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[Qemu-devel] [PATCH 4/8] tcg/optimize: add known-zero bits compute for l
From: |
Richard Henderson |
Subject: |
[Qemu-devel] [PATCH 4/8] tcg/optimize: add known-zero bits compute for load ops |
Date: |
Fri, 31 Jan 2014 08:46:59 -0600 |
From: Aurelien Jarno <address@hidden>
Cc: Paolo Bonzini <address@hidden>
Signed-off-by: Aurelien Jarno <address@hidden>
Signed-off-by: Richard Henderson <address@hidden>
---
tcg/optimize.c | 24 +++++++++++++++++++++++-
1 file changed, 23 insertions(+), 1 deletion(-)
diff --git a/tcg/optimize.c b/tcg/optimize.c
index 1cf017a..d3b099a 100644
--- a/tcg/optimize.c
+++ b/tcg/optimize.c
@@ -779,13 +779,35 @@ static TCGArg *tcg_constant_folding(TCGContext *s,
uint16_t *tcg_opc_ptr,
mask = temps[args[3]].mask | temps[args[4]].mask;
break;
+ CASE_OP_32_64(ld8u):
+ case INDEX_op_qemu_ld8u:
+ mask = 0xff;
+ break;
+ CASE_OP_32_64(ld16u):
+ case INDEX_op_qemu_ld16u:
+ mask = 0xffff;
+ break;
+ case INDEX_op_ld32u_i64:
+ case INDEX_op_qemu_ld32u:
+ mask = 0xffffffffu;
+ break;
+
+ CASE_OP_32_64(qemu_ld):
+ {
+ TCGMemOp mop = args[def->nb_oargs + def->nb_iargs];
+ if (!(mop & MO_SIGN)) {
+ mask = (2ULL << ((8 << (mop & MO_SIZE)) - 1)) - 1;
+ }
+ }
+ break;
+
default:
break;
}
/* 32-bit ops (non 64-bit ops and non load/store ops) generate 32-bit
results */
- if (!(tcg_op_defs[op].flags & (TCG_OPF_CALL_CLOBBER | TCG_OPF_64BIT)))
{
+ if (!(def->flags & (TCG_OPF_CALL_CLOBBER | TCG_OPF_64BIT))) {
mask &= 0xffffffffu;
}
--
1.8.5.3
- [Qemu-devel] [PATCH 0/8] tcg optimization improvements, Richard Henderson, 2014/01/31
- [Qemu-devel] [PATCH 1/8] tcg/optimize: fix known-zero bits for right shift ops, Richard Henderson, 2014/01/31
- [Qemu-devel] [PATCH 2/8] tcg/optimize: fix known-zero bits optimization, Richard Henderson, 2014/01/31
- [Qemu-devel] [PATCH 3/8] tcg/optimize: improve known-zero bits for 32-bit ops, Richard Henderson, 2014/01/31
- [Qemu-devel] [PATCH 4/8] tcg/optimize: add known-zero bits compute for load ops,
Richard Henderson <=
- [Qemu-devel] [PATCH 5/8] tcg/optimize: Handle known-zeros masks for ANDC, Richard Henderson, 2014/01/31
- [Qemu-devel] [PATCH 6/8] tcg/optimize: Simply some logical ops to NOT, Richard Henderson, 2014/01/31
- [Qemu-devel] [PATCH 7/8] tcg/optimize: Optmize ANDC X, Y, Y to MOV X, 0, Richard Henderson, 2014/01/31
- [Qemu-devel] [PATCH 8/8] tcg/optimize: Add more identity simplifications, Richard Henderson, 2014/01/31