[Bug rtl-optimization/88253] Inlining of function incorrectly deletes volatile register access when using XOR in avr-gcc

[saaadhu at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88253

--- Comment #5 from Senthil Kumar Selvaraj <saaadhu at gcc dot gnu.org> ---
Author: saaadhu
Date: Mon Dec 17 10:50:54 2018
New Revision: 267198

URL: https://gcc.gnu.org/viewcvs?rev=267198&root=gcc&view=rev
Log:
Fix PR 88253

gcc/ChangeLog:

        PR rtl-optimization/88253
        * combine.c (combine_simplify_rtx): Test for side-effects before
        substituting by zero.

gcc/testsuite/ChangeLog:

        PR rtl-optimization/88253
        * gcc.target/avr/pr88253.c: New test.

Added:
    trunk/gcc/testsuite/gcc.target/avr/pr88253.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/combine.c
    trunk/gcc/testsuite/ChangeLog