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4e4ba838d9
Re-apply r276044/r279124/r305516. Fixed a problem where we would refuse to place spills as the very first instruciton of a basic block and thus artifically increase pressure (test in test/CodeGen/PowerPC/scavenging.mir:spill_at_begin) This is a variant of scavengeRegister() that works for enterBasicBlockEnd()/backward(). The benefit of the backward mode is that it is not affected by incomplete kill flags. This patch also changes PrologEpilogInserter::doScavengeFrameVirtualRegs() to use the register scavenger in backwards mode. Differential Revision: http://reviews.llvm.org/D21885 llvm-svn: 305625
25 lines
645 B
LLVM
25 lines
645 B
LLVM
; RUN: llc -o - %s | FileCheck %s
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target triple="arm--"
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@glob = external global i32*
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declare void @bar(i32*, [20000 x i8]* byval)
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; CHECK-LABEL: foo:
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; We should see the stack getting additional alignment
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; CHECK: sub sp, sp, #16
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; CHECK: bic sp, sp, #31
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; And a base pointer getting used.
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; CHECK: mov r6, sp
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; Which is passed to the call
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; CHECK: add [[REG:r[0-9]+|lr]], r6, #19456
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; CHECK: add r0, [[REG]], #536
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; CHECK: bl bar
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define void @foo([20000 x i8]* %addr) {
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%tmp = alloca [4 x i32], align 32
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%tmp0 = getelementptr [4 x i32], [4 x i32]* %tmp, i32 0, i32 0
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call void @bar(i32* %tmp0, [20000 x i8]* byval %addr)
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ret void
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}
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