g++-1.34.2 generating bogus sparc assembler code

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2 total messages Started by "Stephen C. Pope" Wed, 05 Apr 1989 17:49

#1833

Author: "Stephen C. Pope"
Date: Wed, 05 Apr 1989 17:49

52 lines
2538 bytes

While trying to compile Lea's Matrix.4apr code, I ran into
the following problem.  I'm using g++-1.34.2, the Tuesday
afternoon distribution, along with a random patch or two
appearing after that distribution.  All on a Sun4 SunOS4.0.1,
and using the native assembler.

laotse% g++ -v -g -O -fchar-charconst  -I.  -fstrength-reduce -c  TriDiagMat.cc
g++ version 1.34.2
 /usr/local/lib/gcc-cpp -+ -v -I. -undef -D__GNU__ -D__GNUG__ -Dsparc -Dsun -Dunix -D__sparc__ -D__su
n__ -D__unix__ -D__OPTIMIZE__ TriDiagMat.cc /tmp/cca16931.cpp
GNU CPP version 1.34
 /usr/local/lib/gcc-c++ /tmp/cca16931.cpp -quiet -dumpbase TriDiagMat.cc -fchar-charconst -fstrength-
reduce -opt -version -G -o /tmp/cca16931.s
GNU C++ version 1.34.2 (sparc) compiled by GNU C version 1.34.
 as /tmp/cca16931.s -o TriDiagMat.o
as: "/tmp/cca16931.s", line 2169: error: statement syntax
as: "/tmp/cca16931.s", line 2425: error: statement syntax
as: "/tmp/cca16931.s", line 2862: error: statement syntax
as: "/tmp/cca16931.s", line 3312: error: statement syntax
as: "/tmp/cca16931.s", line 3762: error: statement syntax
as: "/tmp/cca16931.s", line 4212: error: statement syntax
as: "/tmp/cca16931.s", line 4662: error: statement syntax
as: "/tmp/cca16931.s", line 5112: error: statement syntax
as: "/tmp/cca16931.s", line 5483: error: statement syntax
as: "/tmp/cca16931.s", line 5651: error: statement syntax
as: "/tmp/cca16931.s", line 5881: error: statement syntax
as: "/tmp/cca16931.s", line 6376: error: statement syntax
as: "/tmp/cca16931.s", line 7109: error: statement syntax

(Investigating *only* the first error above!!!)
After looking at the .s output, I see that intructions of
the form

	mov	[%l1], %o2

are being generated.  The source line generating this is
in TriDiagMat.h:

inline double&  TriDiagMat::ref(int i, int j)
{
  return data[r * (j - i + 1) + j];    // this is the culprit here!
}

which is quite kosher.

All the other errors are due to the generation of similar
mov [%l?],%o? instructions.

Stephen Pope
The Santa Fe Institute
scp@sfi.santafe.edu

g++-1.34.2 generating bogus sparc assembler code

#1835

Author: Michael Tiemann
Date: Wed, 05 Apr 1989 18:20

33 lines
1322 bytes

I posted a fix to bug-gcc@prep.ai.mit.edu.  I should have CC'd to
bug-g++.  Here is the fix:

yahi% diff -c2 sparc.md~ sparc.md
*** sparc.md~	Mon Mar 27 09:37:42 1989
--- sparc.md	Tue Apr  4 09:01:36 1989
***************
*** 1496,1503 ****
    ""
    "*
!   return (GET_CODE (operands[1]) == CONST_INT
! 	  ? \"sethi %%hi(%1),%0\;or %%lo(%1),%0,%0\"
! 	  : \"mov %1,%0\");
! ")
  
  ;;- and instructions (with compliment also)			   
--- 1496,1506 ----
    ""
    "*
! {
!   if (GET_CODE (operands[1]) == MEM)
!     return \"ld %1,%0\";
!   if (REG_P (operands[1]) || small_int (operands[1]))
!     return \"mov %1,%0\";
!   return \"sethi %%hi(%1),%0\;or %%lo(%1),%0,%0\";
! }")
  
  ;;- and instructions (with compliment also)			   
yahi% 

Don't worry if the line numbers don't match up.

Michael

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