Successfully identified regression in *gcc* in CI configuration
tcwg_bmk_gnu_tx1/gnu-release-aarch64-spec2k6-O3. So far, this commit has
regressed CI configurations:
- tcwg_bmk_gnu_tx1/gnu-release-aarch64-spec2k6-O3
Culprit:
<cut>
commit ee875b63b22e30a0dcb4b05f7532c2c416ba6cd0
Author: Richard Biener <rguent...@suse.de>
Date: Tue Aug 17 08:38:35 2021 +0200
tree-optimization/101868 - avoid PRE of trapping mems across calls
This backports a fix for the omission of a check of trapping mems
when hoisting them across calls that might not return. This was
originally done as part of a fix to handle const functions that throw
properly.
2021-08-17 Richard Biener <rguent...@suse.de>
PR tree-optimization/101373
PR tree-optimization/101868
* tree-ssa-pre.c (prune_clobbered_mems): Also prune trapping
references when the BB may not return.
* gcc.dg/lto/pr101868_0.c: New testcase.
* gcc.dg/lto/pr101868_1.c: Likewise.
* gcc.dg/lto/pr101868_2.c: Likewise.
* gcc.dg/lto/pr101868_3.c: Likewise.
</cut>
Results regressed to (for first_bad == ee875b63b22e30a0dcb4b05f7532c2c416ba6cd0)
# reset_artifacts:
-10
# build_abe binutils:
-9
# build_abe stage1 -- --set gcc_override_configure=--disable-libsanitizer:
-8
# build_abe linux:
-7
# build_abe glibc:
-6
# build_abe stage2 -- --set gcc_override_configure=--disable-libsanitizer:
-5
# true:
0
# benchmark -- -O3
artifacts/build-ee875b63b22e30a0dcb4b05f7532c2c416ba6cd0/results_id:
1
# 429.mcf,mcf_base.default regressed by 106
# 429.mcf,[.] price_out_impl regressed by 174
from (for last_good == a0a0499b8bb920fdd98e791804812f001f0b4fe8)
# reset_artifacts:
-10
# build_abe binutils:
-9
# build_abe stage1 -- --set gcc_override_configure=--disable-libsanitizer:
-8
# build_abe linux:
-7
# build_abe glibc:
-6
# build_abe stage2 -- --set gcc_override_configure=--disable-libsanitizer:
-5
# true:
0
# benchmark -- -O3
artifacts/build-a0a0499b8bb920fdd98e791804812f001f0b4fe8/results_id:
1
Artifacts of last_good build:
https://ci.linaro.org/job/tcwg_bmk_ci_gnu-bisect-tcwg_bmk_tx1-gnu-release-aarch64-spec2k6-O3/32/artifact/artifacts/build-a0a0499b8bb920fdd98e791804812f001f0b4fe8/
Results ID of last_good:
tx1_64/tcwg_bmk_gnu_tx1/bisect-gnu-release-aarch64-spec2k6-O3/4846
Artifacts of first_bad build:
https://ci.linaro.org/job/tcwg_bmk_ci_gnu-bisect-tcwg_bmk_tx1-gnu-release-aarch64-spec2k6-O3/32/artifact/artifacts/build-ee875b63b22e30a0dcb4b05f7532c2c416ba6cd0/
Results ID of first_bad:
tx1_64/tcwg_bmk_gnu_tx1/bisect-gnu-release-aarch64-spec2k6-O3/4851
Build top page/logs:
https://ci.linaro.org/job/tcwg_bmk_ci_gnu-bisect-tcwg_bmk_tx1-gnu-release-aarch64-spec2k6-O3/32/
Configuration details:
Reproduce builds:
<cut>
mkdir investigate-gcc-ee875b63b22e30a0dcb4b05f7532c2c416ba6cd0
cd investigate-gcc-ee875b63b22e30a0dcb4b05f7532c2c416ba6cd0
git clone https://git.linaro.org/toolchain/jenkins-scripts
mkdir -p artifacts/manifests
curl -o artifacts/manifests/build-baseline.sh
https://ci.linaro.org/job/tcwg_bmk_ci_gnu-bisect-tcwg_bmk_tx1-gnu-release-aarch64-spec2k6-O3/32/artifact/artifacts/manifests/build-baseline.sh
--fail
curl -o artifacts/manifests/build-parameters.sh
https://ci.linaro.org/job/tcwg_bmk_ci_gnu-bisect-tcwg_bmk_tx1-gnu-release-aarch64-spec2k6-O3/32/artifact/artifacts/manifests/build-parameters.sh
--fail
curl -o artifacts/test.sh
https://ci.linaro.org/job/tcwg_bmk_ci_gnu-bisect-tcwg_bmk_tx1-gnu-release-aarch64-spec2k6-O3/32/artifact/artifacts/test.sh
--fail
chmod +x artifacts/test.sh
# Reproduce the baseline build (build all pre-requisites)
./jenkins-scripts/tcwg_bmk-build.sh @@ artifacts/manifests/build-baseline.sh
# Save baseline build state (which is then restored in artifacts/test.sh)
mkdir -p ./bisect
rsync -a --del --delete-excluded --exclude /bisect/ --exclude /artifacts/
--exclude /gcc/ ./ ./bisect/baseline/
cd gcc
# Reproduce first_bad build
git checkout --detach ee875b63b22e30a0dcb4b05f7532c2c416ba6cd0
../artifacts/test.sh
# Reproduce last_good build
git checkout --detach a0a0499b8bb920fdd98e791804812f001f0b4fe8
../artifacts/test.sh
cd ..
</cut>
History of pending regressions and results:
https://git.linaro.org/toolchain/ci/base-artifacts.git/log/?h=linaro-local/ci/tcwg_bmk_gnu_tx1/gnu-release-aarch64-spec2k6-O3
Artifacts:
https://ci.linaro.org/job/tcwg_bmk_ci_gnu-bisect-tcwg_bmk_tx1-gnu-release-aarch64-spec2k6-O3/32/artifact/artifacts/
Build log:
https://ci.linaro.org/job/tcwg_bmk_ci_gnu-bisect-tcwg_bmk_tx1-gnu-release-aarch64-spec2k6-O3/32/consoleText
Full commit (up to 1000 lines):
<cut>
commit ee875b63b22e30a0dcb4b05f7532c2c416ba6cd0
Author: Richard Biener <rguent...@suse.de>
Date: Tue Aug 17 08:38:35 2021 +0200
tree-optimization/101868 - avoid PRE of trapping mems across calls
This backports a fix for the omission of a check of trapping mems
when hoisting them across calls that might not return. This was
originally done as part of a fix to handle const functions that throw
properly.
2021-08-17 Richard Biener <rguent...@suse.de>
PR tree-optimization/101373
PR tree-optimization/101868
* tree-ssa-pre.c (prune_clobbered_mems): Also prune trapping
references when the BB may not return.
* gcc.dg/lto/pr101868_0.c: New testcase.
* gcc.dg/lto/pr101868_1.c: Likewise.
* gcc.dg/lto/pr101868_2.c: Likewise.
* gcc.dg/lto/pr101868_3.c: Likewise.
---
gcc/testsuite/gcc.dg/lto/pr101868_0.c | 33 +++++++++++++++++++++++++++++++++
gcc/testsuite/gcc.dg/lto/pr101868_1.c | 23 +++++++++++++++++++++++
gcc/testsuite/gcc.dg/lto/pr101868_2.c | 11 +++++++++++
gcc/testsuite/gcc.dg/lto/pr101868_3.c | 8 ++++++++
gcc/tree-ssa-pre.c | 7 +++++++
5 files changed, 82 insertions(+)
diff --git a/gcc/testsuite/gcc.dg/lto/pr101868_0.c
b/gcc/testsuite/gcc.dg/lto/pr101868_0.c
new file mode 100644
index 00000000000..c84d19b0267
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/lto/pr101868_0.c
@@ -0,0 +1,33 @@
+/* { dg-lto-do run } */
+/* { dg-lto-options { "-O2 -fno-strict-aliasing -flto" } } */
+
+typedef unsigned long VALUE;
+
+__attribute__ ((cold))
+void rb_check_type(VALUE, int);
+
+static VALUE
+repro(VALUE dummy, VALUE hash)
+{
+ if (hash == 0) {
+ rb_check_type(hash, 1);
+ }
+ else if (*(long *)hash) {
+ rb_check_type(hash, 1);
+ }
+
+
+ return *(long *)hash;
+}
+
+static VALUE (*that)(VALUE dummy, VALUE hash) = repro;
+
+int
+main(int argc, char **argv)
+{
+ argc--;
+ that(0, argc);
+
+ rb_check_type(argc, argc);
+
+}
diff --git a/gcc/testsuite/gcc.dg/lto/pr101868_1.c
b/gcc/testsuite/gcc.dg/lto/pr101868_1.c
new file mode 100644
index 00000000000..146c14abc76
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/lto/pr101868_1.c
@@ -0,0 +1,23 @@
+typedef unsigned long VALUE;
+
+
+__attribute__ ((noreturn)) void rexc_raise(VALUE mesg);
+
+VALUE rb_donothing(VALUE klass);
+
+static void
+funexpected_type(VALUE x, int xt, int t)
+{
+ rexc_raise(rb_donothing(0));
+}
+
+__attribute__ ((cold))
+void
+rb_check_type(VALUE x, int t)
+{
+ int xt;
+
+ if (x == 0) {
+ funexpected_type(x, xt, t);
+ }
+}
diff --git a/gcc/testsuite/gcc.dg/lto/pr101868_2.c
b/gcc/testsuite/gcc.dg/lto/pr101868_2.c
new file mode 100644
index 00000000000..e6f01b23f45
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/lto/pr101868_2.c
@@ -0,0 +1,11 @@
+typedef unsigned long VALUE;
+
+static void thing(void) {}
+static void (*ptr)(void) = &thing;
+
+VALUE
+rb_donothing(VALUE klass)
+{
+ ptr();
+ return 0;
+}
diff --git a/gcc/testsuite/gcc.dg/lto/pr101868_3.c
b/gcc/testsuite/gcc.dg/lto/pr101868_3.c
new file mode 100644
index 00000000000..61217625be7
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/lto/pr101868_3.c
@@ -0,0 +1,8 @@
+typedef unsigned long VALUE;
+
+__attribute__((noreturn))
+void
+rexc_raise(VALUE mesg)
+{
+ __builtin_exit(0);
+}
diff --git a/gcc/tree-ssa-pre.c b/gcc/tree-ssa-pre.c
index 04ec4fbaeec..2aedc31e1d7 100644
--- a/gcc/tree-ssa-pre.c
+++ b/gcc/tree-ssa-pre.c
@@ -2070,6 +2070,13 @@ prune_clobbered_mems (bitmap_set_t set, basic_block
block)
&& value_dies_in_block_x (expr, block))))
to_remove = i;
}
+ /* If the REFERENCE may trap make sure the block does not contain
+ a possible exit point.
+ ??? This is overly conservative if we translate AVAIL_OUT
+ as the available expression might be after the exit point. */
+ if (BB_MAY_NOTRETURN (block)
+ && vn_reference_may_trap (ref))
+ to_remove = i;
}
else if (expr->kind == NARY)
{
</cut>
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