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Hexagon (target/hexagon) fix bug in mem_noshuf load exception

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The semantics of a mem_noshuf packet are that the store effectively
happens before the load.  However, in cases where the load raises an
exception, we cannot simply execute the store first.

This change adds a probe to check that the load will not raise an
exception before executing the store.

If the load is predicated, this requires special handling.  We check
the condition before performing the probe.  Since, we need the EA to
perform the check, we move the GET_EA portion inside CHECK_NOSHUF_PRED.

Test case added in tests/tcg/hexagon/mem_noshuf_exception.c

Suggested-by: Alessandro Di Federico <ale@rev.ng>
Suggested-by: Anton Johansson <anjo@rev.ng>
Signed-off-by: Taylor Simpson <tsimpson@quicinc.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220707210546.15985-3-tsimpson@quicinc.com>
This commit is contained in:
Taylor Simpson 2022-07-07 14:05:46 -07:00
parent cab86dea1d
commit 15fc6badbd
7 changed files with 206 additions and 21 deletions
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7
target/hexagon/genptr.c
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@ -638,5 +638,12 @@ static void vec_to_qvec(size_t size, intptr_t dstoff, intptr_t srcoff)
tcg_temp_free_i64(mask);
}
static void probe_noshuf_load(TCGv va, int s, int mi)
{
TCGv size = tcg_constant_tl(s);
TCGv mem_idx = tcg_constant_tl(mi);
gen_helper_probe_noshuf_load(cpu_env, va, size, mem_idx);
}
#include "tcg_funcs_generated.c.inc"
#include "tcg_func_table_generated.c.inc"