🚀 go-pugleaf

We are using gcc-2.3.1 as a cross-compiler, the host is sparc and the target
is mips.  We are using a modified version of the OSF assembler.  In the 
following example you will find a missing nop before the coprocessor 
instruction, mtc2.  I would like to see the compiler issue a nop after
the	
	"lw	$2,y" 

just as it does for the

	"lw      $3,z"

		Marvin Wyckoff
		Tektronix, Inc.
		503-685-2985

/* ------------------------ asm2.c ------------------------ */
#define MTC2(src, reg)  _MTC2(src, reg)
#define _MTC2(src, reg) \
  { asm volatile ("mtc2 %0,"#reg"" : : "r" ((unsigned long) (src))); }
int y,z;
main()
{
	int x;

	x = y;
	MTC2(x,$3);
	y += z;
}
/* ------------------------ asm2.c ------------------------ */
Script started on Thu Nov 12 14:11:49 1992
intrepid% uname -a
SunOS intrepid 4.1A.1 4.1.1 sun4
intrepid% cat ~/gnu/gcc-2.3.1/sparc-mips/config.status
#!/bin/sh
# GCC was configured as follows:
../configure --host=sparc --target=mips-mips-bsd
echo host=sparc-sun-sunos4.1.1 target=mips-mips-bsd build=sparc-sun-sunos4.1.1
intrepid% ~/nwd/tools/sparc/bin/mgcc -O2 -S -v asm2.c
gcc version 2.3.1
 /home/marvinw/nwd/tools/sparc/lib/gcc-lib/mips-mips-bsd/2.3.1/cpp -lang-c -v -undef -D__GNUC__=2 -Dmips -Dunix -Dhost_mips -DMIPSEB -DR3000 -DSYSTYPE_BSD43 -D_mips -D_unix -D_host_mips -D_MIPSEB -D_R3000 -D_SYSTYPE_BSD43 -D__mips__ -D__unix__ -D__host_mips__ -D__MIPSEB__ -D__R3000__ -D__SYSTYPE_BSD43__ -D___mips__ -D___unix__ -D___host_mips__ -D___MIPSEB__ -D___R3000__ -D___SYSTYPE_BSD43__ -D__mips -D__unix -D__host_mips -D__MIPSEB -D__R3000 -D__SYSTYPE_BSD43 -D___mips -D___unix -D___host_mips -D___MIPSEB


 -D___R3000 -D___SYSTYPE_BSD43 -D__OPTIMIZE__ -D__LANGUAGE_C -D_LANGUAGE_C -DLANGUAGE_C asm2.c /usr/tmp/cca13703.i
GNU CPP version 2.3.1 [AL 1.1, MM 28] BSD Mips
 /home/marvinw/nwd/tools/sparc/lib/gcc-lib/mips-mips-bsd/2.3.1/cc1 /usr/tmp/cca13703.i -mgas -mgpopt -quiet -dumpbase asm2.c -O2 -version -o asm2.s
GNU C version 2.3.1 [AL 1.1, MM 28] BSD Mips compiled by CC.
intrepid% cat asm2.s
	.file	1 "asm2.c"

 # GNU C 2.3.1 [AL 1.1, MM 28] BSD Mips compiled by CC

 # Cc1 defaults:

 # Cc1 arguments (-G value = 0, Cpu = default, ISA = 1):
 # -mgas -mgpopt -quiet -dumpbase -O2 -version -o

gcc2_compiled.:
	.text
	.align	2
	.globl	main

	.comm	y,8

	.comm	z,8

	.text

	.loc	1 6
	.ent	main
main:
	.frame	$sp,0,$31		# vars= 0, regs= 0/0, args = 0, extra= 0
	.mask	0x00000000,0
	.fmask	0x00000000,0
	.set	noreorder
	lw	$2,y
 #APP
	mtc2 $2,$3
 #NO_APP
	.set	reorder
	.set	noreorder
	lw	$3,z
	nop
	.set	reorder
	addu	$2,$2,$3
	sw	$2,y
	j	$31
	.end	main
intrepid% mas -o asm2.o asm2.s
intrepid% mdis asm2.o

asm2.o:     file format tekmips

Disassembly of section .text:
00000000  lw $v0,0($gp)
00000004  mtc2 $v0,$f3
00000008  lw $v1,0($gp)
0000000c  nop 
00000010  addu $v0,$v0,$v1
00000014  sw $v0,0($gp)
00000018  jr $ra
0000001c  nop