Author: zhuqing
Date: 2012-01-13 00:43:31 -0500 (Fri, 13 Jan 2012)
New Revision: 3857
Modified:
trunk/osprey/be/cg/lra.cxx
Log:
Fix bug940.
For inline asm if the input and ouput are the same, we need to make sure they
use the same TN, stored in the same register.
Code Review: Lai Jian-Xin.
Modified: trunk/osprey/be/cg/lra.cxx
===================================================================
--- trunk/osprey/be/cg/lra.cxx 2011-12-26 08:44:54 UTC (rev 3856)
+++ trunk/osprey/be/cg/lra.cxx 2012-01-13 05:43:31 UTC (rev 3857)
@@ -5518,10 +5518,38 @@
Set_OP_opnd( op, opnd_idx, result );
} else {
+ if (TN_size(result) > 2)
+ Exp_COPY( opnd, result, &ops );
+ else
// Do sign/zero extend instead of regular copy. Needed for "sete" which
// doesn't clear the upper bits. Bug 5621.
- Exp_COPY_Ext(TN_size(result) == 2 ? TOP_movzwl : TOP_movzbl,
- opnd, result, &ops );
+ Exp_COPY_Ext(TN_size(result) == 2 ? TOP_movzwl : TOP_movzbl,
+ opnd, result, &ops );
+
+ // For inline asm, when opnd is both input and output, it needs to
+ // insert a mov from opnd to the new generate "result" to make sure
+ // asm output and input still use the same TN.
+ // Before: | Insert mov before asm: | Insert mov after asm:
+ // ---------------------------------------------------------------
+ // TN2 :- asm TN2 | TN3 :- mov TN2 | TN3 :- mov TN2
+ // | TN2 :- asm TN3 | TN3 :- asm TN3
+ // | | TN2 :- mov TN3
+
+ // Insert mov before asm
+ if (OP_code(op) == TOP_asm) {
+ for( int i = 0; i < OP_opnds( op ); i++ ){
+ TN * operand = OP_opnd( op, i );
+ if ( operand == opnd ) {
+ OPS ops_temp = OPS_EMPTY;
+ Exp_COPY( result, opnd, &ops_temp );
+ OP_srcpos(OPS_last(&ops_temp)) = OP_srcpos(op);
+ BB_Insert_Ops_Before( bb, op, &ops_temp );
+ Set_OP_opnd( op, i, result );
+ }
+ }
+ }
+
+ // Insert mov after asm
OP_srcpos(OPS_last(&ops)) = OP_srcpos(op);
BB_Insert_Ops_After( bb, op, &ops );
Set_OP_result( op, opnd_idx, result );
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