1; RUN: llc -O1 -regalloc=greedy -mtriple=x86_64-apple-macosx -march x86-64 < %s -o - | FileCheck %s 2; Check that last chance split (RAGreedy::tryInstructonSplit) just split 3; when this is beneficial, otherwise we end up with uncoalesced copies. 4; <rdar://problem/15570057> 5 6target datalayout = "e-i64:64-f80:128-s:64-n8:16:32:64-S128" 7 8@f = external constant void (i32)* 9 10; CHECK-LABEL: test: 11; Get the address of f in the GOT. 12; CHECK: movq _f@{{[^,]+}}, [[F_ENTRY_ADDR:%[a-z0-9]+]] 13; Read the actual address of f. 14; CHECK: movq ([[F_ENTRY_ADDR]]), [[F_ADDR:%[a-z0-9]+]] 15; Check that we do not have useless split points before each call. 16; CHECK-NOT: movq 17; CHECK: callq *[[F_ADDR]] 18; Check that we do not have useless split points before each call. 19; CHECK-NOT: movq 20; CHECK: callq *[[F_ADDR]] 21; Last call is a tail call, thus the address of the function cannot use 22; a callee saved register. 23; CHECK: movq [[F_ADDR]], [[F_ADDR_TC:%[a-z0-9]+]] 24; CHECK: popq [[F_ADDR]] 25; CHECK: jmpq *[[F_ADDR_TC]] 26define void @test(i32 %a, i32 %b, i32 %c) { 27entry: 28 %fct_f = load void (i32)** @f, align 8 29 tail call void %fct_f(i32 %a) 30 tail call void %fct_f(i32 %b) 31 tail call void %fct_f(i32 %c) 32 ret void 33} 34