topic Compiler errors occurs when emitting 32bit binaries in Intel® oneAPI DPC++/C++ Compiler

Compiler errors occurs when emitting 32bit binaries

hyungseok — Wed, 12 Jun 2024 05:10:54 GMT

I discovered that the latest x86-64 ICX 2024.0.0 emits invalid registers when it generates x86 binaries.

This error has been identified in 2 opcodes.

Buggy code.

```

void bug(int num) {

__asm__(

".intel_syntax noprefix\n"

"enqcmd SP, ZMMWORD PTR [EAX]\n"

"enqcmds SP, ZMMWORD PTR [EAX]\n"

);

}

```

Compile Option: -m32

Compiled code

```

bug:

push ebp

mov ebp,esp

mov eax,DWORD PTR [ebp+0x8]

enqcmd sp,[bx+si]

enqcmds sp,[bx+si]

pop ebp

ret

```

I tested it through godbolt.

https://godbolt.org/z/TqEKnrTYj

Re: Compiler errors occurs when emitting 32bit binaries

Alex_Y_Intel — Tue, 18 Jun 2024 05:52:19 GMT

Your question has been escalated to our internal team.

Re: Compiler errors occurs when emitting 32bit binaries

Alex_Y_Intel — Fri, 21 Jun 2024 21:16:59 GMT

2024.2 compiler will soon be released, please try it with the newer compiler.

Re:Compiler errors occurs when emitting 32bit binaries

Alex_Y_Intel — Fri, 12 Jul 2024 19:31:20 GMT

The issues had been fixed in 2024.2.

"SP" in the original reproducer should be changed to "ESP" to be able to compile successfully with compiler 2024.2:

repro.c

void bug(int num)

{

__asm__(

".intel_syntax noprefix\n"

"enqcmd ESP, ZMMWORD PTR [EAX]\n"

"enqcmds ESP, ZMMWORD PTR [EAX]\n"

);

}

icx -m32 repro.c -S

Assembly output:

.text

.file "repro.c"

.globl bug # -- Begin function bug

.p2align 4, 0x90

.type bug,@function

bug: #

.cfi_startproc

# %bb.0:

#APP

enqcmd (%eax), %esp

enqcmds (%eax), %esp

#NO_APP

retl

.Lfunc_end0:

.size bug, .Lfunc_end0-bug

.cfi_endproc

# -- End function

.ident "Intel(R) oneAPI DPC++/C++ Compiler 2024.2.0 (2024.2.0.20240602)"

.section ".note.GNU-stack","",@progbits

Re: Compiler errors occurs when emitting 32bit binaries

Alex_Y_Intel — Fri, 12 Jul 2024 22:25:27 GMT

Please also note that 32-bit support has been deprecated.