cdab6ffd6d
In function spillFPBP we already try to skip terminator, but there is a logic error, so when there is only terminator instruction in the MBB, it still tries to save/restore fp/bp around it if the terminator clobbers fp/bp, for example a tail call with ghc calling convention. Now this patch really skips terminator even if it is the only instruction in the MBB.
190 lines
5.8 KiB
LLVM
190 lines
5.8 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 4
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; RUN: llc -mtriple=x86_64-pc-linux -stackrealign -verify-machineinstrs < %s | FileCheck %s
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; Calling convention ghccc uses ebp to pass parameter, so calling a function
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; using ghccc clobbers ebp. We should save and restore ebp around such a call
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; if ebp is used as frame pointer.
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declare ghccc i32 @external(i32)
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; Basic test with ghccc calling convention.
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define i32 @test1(i32 %0, i32 %1) {
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; CHECK-LABEL: test1:
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; CHECK: # %bb.0:
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; CHECK-NEXT: pushq %rbp
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; CHECK-NEXT: .cfi_def_cfa_offset 16
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; CHECK-NEXT: .cfi_offset %rbp, -16
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; CHECK-NEXT: movq %rsp, %rbp
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; CHECK-NEXT: .cfi_def_cfa_register %rbp
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; CHECK-NEXT: pushq %r15
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; CHECK-NEXT: pushq %r14
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; CHECK-NEXT: pushq %r13
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; CHECK-NEXT: pushq %r12
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; CHECK-NEXT: pushq %rbx
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; CHECK-NEXT: andq $-16, %rsp
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; CHECK-NEXT: subq $16, %rsp
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; CHECK-NEXT: .cfi_offset %rbx, -56
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; CHECK-NEXT: .cfi_offset %r12, -48
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; CHECK-NEXT: .cfi_offset %r13, -40
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; CHECK-NEXT: .cfi_offset %r14, -32
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; CHECK-NEXT: .cfi_offset %r15, -24
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; CHECK-NEXT: # kill: def $edi killed $edi def $rdi
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; CHECK-NEXT: pushq %rbp
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; CHECK-NEXT: pushq %rax
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; CHECK-NEXT: .cfi_remember_state
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; CHECK-NEXT: .cfi_escape 0x0f, 0x06, 0x77, 0x08, 0x06, 0x11, 0x10, 0x22 #
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; CHECK-NEXT: movl %esi, %ebp
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; CHECK-NEXT: movq %rdi, %r13
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; CHECK-NEXT: callq external@PLT
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; CHECK-NEXT: addq $8, %rsp
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; CHECK-NEXT: popq %rbp
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; CHECK-NEXT: .cfi_restore_state
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; CHECK-NEXT: leaq -40(%rbp), %rsp
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; CHECK-NEXT: popq %rbx
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; CHECK-NEXT: popq %r12
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; CHECK-NEXT: popq %r13
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; CHECK-NEXT: popq %r14
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; CHECK-NEXT: popq %r15
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; CHECK-NEXT: popq %rbp
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; CHECK-NEXT: .cfi_def_cfa %rsp, 8
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; CHECK-NEXT: retq
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%x = call ghccc i32 @external(i32 %0, i32 %1)
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ret i32 %x
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}
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; Calling convention hipe has similar behavior. It clobbers rbp but not rbx.
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declare cc 11 i64 @hipe1(i64)
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declare cc 11 i64 @hipe2(i64, i64, i64, i64, i64, i64, i64)
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; Basic test with hipe calling convention.
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define i64 @test2(i64 %a0, i64 %a1) {
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; CHECK-LABEL: test2:
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; CHECK: # %bb.0:
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; CHECK-NEXT: pushq %rbp
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; CHECK-NEXT: .cfi_def_cfa_offset 16
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; CHECK-NEXT: .cfi_offset %rbp, -16
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; CHECK-NEXT: movq %rsp, %rbp
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; CHECK-NEXT: .cfi_def_cfa_register %rbp
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; CHECK-NEXT: pushq %r15
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; CHECK-NEXT: pushq %r14
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; CHECK-NEXT: pushq %r13
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; CHECK-NEXT: pushq %r12
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; CHECK-NEXT: pushq %rbx
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; CHECK-NEXT: andq $-16, %rsp
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; CHECK-NEXT: subq $16, %rsp
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; CHECK-NEXT: .cfi_offset %rbx, -56
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; CHECK-NEXT: .cfi_offset %r12, -48
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; CHECK-NEXT: .cfi_offset %r13, -40
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; CHECK-NEXT: .cfi_offset %r14, -32
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; CHECK-NEXT: .cfi_offset %r15, -24
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; CHECK-NEXT: pushq %rbp
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; CHECK-NEXT: pushq %rax
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; CHECK-NEXT: .cfi_remember_state
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; CHECK-NEXT: .cfi_escape 0x0f, 0x06, 0x77, 0x08, 0x06, 0x11, 0x10, 0x22 #
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; CHECK-NEXT: movq %rsi, %rbp
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; CHECK-NEXT: movq %rdi, %r15
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; CHECK-NEXT: callq hipe1@PLT
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; CHECK-NEXT: addq $8, %rsp
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; CHECK-NEXT: popq %rbp
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; CHECK-NEXT: .cfi_restore_state
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; CHECK-NEXT: movq %r15, %rax
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; CHECK-NEXT: leaq -40(%rbp), %rsp
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; CHECK-NEXT: popq %rbx
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; CHECK-NEXT: popq %r12
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; CHECK-NEXT: popq %r13
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; CHECK-NEXT: popq %r14
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; CHECK-NEXT: popq %r15
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; CHECK-NEXT: popq %rbp
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; CHECK-NEXT: .cfi_def_cfa %rsp, 8
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; CHECK-NEXT: retq
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%x = call cc 11 i64 @hipe1(i64 %a0, i64 %a1)
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ret i64 %x
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}
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@buf = dso_local global [20 x ptr] zeroinitializer, align 16
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; longjmp modifies fp, it is expected behavior, wo should not save/restore fp
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; around it.
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define void @test4() {
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; CHECK-LABEL: test4:
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; CHECK: # %bb.0: # %entry
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; CHECK-NEXT: pushq %rbp
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; CHECK-NEXT: .cfi_def_cfa_offset 16
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; CHECK-NEXT: .cfi_offset %rbp, -16
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; CHECK-NEXT: movq %rsp, %rbp
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; CHECK-NEXT: .cfi_def_cfa_register %rbp
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; CHECK-NEXT: pushq %r15
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; CHECK-NEXT: pushq %r14
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; CHECK-NEXT: pushq %r13
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; CHECK-NEXT: pushq %r12
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; CHECK-NEXT: pushq %rbx
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; CHECK-NEXT: andq $-16, %rsp
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; CHECK-NEXT: subq $16, %rsp
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; CHECK-NEXT: .cfi_offset %rbx, -56
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; CHECK-NEXT: .cfi_offset %r12, -48
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; CHECK-NEXT: .cfi_offset %r13, -40
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; CHECK-NEXT: .cfi_offset %r14, -32
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; CHECK-NEXT: .cfi_offset %r15, -24
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; CHECK-NEXT: xorl %r13d, %r13d
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; CHECK-NEXT: pushq %rbp
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; CHECK-NEXT: pushq %rax
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; CHECK-NEXT: .cfi_remember_state
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; CHECK-NEXT: .cfi_escape 0x0f, 0x06, 0x77, 0x08, 0x06, 0x11, 0x10, 0x22 #
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; CHECK-NEXT: callq external@PLT
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; CHECK-NEXT: addq $8, %rsp
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; CHECK-NEXT: popq %rbp
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; CHECK-NEXT: .cfi_restore_state
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; CHECK-NEXT: movq buf(%rip), %rbp
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; CHECK-NEXT: movq buf+8(%rip), %rax
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; CHECK-NEXT: movq buf+16(%rip), %rsp
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; CHECK-NEXT: jmpq *%rax
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entry:
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%x = call ghccc i32 @external(i32 0)
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call void @llvm.eh.sjlj.longjmp(ptr @buf)
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unreachable
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}
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declare ghccc void @tail()
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; We should not save/restore fp/bp around terminator.
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define ghccc void @test5() {
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; CHECK-LABEL: test5:
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; CHECK: # %bb.0: # %entry
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; CHECK-NEXT: pushq %rbp
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; CHECK-NEXT: .cfi_def_cfa_offset 16
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; CHECK-NEXT: .cfi_offset %rbp, -16
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; CHECK-NEXT: movq %rsp, %rbp
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; CHECK-NEXT: .cfi_def_cfa_register %rbp
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; CHECK-NEXT: andq $-8, %rsp
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; CHECK-NEXT: xorl %eax, %eax
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; CHECK-NEXT: testb %al, %al
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; CHECK-NEXT: jne .LBB3_2
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; CHECK-NEXT: # %bb.1: # %then
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; CHECK-NEXT: movq $0, (%rax)
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; CHECK-NEXT: movq %rbp, %rsp
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; CHECK-NEXT: popq %rbp
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; CHECK-NEXT: .cfi_def_cfa %rsp, 8
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; CHECK-NEXT: retq
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; CHECK-NEXT: .LBB3_2: # %else
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; CHECK-NEXT: .cfi_def_cfa %rbp, 16
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; CHECK-NEXT: movq %rbp, %rsp
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; CHECK-NEXT: popq %rbp
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; CHECK-NEXT: .cfi_def_cfa %rsp, 8
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; CHECK-NEXT: jmp tail@PLT # TAILCALL
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entry:
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br i1 undef, label %then, label %else
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then:
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store i64 0, ptr undef
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br label %exit
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else:
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musttail call ghccc void @tail()
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ret void
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exit:
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ret void
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}
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