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authorTim Northover <tnorthover@apple.com>2013-12-09 09:05:30 +0000
committerTim Northover <tnorthover@apple.com>2013-12-09 09:05:30 +0000
commit54ed08e250a76b570c2162d49633e11b8ebb2d98 (patch)
tree7391ecf1a422133317d0242a99306f576ad03870 /test/CodeGen
parent7d9c02dc620ea5f5cdf2dc0bd0f03d9370f845d3 (diff)
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Merge r196725 (conflicts on same API as before):
------------------------------------------------------------------------ r196725 | tnorthover | 2013-12-08 15:56:50 +0000 (Sun, 08 Dec 2013) | 19 lines ARM: fix folding of stack-adjustment (yet again). When trying to eliminate an "sub sp, sp, #N" instruction by folding it into an existing push/pop using dummy registers, we need to account for the fact that this might affect precisely how "fp" gets set in the prologue. We were attempting this, but assuming that *whenever* we performed a fold it would make a difference. This is false, for example, in: push {r4, r7, lr} add fp, sp, #4 vpush {d8} sub sp, sp, #8 we can fold the "sub" into the "vpush", forming "vpush {d7, d8}". However, in that case the "add fp" instruction mustn't change, which we were getting wrong before. Should fix PR18160. ------------------------------------------------------------------------ git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_34@196769 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen')
-rw-r--r--test/CodeGen/ARM/fold-stack-adjust.ll9
1 files changed, 9 insertions, 0 deletions
diff --git a/test/CodeGen/ARM/fold-stack-adjust.ll b/test/CodeGen/ARM/fold-stack-adjust.ll
index 8c60bca..67fd129 100644
--- a/test/CodeGen/ARM/fold-stack-adjust.ll
+++ b/test/CodeGen/ARM/fold-stack-adjust.ll
@@ -137,6 +137,15 @@ define void @test_fold_point(i1 %tst) minsize {
; CHECK: {{LBB[0-9]+_2}}:
; CHECK-NEXT: vpop {d7, d8}
; CHECK-NEXT: pop {r4, pc}
+
+ ; With a guaranteed frame-pointer, we want to make sure that its offset in the
+ ; push block is correct, even if a few registers have been tacked onto a later
+ ; vpush (PR18160).
+; CHECK-IOS-LABEL: test_fold_point:
+; CHECK-IOS: push {r4, r7, lr}
+; CHECK-IOS-NEXT: add r7, sp, #4
+; CHECK-IOS-NEXT: vpush {d7, d8}
+
; We want some memory so there's a stack adjustment to fold...
%var = alloca i8, i32 8