derek.holloway
7502bf64a4
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34 lines
1.1 KiB
LLVM
34 lines
1.1 KiB
LLVM
; RUN: llc -O1 -regalloc=greedy -mtriple=x86_64-apple-macosx < %s -o - | FileCheck %s
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; Check that last chance split (RAGreedy::tryInstructonSplit) just split
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; when this is beneficial, otherwise we end up with uncoalesced copies.
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; <rdar://problem/15570057>
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target datalayout = "e-i64:64-f80:128-s:64-n8:16:32:64-S128"
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@f = external constant ptr
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; CHECK-LABEL: test:
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; Get the address of f in the GOT.
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; CHECK: movq _f@{{[^,]+}}, [[F_ENTRY_ADDR:%[a-z0-9]+]]
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; Read the actual address of f.
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; CHECK: movq ([[F_ENTRY_ADDR]]), [[F_ADDR:%[a-z0-9]+]]
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; Check that we do not have useless split points before each call.
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; CHECK-NOT: movq
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; CHECK: callq *[[F_ADDR]]
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; Check that we do not have useless split points before each call.
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; CHECK-NOT: movq
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; CHECK: callq *[[F_ADDR]]
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; Last call is a tail call, thus the address of the function cannot use
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; a callee saved register.
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; CHECK: movq [[F_ADDR]], [[F_ADDR_TC:%[a-z0-9]+]]
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; CHECK: popq [[F_ADDR]]
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; CHECK: jmpq *[[F_ADDR_TC]]
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define void @test(i32 %a, i32 %b, i32 %c) {
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entry:
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%fct_f = load ptr, ptr @f, align 8
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tail call void %fct_f(i32 %a)
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tail call void %fct_f(i32 %b)
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tail call void %fct_f(i32 %c)
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ret void
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}
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