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| author | Momchil Velikov <momchil.velikov@arm.com> | 2017-10-22 11:56:35 +0000 |
|---|---|---|
| committer | Momchil Velikov <momchil.velikov@arm.com> | 2017-10-22 11:56:35 +0000 |
| commit | 0be7a36e81d1a49c8640986402b28d842c1f54fa (patch) | |
| tree | 4d2659e4f162b017d20618bf88e7b14d24ae9d7d /test/CodeGen/ARM/thumb1_return_sequence.ll | |
| parent | 5631544a096b0a3b48213f757e0cd47d10afa2fd (diff) | |
[ARM] Dynamic stack alignment for 16-bit Thumb
This patch implements dynamic stack (re-)alignment for 16-bit Thumb. When
targeting processors, which support only the 16-bit Thumb instruction set
the compiler ignores the alignment attributes of automatic variables and may
silently generate incorrect code.
Differential revision: https://reviews.llvm.org/D38143
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@316289 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen/ARM/thumb1_return_sequence.ll')
| -rw-r--r-- | test/CodeGen/ARM/thumb1_return_sequence.ll | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/test/CodeGen/ARM/thumb1_return_sequence.ll b/test/CodeGen/ARM/thumb1_return_sequence.ll index 67d1cad2cf6..c54712efb39 100644 --- a/test/CodeGen/ARM/thumb1_return_sequence.ll +++ b/test/CodeGen/ARM/thumb1_return_sequence.ll @@ -9,6 +9,8 @@ entry: ; -------- ; CHECK-V4T: push {[[SAVED:(r[4567](, )?)+]], lr} ; CHECK-V4T: sub sp, +; Stack is realigned because of the <6 x i32> type +; CHECK-V4T: mov sp, r4 ; CHECK-V5T: push {[[SAVED:(r[4567](, )?)+]], lr} %b = alloca <6 x i32>, align 16 @@ -21,7 +23,8 @@ entry: ; Epilogue ; -------- -; CHECK-V4T: add sp, +; Stack realignment means sp is restored from frame pointer +; CHECK-V4T: mov sp ; CHECK-V4T-NEXT: pop {[[SAVED]]} ; The ISA for v4 does not support pop pc, so make sure we do not emit ; one even when we do not need to update SP. @@ -70,8 +73,9 @@ entry: ; CHECK-V4T-NEXT: mov lr, [[POP_REG]] ; CHECK-V4T-NEXT: mov [[POP_REG]], r12 ; CHECK-V4T: bx lr -; CHECK-V5T: add sp, -; CHECK-V5T-NEXT: pop {[[SAVED]]} +; CHECK-V5T: lsls r4 +; CHECK-V5T-NEXT: mov sp, r4 +; CHECK-V5T: pop {[[SAVED]]} ; CHECK-V5T-NEXT: mov r12, [[POP_REG:r[0-7]]] ; CHECK-V5T-NEXT: pop {[[POP_REG]]} ; CHECK-V5T-NEXT: add sp, |