8000 [MIPS] ICE: libgcc2.c:271:1: error: unrecognizable insn with -march=gs464 · Issue #40 · loongson-community/gcc · GitHub
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[MIPS] ICE: libgcc2.c:271:1: error: unrecognizable insn with -march=gs464 #40

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FlyGoat opened this issue Sep 29, 2018 · 5 comments
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[MIPS] ICE: libgcc2.c:271:1: error: unrecognizable insn with -march=gs464 #40

FlyGoat opened this issue Sep 29, 2018 · 5 comments
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FlyGoat commented Sep 29, 2018 
...
../../../libgcc/libgcc2.c: In function '__absvti2':
../../../libgcc/libgcc2.c:271:1: error: unrecognizable insn:
 }
 ^
(insn/f 68 67 69 4 (parallel [
            (set (mem/c:DI (plus:DI (reg/f:DI 29 $sp)
                        (const_int 8 [0x8])) [1  S8 A64])
                (reg:DI 31 $31))
            (set (mem/c:DI (reg/f:DI 29 $sp) [1  S8 A64])
                (reg:DI 28 $28))
        ]) "../../../libgcc/libgcc2.c":257 -1
     (expr_list:REG_DEAD (reg:DI 31 $31)
        (expr_list:REG_FRAME_RELATED_EXPR (parallel [
                    (set/f (mem/c:DI (plus:DI (reg/f:DI 29 $sp)
                                (const_int 8 [0x8])) [1  S8 A64])
                        (reg:DI 31 $31))
                    (set/f (mem/c:DI (reg/f:DI 29 $sp) [1  S8 A64])
                        (reg:DI 28 $28))
                ])
            (nil))))
during RTL pass: cprop_hardreg
../../../libgcc/libgcc2.c:271:1: internal compiler error: in extract_insn, at recog.c:2304

Can be reproduced if bootstrap GCC is newer than GCC-6.

Workaround by using GCC-5 or GCC-6 as bootstrap but we still have to find the root cause.
@FlyGoat FlyGoat added this to the gcc-8-branch milestone Sep 29, 2018
@FlyGoat FlyGoat self-assigned this Sep 29, 2018
@xiangzhai
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Workaround by using GCC-5

Verify bootstrap with gcc-5.5?

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FlyGoat commented Sep 29, 2018

Workaround by using GCC-5

Verify bootstrap with gcc-5.5?

Yes.. Built a cross toolchain.

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FlyGoat commented Sep 29, 2018

Maybe we can try build without libgcc and test via DejaGnu to locate the issue in to specific case?

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FlyGoat commented Sep 29, 2018

GCC configured as
../configure --target=mips64el-redhat-linux --prefix=/opt/godson-toolchain --with-arch=gs464 --with-abi=64 --disable-nls --disable-libatomic --disable-libgomp --disable-libmpx --disable-libquadmath --disable-libssp --disable-libvtv --disable-libstdcxx --disable-multilib --disable-decimal-float --disable-threads --disable-libatomic --disable-libgomp --disable-libmpx --disable-libquadmath --disable-libssp --disable-libvtv --disable-shared --disable-libgcc --enable-languages=c,c++

fails almost all the test with ICE... Bootstrap is GCC-8.2.1 on Archlinux...

@xiangzhai
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fails almost all the test with ICE... Bootstrap is GCC-8.2.1

emm... ditto! bootstrap with gcc-9-dev on fc25.x86_64

FlyGoat added a commit that referenced this issue Oct 14, 2018
@FlyGoat
Add missing 128-bit mem access instructions
b53a06e 
Patch from Chenghua Xu <xuchenghua@loongson.cn>
This sould solve: #40

Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
FlyGoat added a commit that referenced this issue Oct 14, 2018
@FlyGoat
Add missing 128-bit mem access instructions
280dd7e 
Patch from Chenghua Xu <xuchenghua@loongson.cn>
This sould solve: #40

Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
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