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llvm-mirror/test/CodeGen/PowerPC/named-reg-alloc-r2-64.ll
Hal Finkel d9936757cf [PowerPC] Make r2 allocatable on PPC64/ELF for some leaf functions
The TOC base pointer is passed in r2, and we normally reserve this register so
that we can depend on it being there. However, for leaf functions, and
specifically those leaf functions that don't do any TOC access of their own
(which is generally due to accessing the constant pool, using TLS, etc.),
we can treat r2 as an ordinary callee-saved register (it must be callee-saved
because, for local direct calls, the linker will not insert any save/restore
code).

The allocation order has been changed slightly for PPC64/ELF systems to put r2
at the end of the list (while leaving it near the beginning for Darwin systems
to prevent unnecessary output changes). While r2 is allocatable, using it still
requires spill/restore traffic, and thus comes at the end of the list.

llvm-svn: 227745
2015-02-01 15:03:28 +00:00

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444 B
LLVM

; RUN: not llc < %s -mtriple=powerpc64-apple-darwin 2>&1 | FileCheck %s
; RUN: not llc < %s -mtriple=powerpc64-unknown-linux-gnu 2>&1 | FileCheck %s
define i64 @get_reg() nounwind {
entry:
; FIXME: Include an allocatable-specific error message
; CHECK: Invalid register name global variable
%reg = call i64 @llvm.read_register.i64(metadata !0)
ret i64 %reg
}
declare i64 @llvm.read_register.i64(metadata) nounwind
!0 = !{!"r2\00"}