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659228b9db
Instead of always using addu to adjust the stack pointer when the size out is of the range of an addiu instruction, use subu so that a smaller constant can be generated. This can give savings of ~3 instructions whenever a function has a a stack frame whose size is out of range of an addiu instruction. This change may break some naive stack unwinders. Partially resolves PR/26291. Thanks to David Chisnall for reporting the issue. Reviewers: dsanders, vkalintiris Differential Review: http://reviews.llvm.org/D21321 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@272666 91177308-0d34-0410-b5e6-96231b3b80d8
20 lines
545 B
LLVM
20 lines
545 B
LLVM
; RUN: llc -march=mipsel -relocation-model=pic < %s | FileCheck %s
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define void @f() nounwind {
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entry:
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%a1 = alloca [1073741824 x i8], align 1
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%arrayidx = getelementptr inbounds [1073741824 x i8], [1073741824 x i8]* %a1, i32 0, i32 1048676
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call void @f2(i8* %arrayidx) nounwind
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ret void
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; CHECK-LABEL: f:
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; CHECK: lui $[[R0:[a-z0-9]+]], 16384
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; CHECK: addiu $[[R1:[a-z0-9]+]], $[[R0]], 24
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; CHECK: subu $sp, $sp, $[[R1]]
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; CHECK: lui $[[R2:[a-z0-9]+]], 16384
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; CHECK: addu ${{[0-9]+}}, $sp, $[[R2]]
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}
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declare void @f2(i8*)
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