mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-25 04:02:41 +01:00
2d74f410d9
This is a follow-up to the previous patch that eliminated some of the rotates. With this addition, we will also emit the record-form andis. This patch increases the number of record-form rotates we eliminate by more than 70%. Differential revision: https://reviews.llvm.org/D44897 llvm-svn: 342478
141 lines
3.6 KiB
LLVM
141 lines
3.6 KiB
LLVM
; RUN: llc -O2 -o - %s | FileCheck %s
|
|
target datalayout = "e-m:e-i64:64-n32:64"
|
|
target triple = "powerpc64le-grtev4-linux-gnu"
|
|
|
|
; Intended layout:
|
|
; The code for tail-duplication during layout will produce the layout:
|
|
; test1
|
|
; test2
|
|
; body1 (with copy of test2)
|
|
; body2
|
|
; exit
|
|
|
|
;CHECK-LABEL: tail_dup_break_cfg:
|
|
;CHECK: mr [[TAGREG:[0-9]+]], 3
|
|
;CHECK: andi. {{[0-9]+}}, [[TAGREG]], 1
|
|
;CHECK-NEXT: bc 12, 1, [[BODY1LABEL:[._0-9A-Za-z]+]]
|
|
;CHECK-NEXT: # %test2
|
|
;CHECK-NEXT: andi. {{[0-9]+}}, [[TAGREG]], 2
|
|
;CHECK-NEXT: bne 0, [[BODY2LABEL:[._0-9A-Za-z]+]]
|
|
;CHECK: [[EXITLABEL:[._0-9A-Za-z]+]]: # %exit
|
|
;CHECK: blr
|
|
;CHECK-NEXT: [[BODY1LABEL]]
|
|
;CHECK: andi. {{[0-9]+}}, [[TAGREG]], 2
|
|
;CHECK-NEXT: beq 0, [[EXITLABEL]]
|
|
;CHECK-NEXT: [[BODY2LABEL:[._0-9A-Za-z]+]]:
|
|
;CHECK: b [[EXITLABEL]]
|
|
define void @tail_dup_break_cfg(i32 %tag) {
|
|
entry:
|
|
br label %test1
|
|
test1:
|
|
%tagbit1 = and i32 %tag, 1
|
|
%tagbit1eq0 = icmp eq i32 %tagbit1, 0
|
|
br i1 %tagbit1eq0, label %test2, label %body1, !prof !1 ; %test2 more likely
|
|
body1:
|
|
call void @a()
|
|
call void @a()
|
|
call void @a()
|
|
call void @a()
|
|
br label %test2
|
|
test2:
|
|
%tagbit2 = and i32 %tag, 2
|
|
%tagbit2eq0 = icmp eq i32 %tagbit2, 0
|
|
br i1 %tagbit2eq0, label %exit, label %body2, !prof !1 ; %exit more likely
|
|
body2:
|
|
call void @b()
|
|
call void @b()
|
|
call void @b()
|
|
call void @b()
|
|
br label %exit
|
|
exit:
|
|
ret void
|
|
}
|
|
|
|
; The branch weights here hint that we shouldn't tail duplicate in this case.
|
|
;CHECK-LABEL: tail_dup_dont_break_cfg:
|
|
;CHECK: mr [[TAGREG:[0-9]+]], 3
|
|
;CHECK: andi. {{[0-9]+}}, [[TAGREG]], 1
|
|
;CHECK-NEXT: bc 4, 1, [[TEST2LABEL:[._0-9A-Za-z]+]]
|
|
;CHECK-NEXT: # %body1
|
|
;CHECK: [[TEST2LABEL]]: # %test2
|
|
;CHECK-NEXT: andi. {{[0-9]+}}, [[TAGREG]], 2
|
|
;CHECK-NEXT: beq 0, [[EXITLABEL:[._0-9A-Za-z]+]]
|
|
;CHECK-NEXT: # %body2
|
|
;CHECK: [[EXITLABEL:[._0-9A-Za-z]+]]: # %exit
|
|
;CHECK: blr
|
|
define void @tail_dup_dont_break_cfg(i32 %tag) {
|
|
entry:
|
|
br label %test1
|
|
test1:
|
|
%tagbit1 = and i32 %tag, 1
|
|
%tagbit1eq0 = icmp eq i32 %tagbit1, 0
|
|
br i1 %tagbit1eq0, label %test2, label %body1, !prof !1 ; %test2 more likely
|
|
body1:
|
|
call void @a()
|
|
call void @a()
|
|
call void @a()
|
|
call void @a()
|
|
br label %test2
|
|
test2:
|
|
%tagbit2 = and i32 %tag, 2
|
|
%tagbit2eq0 = icmp ne i32 %tagbit2, 0
|
|
br i1 %tagbit2eq0, label %body2, label %exit, !prof !3 ; %body2 more likely
|
|
body2:
|
|
call void @b()
|
|
call void @b()
|
|
call void @b()
|
|
call void @b()
|
|
br label %exit
|
|
exit:
|
|
ret void
|
|
}
|
|
declare void @a()
|
|
declare void @b()
|
|
declare void @c()
|
|
declare void @d()
|
|
|
|
; This function arranges for the successors of %succ to have already been laid
|
|
; out. When we consider whether to lay out succ after bb and to tail-duplicate
|
|
; it, v and ret have already been placed, so we tail-duplicate as it removes a
|
|
; branch and strictly increases fallthrough
|
|
; CHECK-LABEL: tail_dup_no_succ
|
|
; CHECK: # %entry
|
|
; CHECK: # %v
|
|
; CHECK: # %ret
|
|
; CHECK: # %bb
|
|
; CHECK: # %succ
|
|
; CHECK: # %c
|
|
; CHECK: bl c
|
|
; CHECK: andi. {{[0-9]+}}, {{[0-9]+}}, 4
|
|
; CHECK: beq
|
|
; CHECK: b
|
|
define void @tail_dup_no_succ(i32 %tag) {
|
|
entry:
|
|
%tagbit1 = and i32 %tag, 1
|
|
%tagbit1eq0 = icmp eq i32 %tagbit1, 0
|
|
br i1 %tagbit1eq0, label %v, label %bb, !prof !2 ; %v very much more likely
|
|
bb:
|
|
%tagbit2 = and i32 %tag, 2
|
|
%tagbit2eq0 = icmp eq i32 %tagbit2, 0
|
|
br i1 %tagbit2eq0, label %succ, label %c, !prof !3 ; %succ more likely
|
|
c:
|
|
call void @c()
|
|
call void @c()
|
|
br label %succ
|
|
succ:
|
|
%tagbit3 = and i32 %tag, 4
|
|
%tagbit3eq0 = icmp eq i32 %tagbit3, 0
|
|
br i1 %tagbit3eq0, label %ret, label %v, !prof !1 ; %u more likely
|
|
v:
|
|
call void @d()
|
|
call void @d()
|
|
br label %ret
|
|
ret:
|
|
ret void
|
|
}
|
|
|
|
|
|
!1 = !{!"branch_weights", i32 5, i32 3}
|
|
!2 = !{!"branch_weights", i32 95, i32 5}
|
|
!3 = !{!"branch_weights", i32 8, i32 3}
|