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[CodeGenPrepare] Generalize inserted set from truncs to any inst.

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It's been used before to avoid infinite loops caused by separate CGP
optimizations undoing one another.  We found one more such issue
caused by r238054.  To avoid it, generalize the "InsertedTruncs"
set to any inst, and use it to avoid touching those again.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@239938 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Ahmed Bougacha
2015-06-17 20:44:32 +00:00
parent 6fc90b32e3
commit 4412d4b51f
2 changed files with 44 additions and 21 deletions
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16
test/CodeGen/AArch64/arm64-atomic.ll
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@@ -14,6 +14,22 @@ define i32 @val_compare_and_swap(i32* %p, i32 %cmp, i32 %new) #0 {
ret i32 %val
}
define i32 @val_compare_and_swap_from_load(i32* %p, i32 %cmp, i32* %pnew) #0 {
; CHECK-LABEL: val_compare_and_swap_from_load:
; CHECK-NEXT: ldr [[NEW:w[0-9]+]], [x2]
; CHECK-NEXT: [[LABEL:.?LBB[0-9]+_[0-9]+]]:
; CHECK-NEXT: ldaxr [[RESULT:w[0-9]+]], [x0]
; CHECK-NEXT: cmp [[RESULT]], w1
; CHECK-NEXT: b.ne [[LABEL2:.?LBB[0-9]+_[0-9]+]]
; CHECK-NEXT: stxr [[SCRATCH_REG:w[0-9]+]], [[NEW]], [x0]
; CHECK-NEXT: cbnz [[SCRATCH_REG]], [[LABEL]]
; CHECK-NEXT: [[LABEL2]]:
%new = load i32, i32* %pnew
%pair = cmpxchg i32* %p, i32 %cmp, i32 %new acquire acquire
%val = extractvalue { i32, i1 } %pair, 0
ret i32 %val
}
define i32 @val_compare_and_swap_rel(i32* %p, i32 %cmp, i32 %new) #0 {
; CHECK-LABEL: val_compare_and_swap_rel:
; CHECK-NEXT: [[LABEL:.?LBB[0-9]+_[0-9]+]]: