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[PATCH v4 50/51] tcg/optimize: Propagate sign info for bit counting
From: |
Richard Henderson |
Subject: |
[PATCH v4 50/51] tcg/optimize: Propagate sign info for bit counting |
Date: |
Tue, 26 Oct 2021 16:09:42 -0700 |
The results are generally 6 bit unsigned values, though
the count leading and trailing bits may produce any value
for a zero input.
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
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 515087876c..ccabc5ed54 100644
--- a/tcg/optimize.c
+++ b/tcg/optimize.c
@@ -1228,7 +1228,7 @@ 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;
}
@@ -1248,6 +1248,7 @@ 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 v4 40/51] tcg/optimize: Expand fold_addsub2_i32 to 64-bit ops, (continued)
- [PATCH v4 40/51] tcg/optimize: Expand fold_addsub2_i32 to 64-bit ops, Richard Henderson, 2021/10/26
- [PATCH v4 44/51] tcg/optimize: Use fold_xi_to_x for mul, Richard Henderson, 2021/10/26
- [PATCH v4 46/51] tcg/optimize: Use fold_xx_to_i for rem, Richard Henderson, 2021/10/26
- [PATCH v4 47/51] tcg/optimize: Optimize sign extensions, Richard Henderson, 2021/10/26
- [PATCH v4 50/51] tcg/optimize: Propagate sign info for bit counting,
Richard Henderson <=
- [PATCH v4 42/51] tcg/optimize: Stop forcing z_mask to "garbage" for 32-bit values, Richard Henderson, 2021/10/26
- [PATCH v4 43/51] tcg/optimize: Use fold_xx_to_i for orc, Richard Henderson, 2021/10/26
- [PATCH v4 49/51] tcg/optimize: Propagate sign info for setcond, Richard Henderson, 2021/10/26
- [PATCH v4 45/51] tcg/optimize: Use fold_xi_to_x for div, Richard Henderson, 2021/10/26