[LoongArch] Enable GCC C Torture Suite

[SixWeining]

Summary

Add built-in-setjmp.c and pr84521.c to blacklist because LoongArch
backend doesn't support __builtin_longjmp/__builtin_setjmp for now.

Like Mips and SystemZ, LoongArch supports lowering RETURNADDR and
FRAMEADDR for a current frame only. 20030323-1.c invokes
__builtin_return_address with non-zero argument. So add it to
blacklist.

Depends on D138102

[xen0n]

Seems we've reached some significant milestone? ;-)

I've fixed the formatting of the patch summary (marking the double-underscore identifiers as inline code so they don't get incorrectly italicized). The changes LGTM but let's wait for others.

[SixWeining]

In D138103#3929945, @xen0n wrote:

Seems we've reached some significant milestone? ;-)

I've fixed the formatting of the patch summary (marking the double-underscore identifiers as inline code so they don't get incorrectly italicized). The changes LGTM but let's wait for others.

Yes. Now 100% tests passed under various opt levels including O0/O0-g/Os/O3 with this change.

Thanks for editting the summary. :)

SingleSource/Regression/C/CMakeLists.txt

 if(ARCH MATCHES "x86" OR ARCH MATCHES "riscv" OR
    ARCH MATCHES "SystemZ" OR ARCH MATCHES "Mips" OR
-   ARCH MATCHES "AArch64" OR ARCH MATCHES "ARM")
+   ARCH MATCHES "AArch64" OR ARCH MATCHES "ARM" OR
+   ARCH MATCHES "LoongArch")
   add_subdirectory(gcc-c-torture)
 endif()
 
 list(APPEND LDFLAGS -lm)
 list(APPEND CFLAGS -Wno-implicit-int)
 llvm_singlesource(PREFIX "Regression-C-")

SingleSource/Regression/C/gcc-c-torture/execute/CMakeLists.txt

if(NOT MIPS_IS_MIPS64_ENABLED)
     )
 
     list(APPEND MipsTestsToSkip ${Mips32TestsToSkip})
   endif()
 
   list(APPEND TestsToSkip ${MipsTestsToSkip})
 endif()
 
+# LoongArch Test Blacklist
+if(ARCH MATCHES "LoongArch")
+  file(GLOB LoongArchTestsToSkip CONFIGURE_DEPENDS
+    # No backend support for __builtin_longjmp/__builtin_setjmp
+    built-in-setjmp.c
+    pr84521.c
+    # Triggers "return address can be determined only for current frame"
+    20030323-1.c
+  )
+
+  list(APPEND TestsToSkip ${LoongArchTestsToSkip})
+endif()
+
 # RISC-V Test Blacklist
 if(ARCH MATCHES "riscv")
   file(GLOB RISCVTestsToSkip CONFIGURE_DEPENDS
     # No backend support for __builtin_longjmp/__builtin_setjmp
     built-in-setjmp.c
     pr84521.c
   )