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| author | Andrew Pinski <quic_apinski@quicinc.com> | 2025-01-16 23:47:36 -0800 |
|---|---|---|
| committer | Andrew Pinski <quic_apinski@quicinc.com> | 2025-04-11 08:58:30 -0700 |
| commit | 33b255a1aa2f21889a8cfecb7a67a63fefa19460 (patch) | |
| tree | 7392f08ef6c831f72bdcb17df64e3ab2dceae562 /gcc | |
| parent | 992be16d83814694d6dbce448f9b5cb47ba4c8d4 (diff) | |
| download | gcc-33b255a1aa2f21889a8cfecb7a67a63fefa19460.zip gcc-33b255a1aa2f21889a8cfecb7a67a63fefa19460.tar.gz gcc-33b255a1aa2f21889a8cfecb7a67a63fefa19460.tar.bz2 | |
testcase: Add testcase for shrink wrapping of vector<int>::push_back [PR118502]
LLVM folks noticed that GCC was shrink wrapping the call to vector<int>::push_back.
So I thought it was a good idea to commit a testcase to make sure GCC does not regress
in this area unknowning.
Note the shrink wrapping started with r15-1619-g3b9b8d6cfdf593.
Note this enables the testcase for x86_64 (!ia32), powerpc, aarch64 and riscv which I tested
via godbolt to see the shrink wrapping occurs. Also tested the testcase for both
x86_64-linux-gnu and aarch64-linux-gnu to make sure I got the target selects correct.
Changes since v1:
* v2: Fix some comments typos that was mentioned in the bug report.
PR rtl-optimization/118502
gcc/testsuite/ChangeLog:
* g++.dg/opt/shrink-wrapping-vector-1.C: New test.
Signed-off-by: Andrew Pinski <quic_apinski@quicinc.com>
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/testsuite/g++.dg/opt/shrink-wrapping-vector-1.C | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/gcc/testsuite/g++.dg/opt/shrink-wrapping-vector-1.C b/gcc/testsuite/g++.dg/opt/shrink-wrapping-vector-1.C new file mode 100644 index 0000000..8b1ad53 --- /dev/null +++ b/gcc/testsuite/g++.dg/opt/shrink-wrapping-vector-1.C @@ -0,0 +1,17 @@ +// { dg-do compile { target { { { i?86-*-* x86_64-*-* } && { ! ia32 } } || { powerpc*-*-* aarch64*-*-* riscv*-*-* } } } } +// { dg-options "-O2 -fdump-rtl-pro_and_epilogue" } +// { dg-skip-if "requires hosted libstdc++ for vector" { ! hostedlib } } + +// PR rtl-optimization/118502 + +// The shrink-wrapping should happen around the slow path of vector<int>::push_back, +// The fast path is just checking if there is enough space and doing a few stores. +// We want to verify that shrink wrapping always happens. + +#include <vector> + +void push_back(std::vector<int>& xs, unsigned char x) { + xs.push_back(x); +} + +/* { dg-final { scan-rtl-dump "Performing shrink-wrapping" "pro_and_epilogue" } } */ |