[committed,nvptx] Handle asm insn in prevent_branch_around_nothing
Commit Message
Hi,
With GOMP_NVPTX_JIT=-00 and -mptx=3.1, I run into:
...
FAIL: libgomp.oacc-c/../libgomp.oacc-c-c++-common/acc_prof-version-1.c \
-DACC_DEVICE_TYPE_nvidia=1 -DACC_MEM_SHARED=0 -foffload=nvptx-none -O2 \
execution test
...
The problem is that we're generating a diverging branch around nothing:
...
{
.reg.u32 %x;
mov.u32 %x, %tid.x;
setp.ne.u32 %r23, %x, 0;
}
@%r23 bra $L2;
$L2:
...
which the driver JIT has problems with at -O0, so consequently we run into the
nvptx_uniform_warp_check.
Fix this by handling asm ("") and alike in prevent_branch_around_nothing.
Tested on x86_64 with nvptx accelerator.
Committed to trunk.
Thanks,
- Tom
[nvptx] Handle asm insn in prevent_branch_around_nothing
gcc/ChangeLog:
2022-02-10 Tom de Vries <tdevries@suse.de>
PR target/104456
* config/nvptx/nvptx.cc (prevent_branch_around_nothing): Handle asm
insn.
---
gcc/config/nvptx/nvptx.cc | 8 ++++++++
1 file changed, 8 insertions(+)
@@ -5257,6 +5257,14 @@ prevent_branch_around_nothing (void)
case CODE_FOR_nvptx_join:
case CODE_FOR_nop:
continue;
+ case -1:
+ /* Handle asm ("") and similar. */
+ if (GET_CODE (PATTERN (insn)) == ASM_INPUT
+ || GET_CODE (PATTERN (insn)) == ASM_OPERANDS
+ || (GET_CODE (PATTERN (insn)) == PARALLEL
+ && asm_noperands (PATTERN (insn)) >= 0))
+ continue;
+ /* FALLTHROUGH. */
default:
seen_label = NULL;
continue;