[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[PATCH v3 47/48] tcg/optimize: Propagate sign info for bit counting
From: |
Richard Henderson |
Subject: |
[PATCH v3 47/48] tcg/optimize: Propagate sign info for bit counting |
Date: |
Thu, 21 Oct 2021 14:05:38 -0700 |
The results are generally 6 bit unsigned values, though
the count leading and trailing bits may produce any value
for a zero input.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
tcg/optimize.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/tcg/optimize.c b/tcg/optimize.c
index 64d3256bbc..3dd9219d69 100644
--- a/tcg/optimize.c
+++ b/tcg/optimize.c
@@ -1215,7 +1215,7 @@ static bool fold_count_zeros(OptContext *ctx, TCGOp *op)
g_assert_not_reached();
}
ctx->z_mask = arg_info(op->args[2])->z_mask | z_mask;
-
+ ctx->s_mask = smask_from_zmask(ctx->z_mask);
return false;
}
@@ -1235,6 +1235,7 @@ static bool fold_ctpop(OptContext *ctx, TCGOp *op)
default:
g_assert_not_reached();
}
+ ctx->s_mask = smask_from_zmask(ctx->z_mask);
return false;
}
--
2.25.1
- [PATCH v3 41/48] tcg/optimize: Sink commutative operand swapping into fold functions, (continued)
- [PATCH v3 41/48] tcg/optimize: Sink commutative operand swapping into fold functions, Richard Henderson, 2021/10/21
- [PATCH v3 43/48] tcg/optimize: Stop forcing z_mask to "garbage" for 32-bit values, Richard Henderson, 2021/10/21
- [PATCH v3 48/48] tcg/optimize: Propagate sign info for shifting, Richard Henderson, 2021/10/21
- [PATCH v3 45/48] tcg/optimize: Propagate sign info for logical operations, Richard Henderson, 2021/10/21
- [PATCH v3 44/48] tcg/optimize: Optimize sign extensions, Richard Henderson, 2021/10/21
- [PATCH v3 47/48] tcg/optimize: Propagate sign info for bit counting,
Richard Henderson <=
- [PATCH v3 46/48] tcg/optimize: Propagate sign info for setcond, Richard Henderson, 2021/10/21