https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112855
Patrick O'Neill <patrick at rivosinc dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|[14] RISC-V vector: Appears |[14] RISC-V vector:
|to be overwriting stack arg |vsetivli clobbers variable
| |value
--- Comment #1 from Patrick O'Neill <patrick at rivosinc dot com> ---
lw a5,%lo(b)(a3)
load the value of b (100) into a5
vsetivli a5,5,e32,m1,ta,ma
clobbers the a5 regsiter which previously held b
addiw a1,a5,1
a5 is treated as b (this is the b++ statement)
sw a1,%lo(b)(a3)
and a1 (a5+1) is stored to b.
It appears like the compiler doesn't realize that vsetivli clobbers a5.
