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tcg/optimize: Fix a_mask computation for orc

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In computing a_mask, for or, we remove the bits from t1->o_mask
which are known to be zero.  For orc, the bits known to be zero
are the inverse of those known to be one.

Cc: qemu-stable@nongnu.org
Fixes: cc4033ee47 ("tcg/optimize: Build and use zero, one and affected bits in fold_orc")
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
(cherry picked from commit 08b12bfb8f532dbc62e35c31d081ede1aa12098b)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
This commit is contained in:
Richard Henderson 2026-01-11 18:03:01 +11:00 • committed by Michael Tokarev
parent 682e043b17
commit b276b2ca22
1 changed files with 1 additions and 1 deletions
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2
tcg/optimize.c
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@ -2360,7 +2360,7 @@ static bool fold_orc(OptContext *ctx, TCGOp *op)
s_mask = t1->s_mask & t2->s_mask;
/* Affected bits are those not known one, masked by those known one. */
a_mask = ~t1->o_mask & t2->o_mask;
a_mask = ~t1->o_mask & ~t2->o_mask;
return fold_masks_zosa(ctx, op, z_mask, o_mask, s_mask, a_mask);
}