBAA2]] = !{[[META3:![0-9]+]], [[META3]], i64 0, i64 4}`
`// NewStructPathTBAA: [[META3]] = !{[[META4:![0-9]+]], i64 4, !"float"}`
`// NewStructPathTBAA: [[META4]] = !{[[META5:![0-9]+]], i64 1, !"omnipotent char"}`
`// NewStructPathTBAA: [[META5]] = !{!"Simple C++ TBAA"}`
`//.`
`//// NOTE: These prefixes are unused and the list is autogenerated. Do not add tests below this line:`
`// NewStructPathTBAA: {{.*}}`
`// NoNewStructPathTBAA: {{.*}}`



https://github.com/llvm/llvm-project/pull/96025