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bootstrap/10453: Regression on FreeBSD/sparc64
- From: ak03 at gte dot com
- To: gcc-gnats at gcc dot gnu dot org
- Cc: pfeifer at dbai dot tuwien dot ac dot at, rittle at latour dot rsch dot comm dot mot dot com, obrien at FreeBSD dot ORG
- Date: Tue, 22 Apr 2003 10:39:02 -0400 (EDT)
- Subject: bootstrap/10453: Regression on FreeBSD/sparc64
>Number: 10453
>Category: bootstrap
>Synopsis: Critical regression on FreeBSD/sparc64, compiler not usable
>Confidential: no
>Severity: critical
>Priority: medium
>Responsible: unassigned
>State: open
>Class: ice-on-legal-code
>Submitter-Id: net
>Arrival-Date: Tue Apr 22 14:46:00 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator: Alexander N. Kabaev
>Release: 3.3 20030421 (prerelease)
>Organization:
FreeBSD Project
>Environment:
System: FreeBSD ork.gte.com 4.8-RC FreeBSD 4.8-RC #2: Mon Mar 24 11:00:40 EST 2003 ak03 at ork dot gte dot com:/usr/src/sys/compile/KAN i386
FreeBSD kanpc.gte.com 5.0-CURRENT FreeBSD 5.0-CURRENT #4: Wed Apr 16 18:23:28 EDT 2003 ak03 at kanpc dot gte dot com:/usr/src/sys/i386/compile/KANPC i386
host: i386-portbld-freebsd4.8
build: i386-portbld-freebsd4.8
target: i386-portbld-freebsd4.8
configured with: ./..//gcc-20030421/configure --disable-nls --with-gnu-as --with-gnu-ld --with-gxx-include-dir=/usr/local/lib/gcc-lib/i386-portbld-freebsd4.8/3.3/include/g++-v3 --with-system-zlib --disable-shared --prefix=/usr/local i386-portbld-freebsd4.8
>Description:
GCC 3.3 fails to bootstrap on FreeBSD and dies with ICE in expr.c:9408.
The reason for failure is quite convoluted:
1) sparc.md file defines mulsidi3 insn expansion which unconditionally
calls gen_const_mulsidi3_sp32 insn on non-V8PLUS targets.
2) const_mulsidi3_sp32 INSN has a TARGET_HARD_MUL32 condition.
3) TARGET_HARD_MUL32 condition is a compile time constant on FreeBSD:
#define TARGET_HARD_MUL32 \
((TARGET_V8 || TARGET_SPARCLITE \
|| TARGET_SPARCLET || TARGET_DEPRECATED_V8_INSNS) \
&& ! TARGET_V8PLUS && TARGET_ARCH32)
FreeBSD supports only 64-bit targets, so TARGET_ARCH32 is a compile
time constant 0 and '&&' makes the value of the TARGET_HARD_MUL32
constant known at compile time too.
4) Since the value for TARGET_HARD_MUL32 is known at compile time and
is 0, the newly added insn-conditions.c file will mark it as not-needed
and it will be raplaced with a stub, returning NULL.
5) Unconditional invocation in 1) will return NULL and GCC will die ICE.
>How-To-Repeat:
Bootstrap the compiler on FreeBSD/sparc64.
>Fix:
Only call gen_const_mulsidi3_sp32 if TARGET_ARCH32 is true. For
64-bit targets, call gen_const_mulsidi3_sp64 instead.
Index: sparc.md
===================================================================
RCS file: /usr/ncvs2/src/contrib/gcc/config/sparc/sparc.md,v
retrieving revision 1.1.1.9
diff -u -r1.1.1.9 sparc.md
--- sparc.md 3 Apr 2003 01:53:52 -0000 1.1.1.9
+++ sparc.md 22 Apr 2003 14:20:09 -0000
@@ -5289,9 +5289,12 @@
if (TARGET_V8PLUS)
emit_insn (gen_const_mulsidi3_v8plus (operands[0], operands[1],
operands[2]));
- else
+ else if (TARGET_ARCH32)
emit_insn (gen_const_mulsidi3_sp32 (operands[0], operands[1],
operands[2]));
+ else
+ emit_insn (gen_const_mulsidi3_sp64 (operands[0], operands[1],
+ operands[2]));
DONE;
}
if (TARGET_V8PLUS)
@@ -5495,8 +5498,11 @@
if (TARGET_V8PLUS)
emit_insn (gen_const_umulsidi3_v8plus (operands[0], operands[1],
operands[2]));
- else
+ else if (TARGET_ARCH32)
emit_insn (gen_const_umulsidi3_sp32 (operands[0], operands[1],
+ operands[2]));
+ else
+ emit_insn (gen_const_umulsidi3_sp64 (operands[0], operands[1],
operands[2]));
DONE;
}
>Release-Note:
>Audit-Trail:
>Unformatted: