Re: target/5107: ICE when building an ARM/Thumb cross compiler for/on HP-UX.

[Richard Earnshaw <rearnsha at arm dot com>]

The following reply was made to PR target/5107; it has been noted by GNATS.

From: Richard Earnshaw <rearnsha@arm.com>
To: Klaus.k.pedersen@nokia.com
Cc: gcc-gnats@gcc.gnu.org, Richard.Earnshaw@arm.com
Subject: Re: target/5107: ICE when building an ARM/Thumb cross compiler 
 for/on HP-UX.
Date: Fri, 14 Dec 2001 10:53:25 +0000

 > I am trying to build an ARM/THUMB cross compiler on HP-UX 11 and
 > HP-UX 10.20. It doesn't work, even with the latest snapshot.
 
 Hmm, I built just the C compiler on our HPUX-11 machine and didn't see 
 this problem...
 
 
 > When xgcc is building the "thumb libgcc2" version of muldi3 it
 > stops with an internal error:
 > 
 > -------------
 > ../../gcc-20011203/gcc/libgcc2.c: In function `__muldi3':
 > ../../gcc-20011203/gcc/libgcc2.c:367: could not split insn
 > 
 > (insn 175 70 72 (set (reg:SI 2 r2)
 >         (const_int 65536 [0x10000])) 176 {*thumb_movsi_insn} (nil)
 >     (nil))
 
 The compiler certainly has a define_split that should match this (and that 
 is indeed what happens on the Sun dump you posted).
 
 > When you compare the dumps from the machines side-by-side, you
 > will notice that there are not a single pair that are equal !
 > -------------
 > coicxxx -> diff hp-dumps/libgcc2.i.00.rtl sun-dumps/libgcc2.i.00.rtl
 > 16c16
 > < (note 9 7 15 7bf703c0 NOTE_INSN_BLOCK_BEG)
 > ---
 > > (note 9 7 15 4003c0 NOTE_INSN_BLOCK_BEG)
 > 26c26
 > < (note 19 17 22 7bf70380 NOTE_INSN_BLOCK_BEG)
 > ---
 > > (note 19 17 22 400380 NOTE_INSN_BLOCK_BEG)
 > [...]
 
 These are pointers (don't know why they are useful, and yes, they do make 
 comparing across machines a pain).  So there isn't a problem here.  The 
 problem first shows up in dump 23 (ie some between postreload and flow2).  
 It's most likely in a "split_all_insns" pass, which should turn the pseudo 
 instruction
 
 	set r2 = 65536
 
 into the real thumb instructions
 
 	set r2 = 128
 	set r2 = r2 << 9
 
 
 > My configure string:
 > -------------
 > ../gcc-20011203/configure \
 >      --prefix=/opt/arm-elf-gcc --target=arm-elf --nfp \
 >      --enable-languages=c,c++ --with-dwarf2 --enable-target-optspace \
 >      --with-as=/opt/arm-elf-gcc/bin/arm-elf-as \
 >      --with-ld=/opt/arm-elf-gcc/bin/arm-elf-ld
 
 What *native* compiler where you using to build your cross-compiler? gcc? 
 if so, which version?  I used the HP compiler and as mentioned, didn't see 
 a problem (but that can't build the c++ compiler).