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[Qemu-devel] [PATCH v3 5/6] Do constant folding for shift operations.
From: |
Kirill Batuzov |
Subject: |
[Qemu-devel] [PATCH v3 5/6] Do constant folding for shift operations. |
Date: |
Thu, 7 Jul 2011 16:37:16 +0400 |
Perform constant forlding for SHR, SHL, SAR, ROTR, ROTL operations.
Signed-off-by: Kirill Batuzov <address@hidden>
---
tcg/optimize.c | 72 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 72 insertions(+), 0 deletions(-)
diff --git a/tcg/optimize.c b/tcg/optimize.c
index c469952..a1bb287 100644
--- a/tcg/optimize.c
+++ b/tcg/optimize.c
@@ -102,6 +102,11 @@ static int op_bits(int op)
case INDEX_op_and_i32:
case INDEX_op_or_i32:
case INDEX_op_xor_i32:
+ case INDEX_op_shl_i32:
+ case INDEX_op_shr_i32:
+ case INDEX_op_sar_i32:
+ case INDEX_op_rotl_i32:
+ case INDEX_op_rotr_i32:
return 32;
#if TCG_TARGET_REG_BITS == 64
case INDEX_op_mov_i64:
@@ -111,6 +116,11 @@ static int op_bits(int op)
case INDEX_op_and_i64:
case INDEX_op_or_i64:
case INDEX_op_xor_i64:
+ case INDEX_op_shl_i64:
+ case INDEX_op_shr_i64:
+ case INDEX_op_sar_i64:
+ case INDEX_op_rotl_i64:
+ case INDEX_op_rotr_i64:
return 64;
#endif
default:
@@ -205,6 +215,58 @@ static TCGArg do_constant_folding_2(int op, TCGArg x,
TCGArg y)
CASE_OP_32_64(xor):
return x ^ y;
+ case INDEX_op_shl_i32:
+ return (uint32_t)x << (uint32_t)y;
+
+#if TCG_TARGET_REG_BITS == 64
+ case INDEX_op_shl_i64:
+ return (uint64_t)x << (uint64_t)y;
+#endif
+
+ case INDEX_op_shr_i32:
+ return (uint32_t)x >> (uint32_t)y;
+
+#if TCG_TARGET_REG_BITS == 64
+ case INDEX_op_shr_i64:
+ return (uint64_t)x >> (uint64_t)y;
+#endif
+
+ case INDEX_op_sar_i32:
+ return (int32_t)x >> (int32_t)y;
+
+#if TCG_TARGET_REG_BITS == 64
+ case INDEX_op_sar_i64:
+ return (int64_t)x >> (int64_t)y;
+#endif
+
+ case INDEX_op_rotr_i32:
+#if TCG_TARGET_REG_BITS == 64
+ x &= 0xffffffff;
+ y &= 0xffffffff;
+#endif
+ x = (x << (32 - y)) | (x >> y);
+ return x;
+
+#if TCG_TARGET_REG_BITS == 64
+ case INDEX_op_rotr_i64:
+ x = (x << (64 - y)) | (x >> y);
+ return x;
+#endif
+
+ case INDEX_op_rotl_i32:
+#if TCG_TARGET_REG_BITS == 64
+ x &= 0xffffffff;
+ y &= 0xffffffff;
+#endif
+ x = (x << y) | (x >> (32 - y));
+ return x;
+
+#if TCG_TARGET_REG_BITS == 64
+ case INDEX_op_rotl_i64:
+ x = (x << y) | (x >> (64 - y));
+ return x;
+#endif
+
default:
fprintf(stderr,
"Unrecognized operation %d in do_constant_folding.\n", op);
@@ -278,6 +340,11 @@ static TCGArg *tcg_constant_folding(TCGContext *s,
uint16_t *tcg_opc_ptr,
switch (op) {
CASE_OP_32_64(add):
CASE_OP_32_64(sub):
+ CASE_OP_32_64(shl):
+ CASE_OP_32_64(shr):
+ CASE_OP_32_64(sar):
+ CASE_OP_32_64(rotl):
+ CASE_OP_32_64(rotr):
if (temps[args[1]].state == TCG_TEMP_CONST) {
/* Proceed with possible constant folding. */
break;
@@ -363,6 +430,11 @@ static TCGArg *tcg_constant_folding(TCGContext *s,
uint16_t *tcg_opc_ptr,
CASE_OP_32_64(or):
CASE_OP_32_64(and):
CASE_OP_32_64(xor):
+ CASE_OP_32_64(shl):
+ CASE_OP_32_64(shr):
+ CASE_OP_32_64(sar):
+ CASE_OP_32_64(rotl):
+ CASE_OP_32_64(rotr):
if (temps[args[1]].state == TCG_TEMP_CONST
&& temps[args[2]].state == TCG_TEMP_CONST) {
gen_opc_buf[op_index] = op_to_movi(op);
--
1.7.4.1
- [Qemu-devel] [PATCH v3 0/6] Implement constant folding and copy propagation in TCG, Kirill Batuzov, 2011/07/07
- [Qemu-devel] [PATCH v3 2/6] Add copy and constant propagation., Kirill Batuzov, 2011/07/07
- [Qemu-devel] [PATCH v3 1/6] Add TCG optimizations stub, Kirill Batuzov, 2011/07/07
- [Qemu-devel] [PATCH v3 4/6] Do constant folding for boolean operations., Kirill Batuzov, 2011/07/07
- [Qemu-devel] [PATCH v3 3/6] Do constant folding for basic arithmetic operations., Kirill Batuzov, 2011/07/07
- [Qemu-devel] [PATCH v3 6/6] Do constant folding for unary operations., Kirill Batuzov, 2011/07/07
- [Qemu-devel] [PATCH v3 5/6] Do constant folding for shift operations.,
Kirill Batuzov <=
- Re: [Qemu-devel] [PATCH v3 0/6] Implement constant folding and copy propagation in TCG, Peter Maydell, 2011/07/07
- Re: [Qemu-devel] [PATCH v3 0/6] Implement constant folding and copy propagation in TCG, Blue Swirl, 2011/07/30