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[ARM] Refactor the prologue/epilogue emission to be more robust.

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This is the first step toward supporting shrink-wrapping for this target.

The changes could be summarized by these items:
- Expand the tail-call return as part of the expand pseudo pass.
- Get rid of the assumptions that the epilogue is the exit block:
  * Do not assume which registers are free in the epilogue. (This indirectly
    improve the lowering of the code for the segmented stacks, see the test
    cases.)
  * Take into account that the basic block can be empty.

Related to <rdar://problem/20821730>


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@242714 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Quentin Colombet
2015-07-20 21:42:14 +00:00
parent c9f86c1260
commit b2dab382ce
8 changed files with 258 additions and 152 deletions
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4
test/CodeGen/ARM/fold-stack-adjust.ll
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@@ -170,9 +170,9 @@ define void @test_varsize(...) minsize {
; CHECK-T1: push {r5, r6, r7, lr}
; ...
; CHECK-T1: pop {r2, r3, r7}
; CHECK-T1: pop {r3}
; CHECK-T1: pop {[[POP_REG:r[0-3]]]}
; CHECK-T1: add sp, #16
; CHECK-T1: bx r3
; CHECK-T1: bx [[POP_REG]]
; CHECK-LABEL: test_varsize:
; CHECK: sub sp, #16