From 9dac5f646c025a82c2dfb841db019fc8e1e77945 Mon Sep 17 00:00:00 2001
From: John van Groningen
Date: Fri, 24 Mar 2006 11:26:30 +0000
Subject: remove use of scratch register on IA32 for shift instructions (by
 adding instruction with extra register), IScc, IFScc, IFBcc (by adding IFCcc
 instructions with extra register), ICMPW (not used anymore) prevent
 generating FLD and FSTP instructions between FCOMP and FNSTSW instruction

---
 cgaas.c | 73 +++++++++++++++++++++++++++++++++++++++++++++++++++++------------
 1 file changed, 60 insertions(+), 13 deletions(-)

(limited to 'cgaas.c')

diff --git a/cgaas.c b/cgaas.c
index bd0e5c4..39a0b5a 100644
--- a/cgaas.c
+++ b/cgaas.c
@@ -1857,14 +1857,60 @@ static void as_cmp_i_parameter (int i,struct parameter *parameter)
 	}
 }
 
-static void as_cmp_instruction (struct instruction *instruction,int size_flag)
+static void as_cmp_instruction (struct instruction *instruction)
 {
 	struct parameter parameter_0,parameter_1;
 
 	parameter_0=instruction->instruction_parameters[0];
 	parameter_1=instruction->instruction_parameters[1];
 
-	if (parameter_1.parameter_type==P_INDIRECT && size_flag!=SIZE_LONG){
+	switch (parameter_0.parameter_type){
+		case P_DESCRIPTOR_NUMBER:
+			switch (parameter_1.parameter_type){
+				case P_REGISTER:
+					as_d_r2 (0201,0070,0075,parameter_0.parameter_data.l,parameter_0.parameter_offset,
+						parameter_1.parameter_data.reg.r);
+					return;
+				case P_INDIRECT:
+					as_d_id (0201,0070,parameter_0.parameter_data.l,parameter_0.parameter_offset,
+						parameter_1.parameter_offset,parameter_1.parameter_data.reg.r);
+					return;
+				case P_INDEXED:
+					as_d_x (0201,0070,parameter_0.parameter_data.l,parameter_0.parameter_offset,
+						parameter_1.parameter_offset,parameter_1.parameter_data.ir);
+					return;
+			}
+			break;
+		case P_IMMEDIATE:
+			as_cmp_i_parameter (parameter_0.parameter_data.i,&parameter_1);
+			return;
+	}
+
+	if (parameter_1.parameter_type==P_REGISTER)
+		switch (parameter_0.parameter_type){
+			case P_REGISTER:
+				as_r_r (0073,parameter_0.parameter_data.reg.r,parameter_1.parameter_data.reg.r);
+				return;
+			case P_INDIRECT:
+				as_id_r (0073,parameter_0.parameter_offset,parameter_0.parameter_data.reg.r,parameter_1.parameter_data.reg.r);
+				return;
+			case P_INDEXED:
+				as_x_r (0073,parameter_0.parameter_offset,parameter_0.parameter_data.ir,parameter_1.parameter_data.reg.r);
+				return;					
+		}
+
+	internal_error_in_function ("as_cmp_instruction");
+}
+
+#if 0
+static void as_cmpw_instruction (struct instruction *instruction)
+{
+	struct parameter parameter_0,parameter_1;
+
+	parameter_0=instruction->instruction_parameters[0];
+	parameter_1=instruction->instruction_parameters[1];
+
+	if (parameter_1.parameter_type==P_INDIRECT){
 		/* movswl */
 		as_017_id_r (0277,instruction->instruction_parameters[1].parameter_offset,
 			instruction->instruction_parameters[1].parameter_data.reg.r,REGISTER_O0);
@@ -1894,14 +1940,12 @@ static void as_cmp_instruction (struct instruction *instruction,int size_flag)
 			as_cmp_i_parameter (parameter_0.parameter_data.i,&parameter_1);
 			return;
 		case P_INDIRECT:
-			if (size_flag==SIZE_WORD){
-				/* movswl */
-				as_017_id_r (0277,instruction->instruction_parameters[0].parameter_offset,
-					instruction->instruction_parameters[0].parameter_data.reg.r,REGISTER_O0);
-		
-				parameter_0.parameter_type=P_REGISTER;
-				parameter_0.parameter_data.reg.r=REGISTER_O0;
-			}
+			/* movswl */
+			as_017_id_r (0277,instruction->instruction_parameters[0].parameter_offset,
+				instruction->instruction_parameters[0].parameter_data.reg.r,REGISTER_O0);
+	
+			parameter_0.parameter_type=P_REGISTER;
+			parameter_0.parameter_data.reg.r=REGISTER_O0;
 	}
 
 	if (parameter_1.parameter_type==P_REGISTER)
@@ -1917,8 +1961,9 @@ static void as_cmp_instruction (struct instruction *instruction,int size_flag)
 				return;					
 		}
 
-	internal_error_in_function ("as_cmp_instruction");
+	internal_error_in_function ("as_cmpw_instruction");
 }
+#endif
 
 void store_label_in_data_section (LABEL *label)
 {
@@ -3695,7 +3740,7 @@ static void as_instructions (struct instruction *instruction)
 				as_sub_instruction (instruction);
 				break;
 			case ICMP:
-				as_cmp_instruction (instruction,SIZE_LONG);
+				as_cmp_instruction (instruction);
 				break;
 			case IJMP:
 				as_jmp_instruction (instruction);
@@ -3819,9 +3864,11 @@ static void as_instructions (struct instruction *instruction)
 			case ISNO:
 				as_set_condition_instruction (instruction,1);
 				break;
+#if 0
 			case ICMPW:
-				as_cmp_instruction (instruction,SIZE_WORD);
+				as_cmpw_instruction (instruction);
 				break;
+#endif
 			case ITST:
 				as_tst_instruction (instruction);
 				break;
-- 
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