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[PATCH 46/48] tcg/optimize: Propagate sign info for setcond
From: |
Richard Henderson |
Subject: |
[PATCH 46/48] tcg/optimize: Propagate sign info for setcond |
Date: |
Sun, 29 Aug 2021 23:24:49 -0700 |
The result is either 0 or 1, which means that we have
a 2 bit signed result, and thus 62 bits of sign.
For clarity, use the smask_from_zmask function.
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 cbb5700f44..788a5acf10 100644
--- a/tcg/optimize.c
+++ b/tcg/optimize.c
@@ -1681,6 +1681,7 @@ static bool fold_setcond(OptContext *ctx, TCGOp *op)
}
ctx->z_mask = 1;
+ ctx->s_mask = smask_from_zmask(1);
return false;
}
@@ -1753,6 +1754,7 @@ static bool fold_setcond2(OptContext *ctx, TCGOp *op)
}
ctx->z_mask = 1;
+ ctx->s_mask = smask_from_zmask(1);
return false;
do_setcond_const:
--
2.25.1
- [PATCH 37/48] tcg/optimize: Split out fold_ix_to_i, (continued)
- [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, 2021/08/30
- [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 <=
- [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