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[4/4] tcg/optimize: add known-zero bits compute for load ops

Message ID 1378189680-11987-5-git-send-email-aurelien@aurel32.net
State New
Headers show

Commit Message

Aurelien Jarno Sept. 3, 2013, 6:28 a.m. UTC 
Cc: Richard Henderson <rth@twiddle.net>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
---
 tcg/optimize.c |   13 +++++++++++++
 1 file changed, 13 insertions(+)
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Patch

diff --git a/tcg/optimize.c b/tcg/optimize.c
index b1f736b..044f456 100644
--- a/tcg/optimize.c
+++ b/tcg/optimize.c
@@ -787,6 +787,19 @@  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;
+
         default:
             break;
         }