[Bug middle-end/105071] [9 Regression] Incorrect code with -Os and complex<double>
cvs-commit at gcc dot gnu.org
gcc-bugzilla@gcc.gnu.org
Wed Mar 30 11:51:43 GMT 2022
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105071
--- Comment #5 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-9 branch has been updated by Martin Jambor
<jamborm@gcc.gnu.org>:
https://gcc.gnu.org/g:1dc4bed43760c4e291e072aa0c8c450f5775e25f
commit r9-10000-g1dc4bed43760c4e291e072aa0c8c450f5775e25f
Author: Martin Jambor <mjambor@suse.cz>
Date: Wed Mar 30 13:47:24 2022 +0200
cplxlower: Avoid a transform when looking at a default definition
In PR 97456, IPA-SRA triggers a bug in tree-complex.c where it
converts:
<bb 2>
a$_M_value_21 = COMPLEX_EXPR <ISRA.18_10(D), ISRA.18_10(D)>;
(where ISRA.18 is IPA-SRA created PARM_DECL with DECL_IGNORED_P set,
which is why it only happens with IPA-SRA) into:
<bb 2>
a$_M_value_21 = COMPLEX_EXPR <a$_M_value$real_10(D),
a$_M_value$real_10(D)>;
i.e. it replaces two uses of the parameter default-def with two
uninitialized default-defs of a new variable - all in hope to produce
code with better debug info.
This patch fixes it by avoiding the transform when the SSA_NAME to be
replaced is a default definition.
gcc/ChangeLog:
2020-10-19 Martin Jambor <mjambor@suse.cz>
PR tree-optimization/97456
PR middle-end/105071
* tree-complex.c (set_component_ssa_name): Do not replace ignored
decl
default definitions with new component vars. Reorder if
conditions.
gcc/testsuite/ChangeLog:
2020-10-19 Martin Jambor <mjambor@suse.cz>
PR tree-optimization/97456
* gcc.dg/tree-ssa/pr97456.c: New test.
(cherry picked from commit 619f91eaa8c8a50f1f9d3e7b96ee837037f0e806)
More information about the Gcc-bugs
mailing list