r256182 - in /trunk/gcc: ChangeLog explow.c tes...

[law@gcc.gnu.org]

Author: law
Date: Wed Jan  3 18:22:28 2018
New Revision: 256182

URL: https://gcc.gnu.org/viewcvs?rev=256182&root=gcc&view=rev
Log:
	PR middle-end/83654
	* explow.c (anti_adjust_stack_and_probe_stack_clash): Test a
	non-constant residual for zero at runtime and avoid probing in
	that case.  Reorganize code for trailing problem to mirror handling
	of the residual.

	PR middle-end/83654
	* gcc.target/i386/stack-check-18.c: New test.
	* gcc.target/i386/stack-check-19.c: New test.

Added:
    trunk/gcc/testsuite/gcc.target/i386/stack-check-18.c
    trunk/gcc/testsuite/gcc.target/i386/stack-check-19.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/explow.c
    trunk/gcc/testsuite/ChangeLog