https://bugs.llvm.org/show_bug.cgi?id=47242
Bug ID: 47242
Summary: missed instruction sink across asm goto
Product: clang
Version: unspecified
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: C
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected],
[email protected], [email protected],
[email protected], [email protected]
Blocks: 4068
I was looking at a bug report against GCC 8
(https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90193), and noticed our codegen
could be improved: https://godbolt.org/z/zqK1K7. I was wondering if we could
sink the zeroing of the return register after the asm statement, so that we're
avoiding a dead write along one of the branches?
Referenced Bugs:
https://bugs.llvm.org/show_bug.cgi?id=4068
[Bug 4068] [Meta] Compiling the Linux kernel with clang
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