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[PATCH 47/48] tcg/optimize: Propagate sign info for bit counting
From: |
Richard Henderson |
Subject: |
[PATCH 47/48] tcg/optimize: Propagate sign info for bit counting |
Date: |
Sun, 29 Aug 2021 23:24:50 -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 | 2 ++
1 file changed, 2 insertions(+)
diff --git a/tcg/optimize.c b/tcg/optimize.c
index 788a5acf10..dad72b2ff5 100644
--- a/tcg/optimize.c
+++ b/tcg/optimize.c
@@ -1216,6 +1216,7 @@ 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(z_mask);
return false;
}
@@ -1236,6 +1237,7 @@ 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 31/48] tcg/optimize: Split out fold_xx_to_x, (continued)
- [PATCH 31/48] tcg/optimize: Split out fold_xx_to_x, Richard Henderson, 2021/08/30
- [PATCH 33/48] tcg/optimize: Add type to OptContext, Richard Henderson, 2021/08/30
- [PATCH 35/48] tcg/optimize: Split out fold_sub_to_neg, Richard Henderson, 2021/08/30
- [PATCH 36/48] tcg/optimize: Split out fold_xi_to_x, Richard Henderson, 2021/08/30
- [PATCH 37/48] tcg/optimize: Split out fold_ix_to_i, Richard Henderson, 2021/08/30
- [PATCH 39/48] tcg/optimize: Expand fold_mulu2_i32 to all 4-arg multiplies, Richard Henderson, 2021/08/30
- [PATCH 40/48] tcg/optimize: Expand fold_addsub2_i32 to 64-bit ops, Richard Henderson, 2021/08/30
- [PATCH 41/48] tcg/optimize: Sink commutative operand swapping into fold functions, Richard Henderson, 2021/08/30
- [PATCH 47/48] tcg/optimize: Propagate sign info for bit counting,
Richard Henderson <=
- [PATCH 44/48] tcg/optimize: Optimize sign extensions, Richard Henderson, 2021/08/30
- [PATCH 45/48] tcg/optimize: Propagate sign info for logical operations, Richard Henderson, 2021/08/30
- [PATCH 43/48] tcg/optimize: Stop forcing z_mask to "garbage" for 32-bit values, Richard Henderson, 2021/08/30
- [PATCH 46/48] tcg/optimize: Propagate sign info for setcond, Richard Henderson, 2021/08/30
- [PATCH 42/48] tcg/optimize: Add more simplifications for orc, Richard Henderson, 2021/08/30
- [PATCH 48/48] tcg/optimize: Propagate sign info for shifting, Richard Henderson, 2021/08/30
- Re: [PATCH 00/48] tcg: optimize redundant sign extensions, Philippe Mathieu-Daudé, 2021/08/30