mirror of
https://github.com/RPCS3/llvm.git
synced 2024-11-25 04:39:51 +00:00
e6450dc2af
Previously, MBP essentially aligned every branch target it could. This bloats code quite a bit, especially non-looping code which has no real reason to prefer aligned branch targets so heavily. As Andy said in review, it's still a bit odd to do this without a real cost model, but this at least has much more plausible heuristics. Fixes PR13265. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161409 91177308-0d34-0410-b5e6-96231b3b80d8
215 lines
4.6 KiB
LLVM
215 lines
4.6 KiB
LLVM
; RUN: llc < %s -march=x86-64 -mtriple=x86_64-unknown-linux-gnu -asm-verbose=false | FileCheck %s
|
|
|
|
; These tests check for loop branching structure, and that the loop align
|
|
; directive is placed in the expected place.
|
|
|
|
; CodeGen should insert a branch into the middle of the loop in
|
|
; order to avoid a branch within the loop.
|
|
|
|
; CHECK: simple:
|
|
; CHECK: jmp .LBB0_1
|
|
; CHECK-NEXT: align
|
|
; CHECK-NEXT: .LBB0_2:
|
|
; CHECK-NEXT: callq loop_latch
|
|
; CHECK-NEXT: .LBB0_1:
|
|
; CHECK-NEXT: callq loop_header
|
|
|
|
define void @simple() nounwind {
|
|
entry:
|
|
br label %loop
|
|
|
|
loop:
|
|
call void @loop_header()
|
|
%t0 = tail call i32 @get()
|
|
%t1 = icmp slt i32 %t0, 0
|
|
br i1 %t1, label %done, label %bb
|
|
|
|
bb:
|
|
call void @loop_latch()
|
|
br label %loop
|
|
|
|
done:
|
|
call void @exit()
|
|
ret void
|
|
}
|
|
|
|
; CodeGen should move block_a to the top of the loop so that it
|
|
; falls through into the loop, avoiding a branch within the loop.
|
|
|
|
; CHECK: slightly_more_involved:
|
|
; CHECK: jmp .LBB1_1
|
|
; CHECK-NEXT: align
|
|
; CHECK-NEXT: .LBB1_4:
|
|
; CHECK-NEXT: callq bar99
|
|
; CHECK-NEXT: .LBB1_1:
|
|
; CHECK-NEXT: callq body
|
|
|
|
define void @slightly_more_involved() nounwind {
|
|
entry:
|
|
br label %loop
|
|
|
|
loop:
|
|
call void @body()
|
|
%t0 = call i32 @get()
|
|
%t1 = icmp slt i32 %t0, 2
|
|
br i1 %t1, label %block_a, label %bb
|
|
|
|
bb:
|
|
%t2 = call i32 @get()
|
|
%t3 = icmp slt i32 %t2, 99
|
|
br i1 %t3, label %exit, label %loop
|
|
|
|
block_a:
|
|
call void @bar99()
|
|
br label %loop
|
|
|
|
exit:
|
|
call void @exit()
|
|
ret void
|
|
}
|
|
|
|
; Same as slightly_more_involved, but block_a is now a CFG diamond with
|
|
; fallthrough edges which should be preserved.
|
|
; "callq block_a_merge_func" is tail duped.
|
|
|
|
; CHECK: yet_more_involved:
|
|
; CHECK: jmp .LBB2_1
|
|
; CHECK-NEXT: align
|
|
; CHECK-NEXT: .LBB2_5:
|
|
; CHECK-NEXT: callq block_a_true_func
|
|
; CHECK-NEXT: callq block_a_merge_func
|
|
; CHECK-NEXT: .LBB2_1:
|
|
; CHECK-NEXT: callq body
|
|
;
|
|
; LBB2_4
|
|
; CHECK: callq bar99
|
|
; CHECK-NEXT: callq get
|
|
; CHECK-NEXT: cmpl $2999, %eax
|
|
; CHECK-NEXT: jle .LBB2_5
|
|
; CHECK-NEXT: callq block_a_false_func
|
|
; CHECK-NEXT: callq block_a_merge_func
|
|
; CHECK-NEXT: jmp .LBB2_1
|
|
|
|
define void @yet_more_involved() nounwind {
|
|
entry:
|
|
br label %loop
|
|
|
|
loop:
|
|
call void @body()
|
|
%t0 = call i32 @get()
|
|
%t1 = icmp slt i32 %t0, 2
|
|
br i1 %t1, label %block_a, label %bb
|
|
|
|
bb:
|
|
%t2 = call i32 @get()
|
|
%t3 = icmp slt i32 %t2, 99
|
|
br i1 %t3, label %exit, label %loop
|
|
|
|
block_a:
|
|
call void @bar99()
|
|
%z0 = call i32 @get()
|
|
%z1 = icmp slt i32 %z0, 3000
|
|
br i1 %z1, label %block_a_true, label %block_a_false
|
|
|
|
block_a_true:
|
|
call void @block_a_true_func()
|
|
br label %block_a_merge
|
|
|
|
block_a_false:
|
|
call void @block_a_false_func()
|
|
br label %block_a_merge
|
|
|
|
block_a_merge:
|
|
call void @block_a_merge_func()
|
|
br label %loop
|
|
|
|
exit:
|
|
call void @exit()
|
|
ret void
|
|
}
|
|
|
|
; CodeGen should move the CFG islands that are part of the loop but don't
|
|
; conveniently fit anywhere so that they are at least contiguous with the
|
|
; loop.
|
|
|
|
; CHECK: cfg_islands:
|
|
; CHECK: jmp .LBB3_1
|
|
; CHECK-NEXT: align
|
|
; CHECK-NEXT: .LBB3_7:
|
|
; CHECK-NEXT: callq bar100
|
|
; CHECK-NEXT: .LBB3_1:
|
|
; CHECK-NEXT: callq loop_header
|
|
; CHECK: jl .LBB3_7
|
|
; CHECK: jge .LBB3_3
|
|
; CHECK-NEXT: callq bar101
|
|
; CHECK-NEXT: jmp .LBB3_1
|
|
; CHECK-NEXT: align
|
|
; CHECK-NEXT: .LBB3_3:
|
|
; CHECK: jge .LBB3_4
|
|
; CHECK-NEXT: callq bar102
|
|
; CHECK-NEXT: jmp .LBB3_1
|
|
; CHECK-NEXT: .LBB3_4:
|
|
; CHECK: jl .LBB3_6
|
|
; CHECK-NEXT: callq loop_latch
|
|
; CHECK-NEXT: jmp .LBB3_1
|
|
; CHECK-NEXT: .LBB3_6:
|
|
|
|
define void @cfg_islands() nounwind {
|
|
entry:
|
|
br label %loop
|
|
|
|
loop:
|
|
call void @loop_header()
|
|
%t0 = call i32 @get()
|
|
%t1 = icmp slt i32 %t0, 100
|
|
br i1 %t1, label %block100, label %bb
|
|
|
|
bb:
|
|
%t2 = call i32 @get()
|
|
%t3 = icmp slt i32 %t2, 101
|
|
br i1 %t3, label %block101, label %bb1
|
|
|
|
bb1:
|
|
%t4 = call i32 @get()
|
|
%t5 = icmp slt i32 %t4, 102
|
|
br i1 %t5, label %block102, label %bb2
|
|
|
|
bb2:
|
|
%t6 = call i32 @get()
|
|
%t7 = icmp slt i32 %t6, 103
|
|
br i1 %t7, label %exit, label %bb3
|
|
|
|
bb3:
|
|
call void @loop_latch()
|
|
br label %loop
|
|
|
|
exit:
|
|
call void @exit()
|
|
ret void
|
|
|
|
block100:
|
|
call void @bar100()
|
|
br label %loop
|
|
|
|
block101:
|
|
call void @bar101()
|
|
br label %loop
|
|
|
|
block102:
|
|
call void @bar102()
|
|
br label %loop
|
|
}
|
|
|
|
declare void @bar99() nounwind
|
|
declare void @bar100() nounwind
|
|
declare void @bar101() nounwind
|
|
declare void @bar102() nounwind
|
|
declare void @body() nounwind
|
|
declare void @exit() nounwind
|
|
declare void @loop_header() nounwind
|
|
declare void @loop_latch() nounwind
|
|
declare i32 @get() nounwind
|
|
declare void @block_a_true_func() nounwind
|
|
declare void @block_a_false_func() nounwind
|
|
declare void @block_a_merge_func() nounwind
|