From a6096a27f69e7940a427f3f354da29e6418d865a Mon Sep 17 00:00:00 2001
From: Richard Kenner <kenner@gcc.gnu.org>
Date: Mon, 17 Mar 1997 17:21:25 -0500
Subject: [PATCH] (beq0_di, bne0_di, bge0_di, blt0_di): Use cmpw #0 instead of
 tstl when testing address registers on the 68000.

From-SVN: r13728
---
 gcc/config/m68k/m68k.md | 59 ++++++++++++++++++++++++++++++++++-------
 1 file changed, 50 insertions(+), 9 deletions(-)

diff --git a/gcc/config/m68k/m68k.md b/gcc/config/m68k/m68k.md
index 058f4742144..3828d612dc9 100644
--- a/gcc/config/m68k/m68k.md
+++ b/gcc/config/m68k/m68k.md
@@ -5452,10 +5452,21 @@
     return \"move%.l %0,%2\;or%.l %3,%2\;jeq %l1\";
 #endif
   operands[4] = gen_label_rtx();
+  if (TARGET_68020 || TARGET_5200)
+#ifdef MOTOROLA
+    output_asm_insn (\"tst%.l %0\;jbne %l4\;tst%.l %3\;jbeq %l1\", operands);
+#else
+    output_asm_insn (\"tst%.l %0\;jne %l4\;tst%.l %3\;jeq %l1\", operands);
+#endif
+  else
 #ifdef MOTOROLA
-  output_asm_insn (\"tst%.l %0\;jbne %l4\;tst%.l %3\;jbeq %l1\", operands);
+#ifdef SGS_CMP_ORDER
+    output_asm_insn (\"cmp%.w %0,%#0\;jbne %l4\;cmp%.w %3,%#0\;jbeq %l1\", operands);
+#else
+    output_asm_insn (\"cmp%.w %#0,%0\;jbne %l4\;cmp%.w %#0,%3\;jbeq %l1\", operands);
+#endif
 #else
-  output_asm_insn (\"tst%.l %0\;jne %l4\;tst%.l %3\;jeq %l1\", operands);
+    output_asm_insn (\"cmp%.w %#0,%0\;jne %l4\;cmp%.w %#0,%3\;jeq %l1\", operands);
 #endif
   ASM_OUTPUT_INTERNAL_LABEL (asm_out_file, \"L\",
 				CODE_LABEL_NUMBER (operands[4]));
@@ -5489,7 +5500,13 @@
     operands[3] = gen_rtx (REG, SImode, REGNO (operands[0]) + 1);
   else
     operands[3] = adj_offsettable_operand (operands[0], 4);
-  if (ADDRESS_REG_P (operands[0]))
+  if (!ADDRESS_REG_P (operands[0]))
+#ifdef MOTOROLA
+    return \"move%.l %0,%2\;or%.l %3,%2\;jbne %l1\";
+#else
+    return \"move%.l %0,%2\;or%.l %3,%2\;jne %l1\";
+#endif
+  if (TARGET_68020 || TARGET_5200)
 #ifdef MOTOROLA
     return \"tst%.l %0\;jbne %l1\;tst%.l %3\;jbne %l1\";
 #else
@@ -5497,9 +5514,13 @@
 #endif
   else
 #ifdef MOTOROLA
-    return \"move%.l %0,%2\;or%.l %3,%2\;jbne %l1\";
+#ifdef SGS_CMP_ORDER
+    return \"cmp%.w %#0,%0\;jbne %l1\;cmp%.w %#0,%3\;jbne %l1\";
 #else
-    return \"move%.l %0,%2\;or%.l %3,%2\;jne %l1\";
+    return \"cmp%.w %0,%#0\;jbne %l1\;cmp%.w %3,%#0\;jbne %l1\";
+#endif
+#else
+    return \"cmp%.w %#0,%0\;jne %l1\;cmp%.w %#0,%3\;jne %l1\";
 #endif
 } ")
 
@@ -5536,10 +5557,20 @@
 	}
     }
   CC_STATUS_INIT;
+  if (TARGET_68020 || TARGET_5200 || ! ADDRESS_REG_P (operands[0]))
+    output_asm_insn(\"tst%.l %0\", operands);
+  else
+    /* On an address reg, cmpw may replace cmpl.  */
+#ifdef SGS_CMP_ORDER
+    output_asm_insn(\"cmp%.w %0,%#0\", operands);
+#else
+    output_asm_insn(\"cmp%.w %#0,%0\", operands);
+#endif
+
 #ifdef MOTOROLA
-  return \"tst%.l %0\;jbpl %l1\";
+    return \"jbpl %l1\";
 #else
-  return \"tst%.l %0\;jpl %l1\";
+    return \"jpl %l1\";
 #endif
 } ")
 
@@ -5576,10 +5607,20 @@
 	}
     }
   CC_STATUS_INIT;
+  if (TARGET_68020 || TARGET_5200 || ! ADDRESS_REG_P (operands[0]))
+    output_asm_insn(\"tst%.l %0\", operands);
+  else
+    /* On an address reg, cmpw may replace cmpl.  */
+#ifdef SGS_CMP_ORDER
+    output_asm_insn(\"cmp%.w %0,%#0\", operands);
+#else
+    output_asm_insn(\"cmp%.w %#0,%0\", operands);
+#endif
+
 #ifdef MOTOROLA
-  return \"tst%.l %0\;jbmi %l1\";
+  return \"jbmi %l1\";
 #else
-  return \"tst%.l %0\;jmi %l1\";
+  return \"jmi %l1\";
 #endif
 } ")
 
-- 
2.30.2