mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-23 11:13:28 +01:00
11fabb62e9
When we're rematerializing into a not-quite-right register we already add the real definition as an imp-def, but we should also be marking the "official" register as dead, since nothing else is going to use it as a result of this remat. Not doing this can affect pressure tracking. rdar://problem/14158833 llvm-svn: 184002
24 lines
812 B
LLVM
24 lines
812 B
LLVM
; REQUIRES: asserts
|
|
; RUN: llc -mtriple=x86_64-apple-darwin -debug -o /dev/null < %s 2>&1 | FileCheck %s
|
|
|
|
; We need to make sure that rematerialization into a physical register marks the
|
|
; super- or sub-register as dead after this rematerialization since only the
|
|
; original register is actually used later. Largely irrelevant for a trivial
|
|
; example like this, since EAX is never used again, but easy to test.
|
|
|
|
define i8 @test_remat() {
|
|
ret i8 0
|
|
; CHECK: REGISTER COALESCING
|
|
; CHECK: Remat: %EAX<def,dead> = MOV32r0 %EFLAGS<imp-def,dead>, %AL<imp-def>
|
|
}
|
|
|
|
; On the other hand, if it's already the correct width, we really shouldn't be
|
|
; marking the definition register as dead.
|
|
|
|
define i32 @test_remat32() {
|
|
ret i32 0
|
|
; CHECK: REGISTER COALESCING
|
|
; CHECK: Remat: %EAX<def> = MOV32r0 %EFLAGS<imp-def,dead>
|
|
}
|
|
|