https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71519
Bug ID: 71519
Summary: "Out of range operand" bteqz inst generated by
"casesi_internal_mips16_<mode>"
Product: gcc
Version: 5.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: yszhou4tech at gmail dot com
Target Milestone: ---
There is a big switch statement in pcre_exec.c bundled with erlang 17.5. When
cross compiling it with GCC 5.3.0 with MIPS16 enabled, the generated assembly
code contains a bteqz instruction with out of range target label
```
mips-openwrt-linux-musl-gcc -c -Werror=return-type -Os -pipe -mno-branch-likely
-mips32r2 -mtune=24kc -g3 -fno-caller-saves -fno-plt -fhonour-copts
-Wno-error=unused-but-set-variable -Wno-error=unused-result -msoft-float
-mips16 -minterlink-mips16 -iremap
/home/yousong/git-repo/lede/build_dir/target-mips_24kc_musl-1.1.14/otp_src_17.5:otp_src_17.5
-Wformat -Werror=format-security -fstack-protector -D_FORTIFY_SOURCE=1
-Wl,-z,now -Wl,-z,relro -D_GNU_SOURCE
-I/home/yousong/git-repo/lede/build_dir/target-mips_24kc_musl-1.1.14/otp_src_17.5/erts/mips-openwrt-linux-gnu
-fno-tree-copyrename
-I/home/yousong/git-repo/lede/staging_dir/target-mips_24kc_musl-1.1.14/usr/include
-I/home/yousong/git-repo/lede/staging_dir/target-mips_24kc_musl-1.1.14/include
-I/home/yousong/git-repo/lede/staging_dir/toolchain-mips_24kc_gcc-5.3.0_musl-1.1.14/usr/include
-I/home/yousong/git-repo/lede/staging_dir/toolchain-mips_24kc_gcc-5.3.0_musl-1.1.14/include/fortify
-I/home/yousong/git-repo/lede/staging_dir/toolchain-mips_24kc_gcc-5.3.0_musl-1.1.14/include
-D_GNU_SOURCE -DHAVE_CONFIG_H -Wall -Wstrict-prototypes -Wmissing-prototypes
-Wdeclaration-after-statement -DUSE_THREADS -D_THREAD_SAFE -D_REENTRANT
-DPOSIX_THREADS -D_POSIX_THREAD_SAFE_FUNCTIONS -DERLANG_INTEGRATION -o
/home/yousong/git-repo/lede/build_dir/target-mips_24kc_musl-1.1.14/otp_src_17.5/erts/emulator/pcre/obj/mips-openwrt-linux-gnu/opt/pcre_exec.o
/home/yousong/git-repo/lede/build_dir/target-mips_24kc_musl-1.1.14/otp_src_17.5/erts/emulator/pcre/pcre_exec.c
{standard input}: Assembler messages:
{standard input}:1946: Error: operand value out of range for instruction
```
The generated code are like the following
```
1944 .loc 1 848 0
1945 sltu $2, 156
1946 bteqz $L125
1947 sll $3, $2, 2
1948 la $2, $L127
1949 addu $3, $2, $3
1950 lw $3, 0($3)
1951 addu $2, $2, $3
1952 j $2
1953 .align 2
1954 .align 2
1955 $L127:
1956 .word $L126-$L127
1957 .word $L128-$L127
1958 .word $L129-$L127
1959 .word $L130-$L127
1960 .word $L131-$L127
...
49207 $L125:
49208 $LBE2372 = .
49209 $LBB2374 = .
49210 .loc 1 6452 0
49211 lw $16,0($16)
49212 $LVL4091 = .
```
