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llvm-project/llvm/test/CodeGen/ARM/alloca-align.ll

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ARM: Compute MaxCallFrame size early This exposes a method in MachineFrameInfo that calculates MaxCallFrameSize and calls it after instruction selection in the ARM target. This avoids ARMBaseRegisterInfo::canRealignStack()/ARMFrameLowering::hasReservedCallFrame() giving different answers in early/late phases of codegen. The testcase shows a particular nasty example result of that where we would fail to properly align an alloca. Differential Revision: https://reviews.llvm.org/D32622 llvm-svn: 302303
2017-05-06 06:04:05 +08:00
; RUN: llc -o - %s | FileCheck %s
target triple="arm--"
@glob = external global i32*
declare void @bar(i32*, [20000 x i8]* byval)
; CHECK-LABEL: foo:
; We should see the stack getting additional alignment
; CHECK: sub sp, sp, #16
; CHECK: bic sp, sp, #31
; And a base pointer getting used.
; CHECK: mov r6, sp
; Which is passed to the call
ARM: use correct offset from base pointer (r6) in call frame regions. When we had dynamic call frames (i.e. sp adjustment around each call) we were including that adjustment into offsets calculated based on r6, even though it's only sp that changes. This led to incorrect stack slot accesses. llvm-svn: 348591
2018-12-07 21:43:55 +08:00
; CHECK: mov r0, r6
ARM: Compute MaxCallFrame size early This exposes a method in MachineFrameInfo that calculates MaxCallFrameSize and calls it after instruction selection in the ARM target. This avoids ARMBaseRegisterInfo::canRealignStack()/ARMFrameLowering::hasReservedCallFrame() giving different answers in early/late phases of codegen. The testcase shows a particular nasty example result of that where we would fail to properly align an alloca. Differential Revision: https://reviews.llvm.org/D32622 llvm-svn: 302303
2017-05-06 06:04:05 +08:00
; CHECK: bl bar
define void @foo([20000 x i8]* %addr) {
%tmp = alloca [4 x i32], align 32
%tmp0 = getelementptr [4 x i32], [4 x i32]* %tmp, i32 0, i32 0
call void @bar(i32* %tmp0, [20000 x i8]* byval %addr)
ret void
}