https://bugs.llvm.org/show_bug.cgi?id=45435
Bug ID: 45435
Summary: Compilation error when using -save-temps -masm=intel
Product: clang
Version: 10.0
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: Frontend
Assignee: unassignedclangb...@nondot.org
Reporter: peterwarrenfr...@gmail.com
CC: llvm-bugs@lists.llvm.org, neeil...@live.com,
richard-l...@metafoo.co.uk
Created attachment 23311
--> https://bugs.llvm.org/attachment.cgi?id=23311&action=edit
A zip file containing the original C code, cut-down preprocessed version, and
generated assembly.
Hi,
When compiling C with the clang frontend using -save-temps -masm=intel it seems
to think the following x86 assembly it generates is invalid when it comes to
assembling it.
$ clang -save-temps -masm=intel -c -o hello_world.o hello_world.i
hello_world.s:18:16: error: invalid base+index expression
mov qword ptr [ST], rax
$ clang -save-temps -masm=att -c -o hello_world.o hello_world.i
** no errors, compiles fine**
$ clang -masm=intel -c -o hello_world.o hello_world.i
** no errors, compiles fine**
ST is a file-level declared pointer to a typedef struct, although if I change
ST to be declared within the scope of the function I do not get a compilation
error because clang just puts it in the stack instead of trying to reference a
symbol called ST.
The hello_world.i file is the preprocessed version of the original file
(hello_world.c), that I've trimmed down to be as small as possible to
demonstrate the bug.
I've tried this with clang 9.0 and 10.0 and both seem to show the same error.
If you want more context on this code I found this while working on this
project
https://github.com/badcf00d/bare-bones-uefi/tree/clang-save-temps-intel-bug.
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