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From: Richard Biener <rguenth@gcc.gnu.org> To: gcc-cvs@gcc.gnu.org Subject: [gcc r11-8875] tree-optimization/101868 - avoid PRE of trapping mems across calls Date: Tue, 17 Aug 2021 09:21:50 +0000 (GMT) [thread overview] Message-ID: <20210817092150.D1924382C42E@sourceware.org> (raw) https://gcc.gnu.org/g:ee875b63b22e30a0dcb4b05f7532c2c416ba6cd0 commit r11-8875-gee875b63b22e30a0dcb4b05f7532c2c416ba6cd0 Author: Richard Biener <rguenther@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 <rguenther@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. Diff: --- 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) {
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