mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-10-22 04:22:57 +02:00
096ba9c487
In the case of a conditional branch without a preceding cmp we used to emit a "and; cmp; b.eq/b.ne" sequence, use tbz/tbnz instead. Differential Revision: http://reviews.llvm.org/D15122 llvm-svn: 254621
91 lines
1.9 KiB
LLVM
91 lines
1.9 KiB
LLVM
; RUN: llc -mtriple=aarch64-apple-darwin -fast-isel -fast-isel-abort=1 -verify-machineinstrs < %s | FileCheck %s
|
|
|
|
; CHECK-LABEL: test_or
|
|
; CHECK: cbnz w0, {{LBB[0-9]+_2}}
|
|
; CHECK: cbz w1, {{LBB[0-9]+_1}}
|
|
define i64 @test_or(i32 %a, i32 %b) {
|
|
bb1:
|
|
%0 = icmp eq i32 %a, 0
|
|
%1 = icmp eq i32 %b, 0
|
|
%or.cond = or i1 %0, %1
|
|
br i1 %or.cond, label %bb3, label %bb4, !prof !0
|
|
|
|
bb3:
|
|
ret i64 0
|
|
|
|
bb4:
|
|
%2 = call i64 @bar()
|
|
ret i64 %2
|
|
}
|
|
|
|
; CHECK-LABEL: test_and
|
|
; CHECK: cbz w0, {{LBB[0-9]+_2}}
|
|
; CHECK: cbnz w1, {{LBB[0-9]+_3}}
|
|
define i64 @test_and(i32 %a, i32 %b) {
|
|
bb1:
|
|
%0 = icmp ne i32 %a, 0
|
|
%1 = icmp ne i32 %b, 0
|
|
%or.cond = and i1 %0, %1
|
|
br i1 %or.cond, label %bb4, label %bb3, !prof !1
|
|
|
|
bb3:
|
|
ret i64 0
|
|
|
|
bb4:
|
|
%2 = call i64 @bar()
|
|
ret i64 %2
|
|
}
|
|
|
|
; If the branch is unpredictable, don't add another branch.
|
|
|
|
; CHECK-LABEL: test_or_unpredictable
|
|
; CHECK: cmp w0, #0
|
|
; CHECK-NEXT: cset w8, eq
|
|
; CHECK-NEXT: cmp w1, #0
|
|
; CHECK-NEXT: cset w9, eq
|
|
; CHECK-NEXT: orr w8, w8, w9
|
|
; CHECK-NEXT: tbnz w8, #0,
|
|
define i64 @test_or_unpredictable(i32 %a, i32 %b) {
|
|
bb1:
|
|
%0 = icmp eq i32 %a, 0
|
|
%1 = icmp eq i32 %b, 0
|
|
%or.cond = or i1 %0, %1
|
|
br i1 %or.cond, label %bb3, label %bb4, !unpredictable !2
|
|
|
|
bb3:
|
|
ret i64 0
|
|
|
|
bb4:
|
|
%2 = call i64 @bar()
|
|
ret i64 %2
|
|
}
|
|
|
|
; CHECK-LABEL: test_and_unpredictable
|
|
; CHECK: cmp w0, #0
|
|
; CHECK-NEXT: cset w8, ne
|
|
; CHECK-NEXT: cmp w1, #0
|
|
; CHECK-NEXT: cset w9, ne
|
|
; CHECK-NEXT: and w8, w8, w9
|
|
; CHECK-NEXT: tbz w8, #0,
|
|
define i64 @test_and_unpredictable(i32 %a, i32 %b) {
|
|
bb1:
|
|
%0 = icmp ne i32 %a, 0
|
|
%1 = icmp ne i32 %b, 0
|
|
%or.cond = and i1 %0, %1
|
|
br i1 %or.cond, label %bb4, label %bb3, !unpredictable !2
|
|
|
|
bb3:
|
|
ret i64 0
|
|
|
|
bb4:
|
|
%2 = call i64 @bar()
|
|
ret i64 %2
|
|
}
|
|
|
|
declare i64 @bar()
|
|
|
|
!0 = !{!"branch_weights", i32 5128, i32 32}
|
|
!1 = !{!"branch_weights", i32 1024, i32 4136}
|
|
!2 = !{}
|
|
|