From: Gavin Romig-Koch <gavin@redhat.com>
Date: Tue, 29 Dec 1998 15:46:59 +0000 (+0000)
Subject: 	* config/tc-mips.c (append_insn): For mips16, insert a nop between
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=2e23624e62d1b5a1967deee01b59755fd396762d;p=binutils-gdb.git

	* config/tc-mips.c (append_insn): For mips16, insert a nop between
	a read of HI or LO and an immediatly following branch.
---

diff --git a/gas/ChangeLog b/gas/ChangeLog
index 8b74eb28a8d..c3b7408cb86 100644
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,3 +1,8 @@
+1998-12-29  Gavin Romig-Koch  <gavin@cygnus.com>
+
+	* config/tc-mips.c (append_insn): For mips16, insert a nop between
+	a read of HI or LO and an immediatly following branch.
+
 1998-12-29  Gavin Romig-Koch  <gavin@cygnus.com>
 
 	* config/tc-mips.c (md_begin): Another correction to the setting of
diff --git a/gas/config/tc-mips.c b/gas/config/tc-mips.c
index a2e1afe3c4b..26b12e30cb8 100644
--- a/gas/config/tc-mips.c
+++ b/gas/config/tc-mips.c
@@ -1689,6 +1689,16 @@ append_insn (place, ip, address_expr, reloc_type, unmatched_hi)
 	      && (mips_optimize == 0
 		  || (pinfo & INSN_WRITE_LO)))
 	    nops += 2;
+	  /* Most mips16 branch insns don't have a delay slot.
+	     If a read from LO is immediately followed by a branch
+	     to a write to LO we have a read followed by a write
+	     less than 2 insns away.  We assume the target of
+	     a branch might be a write to LO, and insert a nop
+	     between a read and an immediately following branch. */
+	  else if (mips_opts.mips16
+		   && (mips_optimize == 0
+		       || (pinfo & MIPS16_INSN_BRANCH)))
+	    nops += 1;
 	}
       else if (prev_insn.insn_mo->pinfo & INSN_READ_HI)
 	{
@@ -1701,6 +1711,16 @@ append_insn (place, ip, address_expr, reloc_type, unmatched_hi)
 	      && (mips_optimize == 0
 		  || (pinfo & INSN_WRITE_HI)))
 	    nops += 2;
+	  /* Most mips16 branch insns don't have a delay slot.
+	     If a read from HI is immediately followed by a branch
+	     to a write to HI we have a read followed by a write
+	     less than 2 insns away.  We assume the target of
+	     a branch might be a write to HI, and insert a nop
+	     between a read and an immediately following branch. */
+	  else if (mips_opts.mips16
+		   && (mips_optimize == 0
+		       || (pinfo & MIPS16_INSN_BRANCH)))
+	    nops += 1;
 	}
 
       /* If the previous instruction was in a noreorder section, then