https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107027
Bug ID: 107027
Summary: Please improve the documentation of global register
variables
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: segher at gcc dot gnu.org
Target Milestone: ---
The semantics of global register variables are a strict superset of the
semantics
of local register variables, but this isn't clearly documented. Having a
global
register variable as operand to an extended inline asm guarantees the register
declared for the register variable is used in the asm, it never is copied to a
temporary or similar.
