https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100428
--- Comment #5 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Tom de Vries <vr...@gcc.gnu.org>: https://gcc.gnu.org/g:456de10c549379b74d4858f00d4b8817035a73fc commit r12-6967-g456de10c549379b74d4858f00d4b8817035a73fc Author: Tom de Vries <tdevr...@suse.de> Date: Sun Jan 23 06:42:24 2022 +0100 [nvptx] Handle nop in prevent_branch_around_nothing When running libgomp test-case reduction-7.c on an nvptx accelerator (T400, driver version 470.86) and GOMP_NVPTX_JIT=-O0, I run into: ... reduction-7.exe:reduction-7.c:312: v_p_2: \ Assertion `out[j * 32 + i] == (i + j) * 2' failed. FAIL: libgomp.oacc-c/../libgomp.oacc-c-c++-common/reduction-7.c \ -DACC_DEVICE_TYPE_nvidia=1 -DACC_MEM_SHARED=0 -foffload=nvptx-none \ -O0 execution test ... During investigation I found ptx code like this: ... @ %r163 bra $L262; $L262: ... There's a known problem with executing this type of code, and a workaround is in place to address this: prevent_branch_around_nothing. The workaround does not trigger though because it doesn't handle the nop insn. Fix this by handling the nop insn in prevent_branch_around_nothing. Tested libgomp on x86_64 with nvptx accelerator. gcc/ChangeLog: 2022-01-27 Tom de Vries <tdevr...@suse.de> PR target/100428 * config/nvptx/nvptx.cc (prevent_branch_around_nothing): Handle nop insn.
