When compiling the following code:
declare tailcc void @f1(i64, i64, i64, i64, i64, i64, i64)
define tailcc void @repro(i64, i64, i64, i64, i64, i64, i64) {
musttail call tailcc void @f1(i64 1, i64 4, i64 8, i64 15, i64 16, i64 23, i64 42)
ret void
}The 7th argument is not passed to function f1:
repro: # @repro
# %bb.0:
mov edi, 1
mov esi, 4
mov edx, 8
mov ecx, 15
mov r8d, 16
mov r9d, 23
jmp f1@PLT # TAILCALL
# -- End functionSee: https://godbolt.org/z/5z98T6fGx
In x86 (32-bit), only one argument is passed correctly, arguments 2-7 are dropped.
In LLVM 21 and before, the same code was compiled correctly:
repro: # @repro
# %bb.0:
mov qword ptr [rsp + 8], 42
mov edi, 1
mov esi, 4
mov edx, 8
mov ecx, 15
mov r8d, 16
mov r9d, 23
jmp f1@PLT # TAILCALL
# -- End function
When compiling the following code:
The 7th argument is not passed to function
f1:See: https://godbolt.org/z/5z98T6fGx
In
x86(32-bit), only one argument is passed correctly, arguments 2-7 are dropped.In LLVM 21 and before, the same code was compiled correctly: