RISC-V: Fix .align handling when .option norelax.

gas/
	PR gas/23219
	* config/tc-riscv.c (riscv_frag_align_code): Move frag_more call after
	!riscv_opts.relax check.
	(riscv_handle_align): Rewrite !riscv_opts.relax support.
	* config/tc-riscv (MAX_MEM_FOR_RS_ALIGN_CODE): Update.
	* testsuite/gas/riscv/no-relax-align.d: New
	* testsuite/gas/riscv/no-relax-align.s: New
	* testsuite/gas/riscv/no-relax-align-2.d: New
	* testsuite/gas/riscv/no-relax-align-2.s: New

gas/ChangeLog

@@ -1,3 +1,15 @@
+2018-05-24  Jim Wilson  <jimw@sifive.com>
+
+	PR gas/23219
+	* config/tc-riscv.c (riscv_frag_align_code): Move frag_more call after
+	!riscv_opts.relax check.
+	(riscv_handle_align): Rewrite !riscv_opts.relax support.
+	* config/tc-riscv (MAX_MEM_FOR_RS_ALIGN_CODE): Update.
+	* testsuite/gas/riscv/no-relax-align.d: New
+	* testsuite/gas/riscv/no-relax-align.s: New
+	* testsuite/gas/riscv/no-relax-align-2.d: New
+	* testsuite/gas/riscv/no-relax-align-2.s: New
+
 2018-05-21  Peter Bergner  <bergner@vnet.ibm.com.com>
 
 	* config/tc-ppc.c (md_assemble): Delete handling of fake operands.

gas/config/tc-riscv.c

@@ -2756,12 +2756,12 @@ riscv_frag_align_code (int n)
   if (bytes <= insn_alignment)
     return TRUE;
 
-  nops = frag_more (worst_case_bytes);
-
   /* When not relaxing, riscv_handle_align handles code alignment.  */
   if (!riscv_opts.relax)
     return FALSE;
 
+  nops = frag_more (worst_case_bytes);
+
   ex.X_op = O_constant;
   ex.X_add_number = worst_case_bytes;
 
@@ -2784,15 +2784,27 @@ riscv_handle_align (fragS *fragP)
       /* When relaxing, riscv_frag_align_code handles code alignment.  */
       if (!riscv_opts.relax)
 	{
-	  bfd_signed_vma count = fragP->fr_next->fr_address
+	  bfd_signed_vma bytes = (fragP->fr_next->fr_address
-				 - fragP->fr_address - fragP->fr_fix;
+				  - fragP->fr_address - fragP->fr_fix);
+	  /* We have 4 byte uncompressed nops.  */
+	  bfd_signed_vma size = 4;
+	  bfd_signed_vma excess = bytes % size;
+	  char *p = fragP->fr_literal + fragP->fr_fix;
 
-	  if (count <= 0)
+	  if (bytes <= 0)
 	    break;
 
-	  count &= MAX_MEM_FOR_RS_ALIGN_CODE;
+	  /* Insert zeros or compressed nops to get 4 byte alignment.  */
-	  riscv_make_nops (fragP->fr_literal + fragP->fr_fix, count);
+	  if (excess)
-	  fragP->fr_var = count;
+	    {
+	      riscv_make_nops (p, excess);
+	      fragP->fr_fix += excess;
+	      p += excess;
+	    }
+
+	  /* Insert variable number of 4 byte uncompressed nops.  */
+	  riscv_make_nops (p, size);
+	  fragP->fr_var = size;
 	}
       break;
 

gas/config/tc-riscv.h

@@ -62,7 +62,7 @@ extern bfd_boolean riscv_frag_align_code (int);
 extern void riscv_handle_align (fragS *);
 #define HANDLE_ALIGN riscv_handle_align
 
-#define MAX_MEM_FOR_RS_ALIGN_CODE 7
+#define MAX_MEM_FOR_RS_ALIGN_CODE (3 + 4)
 
 /* The ISA of the target may change based on command-line arguments.  */
 #define TARGET_FORMAT riscv_target_format()

gas/testsuite/gas/riscv/no-relax-align-2.d

@@ -0,0 +1,19 @@
+#as:
+#objdump: -dr
+
+.*:[ 	]+file format .*
+
+
+Disassembly of section .text:
+
+0+000 <.text>:
+[ 	]+0:[ 	]+0000[ 	]+unimp
+[ 	]+2:[ 	]+0001[ 	]+nop
+[ 	]+4:[ 	]+00000013[ 	]+nop
+[ 	]+8:[ 	]+00000013[ 	]+nop
+[ 	]+c:[ 	]+00000013[ 	]+nop
+[ 	]+10:[ 	]+0001[ 	]+nop
+[ 	]+12:[ 	]+0001[ 	]+nop
+[ 	]+14:[ 	]+00000013[ 	]+nop
+[ 	]+18:[ 	]+00000013[ 	]+nop
+[ 	]+1c:[ 	]+00000013[ 	]+nop

gas/testsuite/gas/riscv/no-relax-align-2.s

@@ -0,0 +1,5 @@
+	.option norelax
+	.option rvc
+	.byte 0
+	.align 4
+	nop

gas/testsuite/gas/riscv/no-relax-align.d

@@ -0,0 +1,13 @@
+#as:
+#objdump: -dr
+
+.*:[ 	]+file format .*
+
+
+Disassembly of section .text:
+
+0+000 <.text>:
+[ 	]+0:[ 	]+00000013[ 	]+nop
+[ 	]+4:[ 	]+00000013[ 	]+nop
+[ 	]+8:[ 	]+00000013[ 	]+nop
+[ 	]+c:[ 	]+00000013[ 	]+nop

gas/testsuite/gas/riscv/no-relax-align.s

@@ -0,0 +1,4 @@
+	.option norelax
+	.align 4
+	nop
+	nop