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Add a much more conservative strategy for aligning branch targets.

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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
This commit is contained in:
Chandler Carruth
2012-08-07 09:45:24 +00:00
parent ba86b13ad9
commit e6450dc2af
5 changed files with 59 additions and 21 deletions
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4
test/CodeGen/X86/loop-blocks.ll
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@@ -41,7 +41,6 @@ done:
; CHECK-NEXT: align
; CHECK-NEXT: .LBB1_4:
; CHECK-NEXT: callq bar99
; CHECK-NEXT: align
; CHECK-NEXT: .LBB1_1:
; CHECK-NEXT: callq body
@@ -79,7 +78,6 @@ exit:
; CHECK-NEXT: .LBB2_5:
; CHECK-NEXT: callq block_a_true_func
; CHECK-NEXT: callq block_a_merge_func
; CHECK-NEXT: align
; CHECK-NEXT: .LBB2_1:
; CHECK-NEXT: callq body
;
@@ -139,13 +137,13 @@ exit:
; CHECK-NEXT: align
; CHECK-NEXT: .LBB3_7:
; CHECK-NEXT: callq bar100
; CHECK-NEXT: align
; 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