[llvm] [RISC-V][ISel] Remove redundant czero.eqz like 'czero.eqz a0, a0, a0' (PR #90208)

[Yingwei Zheng via llvm-commits]

dtcxzyw wrote:

> Sorry, is anyone know why the CI buildkite failed ? I can't run the build command `./.ci/monolithic-linux.sh "bolt;clang;clang-tools-extra;flang;lld;llvm;mlir;polly" "check-bolt check-clang check-clang-tools check-flang check-lld check-llvm check-mlir check-polly"` in my pc, and don't understand the error log as follow:
> 
> ```
> FAIL: BOLT :: RISCV/unnamed-sym-no-entry.c (55 of 431)
> 
> ******************** TEST 'BOLT :: RISCV/unnamed-sym-no-entry.c' FAILED ********************
> Exit Code: 1
> Command Output (stderr):
> RUN: at line 6: /usr/bin/clang  --target=x86_64-linux -fuse-ld=lld -Wl,--unresolved-symbols=ignore-all --target=riscv64 -nostdlib -ffreestanding -Wl,--emit-relocs -g -Wl,-q -o /var/lib/buildkite-agent/builds/linux-56-59b8f5d88-6mhbj-1/llvm-project/github-pull-requests/build/tools/bolt/test/RISCV/Output/unnamed-sym-no-entry.c.tmp /var/lib/buildkite-agent/builds/linux-56-59b8f5d88-6mhbj-1/llvm-project/github-pull-requests/bolt/test/RISCV/unnamed-sym-no-entry.c
> 
> + /usr/bin/clang --target=x86_64-linux -fuse-ld=lld -Wl,--unresolved-symbols=ignore-all --target=riscv64 -nostdlib -ffreestanding -Wl,--emit-relocs -g -Wl,-q -o /var/lib/buildkite-agent/builds/linux-56-59b8f5d88-6mhbj-1/llvm-project/github-pull-requests/build/tools/bolt/test/RISCV/Output/unnamed-sym-no-entry.c.tmp /var/lib/buildkite-agent/builds/linux-56-59b8f5d88-6mhbj-1/llvm-project/github-pull-requests/bolt/test/RISCV/unnamed-sym-no-entry.c
> 
> /var/lib/buildkite-agent/builds/linux-56-59b8f5d88-6mhbj-1/llvm-project/github-pull-requests/build/bin/llvm-readelf -s /var/lib/buildkite-agent/builds/linux-56-59b8f5d88-6mhbj-1/llvm-project/github-pull-requests/build/tools/bolt/test/RISCV/Output/unnamed-sym-no-entry.c.tmp | /var/lib/buildkite-agent/builds/linux-56-59b8f5d88-6mhbj-1/llvm-project/github-pull-requests/build/bin/FileCheck /var/lib/buildkite-agent/builds/linux-56-59b8f5d88-6mhbj-1/llvm-project/github-pull-requests/bolt/test/RISCV/unnamed-sym-no-entry.c --check-prefix=CHECK-ELF
> 
> /var/lib/buildkite-agent/builds/linux-56-59b8f5d88-6mhbj-1/llvm-project/github-pull-requests/build/bin/FileCheck /var/lib/buildkite-agent/builds/linux-56-59b8f5d88-6mhbj-1/llvm-project/github-pull-requests/bolt/test/RISCV/unnamed-sym-no-entry.c --check-prefix=CHECK-ELF
> 
> /var/lib/buildkite-agent/builds/linux-56-59b8f5d88-6mhbj-1/llvm-project/github-pull-requests/build/bin/llvm-readelf -s /var/lib/buildkite-agent/builds/linux-56-59b8f5d88-6mhbj-1/llvm-project/github-pull-requests/build/tools/bolt/test/RISCV/Output/unnamed-sym-no-entry.c.tmp
> 
> /var/lib/buildkite-agent/builds/linux-56-59b8f5d88-6mhbj-1/llvm-project/github-pull-requests/bolt/test/RISCV/unnamed-sym-no-entry.c:11:19: error: CHECK-ELF-DAG: expected string not found in input
> 
> CHECK-ELF-DAG: [[#%x,START]] {{.*}} NOTYPE LOCAL DEFAULT [[#SECTION]] .L0 {{$}}
> 
> ^
> <stdin>:1:1: note: scanning from here
> 
> <stdin>:1:1: note: with "%x,START" equal to "11120"
> 
> <stdin>:1:1: note: with "SECTION" equal to "1"
> 
> <stdin>:4:20: note: possible intended match here
> 
> 0: 0000000000000000 0 NOTYPE LOCAL DEFAULT UND 
> Input file: <stdin>
> 
> Check file: /var/lib/buildkite-agent/builds/linux-56-59b8f5d88-6mhbj-1/llvm-project/github-pull-requests/bolt/test/RISCV/unnamed-sym-no-entry.c
> 
> -dump-input=help explains the following input dump.
> 
> Input was:
> <<<<<<
> 1:  
> dag:11'0     X error: no match found
> dag:11'1      with "%x,START" equal to "11120"
> dag:11'2       with "SECTION" equal to "1"
> 2: Symbol table '.symtab' contains 32 entries: 
> dag:11'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 3:  Num: Value Size Type Bind Vis Ndx Name 
> dag:11'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 4:  0: 0000000000000000 0 NOTYPE LOCAL DEFAULT UND  
> dag:11'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> dag:11'3                        ?                              possible intended match
> 5:  1: 0000000000000000 0 FILE LOCAL DEFAULT ABS unnamed-sym-no-entry.c 
> dag:11'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 6:  2: 0000000000011120 0 NOTYPE LOCAL DEFAULT 1  
> 11'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 7:  3: 0000000000011120 0 NOTYPE LOCAL DEFAULT 1  
> dag:11'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 8:  4: 0000000000011120 0 NOTYPE LOCAL DEFAULT 1  
> dag:11'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 9:  5: 0000000000011122 0 NOTYPE LOCAL DEFAULT 1  
> dag:11'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> ********************
> ```

It is caused by https://github.com/llvm/llvm-project/pull/89693, which has been reverted. So don't worry about this :)


https://github.com/llvm/llvm-project/pull/90208