derek.holloway
7502bf64a4
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43 lines
1.3 KiB
LLVM
43 lines
1.3 KiB
LLVM
; RUN: llc -verify-machineinstrs -mtriple=i686-linux < %s | FileCheck --implicit-check-not="jmp.*\*" --implicit-check-not="call.*\*" %s
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; Test 32-bit retpoline when -mregparm=3 is used. This case is interesting
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; because there are no available scratch registers. The Linux kernel builds
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; with -mregparm=3, so we need to support it. TCO should fail because we need
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; to restore EDI.
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define void @call_edi(ptr %fp) #0 {
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entry:
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tail call void %fp(i32 inreg 0, i32 inreg 0, i32 inreg 0)
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ret void
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}
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; CHECK-LABEL: call_edi:
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; EDI is used, so it must be saved.
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; CHECK: pushl %edi
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; CHECK-DAG: xorl %eax, %eax
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; CHECK-DAG: xorl %edx, %edx
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; CHECK-DAG: xorl %ecx, %ecx
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; CHECK-DAG: movl {{.*}}, %edi
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; CHECK: calll __llvm_retpoline_edi
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; CHECK: popl %edi
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; CHECK: retl
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define void @edi_external(ptr %fp) #1 {
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entry:
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tail call void %fp(i32 inreg 0, i32 inreg 0, i32 inreg 0)
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ret void
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}
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; CHECK-LABEL: edi_external:
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; CHECK: pushl %edi
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; CHECK-DAG: xorl %eax, %eax
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; CHECK-DAG: xorl %edx, %edx
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; CHECK-DAG: xorl %ecx, %ecx
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; CHECK-DAG: movl {{.*}}, %edi
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; CHECK: calll __x86_indirect_thunk_edi
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; CHECK: popl %edi
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; CHECK: retl
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attributes #0 = { "target-features"="+retpoline-indirect-calls" }
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attributes #1 = { "target-features"="+retpoline-indirect-calls,+retpoline-external-thunk" }
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