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e204350911
Tailcalls are only OK with forwarded sret pointers. With sret demotion, they're not, as we'd have a pointer into a soon-to-be-dead stack frame. Differential Revison: http://reviews.llvm.org/D8510 llvm-svn: 233409
47 lines
1.4 KiB
LLVM
47 lines
1.4 KiB
LLVM
; RUN: llc < %s -mtriple arm64-apple-darwin -aarch64-load-store-opt=false -asm-verbose=false | FileCheck %s
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; Disable the load/store optimizer to avoid having LDP/STPs and simplify checks.
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target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
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; Check that we don't try to tail-call with an sret-demoted return.
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declare i1024 @test_sret() #0
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; CHECK-LABEL: _test_call_sret:
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; CHECK: mov x[[CALLERX8NUM:[0-9]+]], x8
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; CHECK: mov x8, sp
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; CHECK-NEXT: bl _test_sret
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; CHECK-NEXT: ldr [[CALLERSRET1:x[0-9]+]], [sp]
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; CHECK: str [[CALLERSRET1:x[0-9]+]], [x[[CALLERX8NUM]]]
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; CHECK: ret
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define i1024 @test_call_sret() #0 {
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%a = call i1024 @test_sret()
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ret i1024 %a
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}
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; CHECK-LABEL: _test_tailcall_sret:
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; CHECK: mov x[[CALLERX8NUM:[0-9]+]], x8
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; CHECK: mov x8, sp
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; CHECK-NEXT: bl _test_sret
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; CHECK-NEXT: ldr [[CALLERSRET1:x[0-9]+]], [sp]
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; CHECK: str [[CALLERSRET1:x[0-9]+]], [x[[CALLERX8NUM]]]
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; CHECK: ret
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define i1024 @test_tailcall_sret() #0 {
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%a = tail call i1024 @test_sret()
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ret i1024 %a
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}
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; CHECK-LABEL: _test_indirect_tailcall_sret:
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; CHECK: mov x[[CALLERX8NUM:[0-9]+]], x8
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; CHECK: mov x8, sp
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; CHECK-NEXT: blr x0
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; CHECK-NEXT: ldr [[CALLERSRET1:x[0-9]+]], [sp]
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; CHECK: str [[CALLERSRET1:x[0-9]+]], [x[[CALLERX8NUM]]]
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; CHECK: ret
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define i1024 @test_indirect_tailcall_sret(i1024 ()* %f) #0 {
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%a = tail call i1024 %f()
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ret i1024 %a
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}
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attributes #0 = { nounwind }
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