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25464b948f
Large frame offsets are loaded from the ConstantPool. Where possible, offsets are encoded using the smaller MKMSK instruction. Large frame offsets can only be used when there is a frame-pointer. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@196085 91177308-0d34-0410-b5e6-96231b3b80d8
43 lines
1.2 KiB
LLVM
43 lines
1.2 KiB
LLVM
; Functions with frames > 256K bytes require a frame pointer to access the stack.
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; At present, functions must be compiled using '-fno-omit-frame-pointer'.
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; RUN: llc < %s -march=xcore -disable-fp-elim | FileCheck %s
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declare void @f0(i32*)
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; CHECK: .section .cp.rodata.cst4,"aMc",@progbits,4
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; CHECK: .LCPI[[NUM:[0-9_]+]]:
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; CHECK: .long 99999
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; CHECK: .text
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; CHECK-LABEL:f1
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; CHECK: entsp 65535
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; CHECK-NEXT: extsp 34465
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; CHECK-NEXT: stw r10, sp[1]
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; CHECK-NEXT: ldaw r10, sp[0]
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; CHECK-NEXT: ldw r1, cp[.LCPI[[NUM]]]
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; CHECK-NEXT: ldaw r0, r10[r1]
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; CHECK-NEXT: extsp 1
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; CHECK-NEXT: bl f0
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; CHECK-NEXT: ldaw sp, sp[1]
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; CHECK-NEXT: set sp, r10
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; CHECK-NEXT: ldw r10, sp[1]
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; CHECK-NEXT: ldaw sp, sp[65535]
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; CHECK-NEXT: retsp 34465
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define void @f1() nounwind {
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entry:
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%0 = alloca [99998 x i32]
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%1 = getelementptr inbounds [99998 x i32]* %0, i32 0, i32 99997
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call void @f0(i32* %1)
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ret void
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}
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; CHECK-LABEL:f2
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; CHECK: mkmsk [[REG:r[0-9]+]], 15
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; CHECK-NEXT: ldaw r0, r10{{\[}}[[REG]]{{\]}}
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define void @f2() nounwind {
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entry:
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%0 = alloca [32768 x i32]
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%1 = getelementptr inbounds [32768 x i32]* %0, i32 0, i32 32765
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call void @f0(i32* %1)
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ret void
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}
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