[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 <tdevries@suse.de> PR target/100428 * config/nvptx/nvptx.cc (prevent_branch_around_nothing): Handle nop insn.
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@ -5103,6 +5103,7 @@ prevent_branch_around_nothing (void)
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case CODE_FOR_nvptx_forked:
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case CODE_FOR_nvptx_joining:
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case CODE_FOR_nvptx_join:
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case CODE_FOR_nop:
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continue;
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default:
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seen_label = NULL;
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