161 lines
5.8 KiB
LLVM
161 lines
5.8 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s -mtriple=i686-- -O3 -verify-machineinstrs | FileCheck %s
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; Tests for using callbr as an asm-goto wrapper
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; Test 1 - fallthrough label gets removed, but the fallthrough code that is
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; unreachable due to asm ending on a jmp is still left in.
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define i32 @test1(i32 %a) {
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; CHECK-LABEL: test1:
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; CHECK: # %bb.0: # %entry
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; CHECK-NEXT: movl {{[0-9]+}}(%esp), %eax
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; CHECK-NEXT: addl $4, %eax
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; CHECK-NEXT: #APP
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; CHECK-NEXT: xorl %eax, %eax
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; CHECK-NEXT: jmp .Ltmp0
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; CHECK-NEXT: #NO_APP
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; CHECK-NEXT: # %bb.1: # %normal
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; CHECK-NEXT: xorl %eax, %eax
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; CHECK-NEXT: retl
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; CHECK-NEXT: .Ltmp0: # Block address taken
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; CHECK-NEXT: .LBB0_2: # %fail
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; CHECK-NEXT: movl $1, %eax
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; CHECK-NEXT: retl
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entry:
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%0 = add i32 %a, 4
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callbr void asm "xorl $0, $0; jmp ${1:l}", "r,X,~{dirflag},~{fpsr},~{flags}"(i32 %0, i8* blockaddress(@test1, %fail)) to label %normal [label %fail]
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normal:
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ret i32 0
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fail:
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ret i32 1
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}
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; Test 2 - callbr terminates an unreachable block, function gets simplified
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; to a trivial zero return.
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define i32 @test2(i32 %a) {
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; CHECK-LABEL: test2:
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; CHECK: # %bb.0: # %entry
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; CHECK-NEXT: xorl %eax, %eax
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; CHECK-NEXT: retl
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entry:
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br label %normal
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unreachableasm:
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%0 = add i32 %a, 4
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callbr void asm sideeffect "xorl $0, $0; jmp ${1:l}", "r,X,~{dirflag},~{fpsr},~{flags}"(i32 %0, i8* blockaddress(@test2, %fail)) to label %normal [label %fail]
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normal:
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ret i32 0
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fail:
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ret i32 1
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}
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; Test 3 - asm-goto implements a loop. The loop gets recognized, but many loop
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; transforms fail due to canonicalization having callbr exceptions. Trivial
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; blocks at labels 1 and 3 also don't get simplified due to callbr.
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define i32 @test3(i32 %a) {
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; CHECK-LABEL: test3:
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; CHECK: # %bb.0: # %entry
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; CHECK-NEXT: .Ltmp1: # Block address taken
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; CHECK-NEXT: .LBB2_1: # %label01
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; CHECK-NEXT: # =>This Loop Header: Depth=1
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; CHECK-NEXT: # Child Loop BB2_2 Depth 2
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; CHECK-NEXT: # Child Loop BB2_3 Depth 3
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; CHECK-NEXT: # Child Loop BB2_4 Depth 4
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; CHECK-NEXT: .Ltmp2: # Block address taken
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; CHECK-NEXT: .LBB2_2: # %label02
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; CHECK-NEXT: # Parent Loop BB2_1 Depth=1
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; CHECK-NEXT: # => This Loop Header: Depth=2
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; CHECK-NEXT: # Child Loop BB2_3 Depth 3
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; CHECK-NEXT: # Child Loop BB2_4 Depth 4
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; CHECK-NEXT: addl $4, {{[0-9]+}}(%esp)
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; CHECK-NEXT: .Ltmp3: # Block address taken
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; CHECK-NEXT: .LBB2_3: # %label03
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; CHECK-NEXT: # Parent Loop BB2_1 Depth=1
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; CHECK-NEXT: # Parent Loop BB2_2 Depth=2
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; CHECK-NEXT: # => This Loop Header: Depth=3
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; CHECK-NEXT: # Child Loop BB2_4 Depth 4
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; CHECK-NEXT: .Ltmp4: # Block address taken
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; CHECK-NEXT: .LBB2_4: # %label04
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; CHECK-NEXT: # Parent Loop BB2_1 Depth=1
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; CHECK-NEXT: # Parent Loop BB2_2 Depth=2
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; CHECK-NEXT: # Parent Loop BB2_3 Depth=3
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; CHECK-NEXT: # => This Inner Loop Header: Depth=4
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; CHECK-NEXT: #APP
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; CHECK-NEXT: jmp .Ltmp1
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; CHECK-NEXT: jmp .Ltmp2
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; CHECK-NEXT: jmp .Ltmp3
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; CHECK-NEXT: #NO_APP
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; CHECK-NEXT: # %bb.5: # %normal0
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; CHECK-NEXT: # in Loop: Header=BB2_4 Depth=4
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; CHECK-NEXT: #APP
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; CHECK-NEXT: jmp .Ltmp1
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; CHECK-NEXT: jmp .Ltmp2
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; CHECK-NEXT: jmp .Ltmp3
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; CHECK-NEXT: jmp .Ltmp4
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; CHECK-NEXT: #NO_APP
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; CHECK-NEXT: # %bb.6: # %normal1
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; CHECK-NEXT: movl {{[0-9]+}}(%esp), %eax
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; CHECK-NEXT: retl
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entry:
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%a.addr = alloca i32, align 4
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store i32 %a, i32* %a.addr, align 4
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br label %label01
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label01: ; preds = %normal0, %label04, %entry
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br label %label02
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label02: ; preds = %normal0, %label04, %label01
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%0 = load i32, i32* %a.addr, align 4
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%add = add nsw i32 %0, 4
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store i32 %add, i32* %a.addr, align 4
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br label %label03
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label03: ; preds = %normal0, %label04, %label02
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br label %label04
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label04: ; preds = %normal0, %label03
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callbr void asm sideeffect "jmp ${0:l}; jmp ${1:l}; jmp ${2:l}", "X,X,X,~{dirflag},~{fpsr},~{flags}"(i8* blockaddress(@test3, %label01), i8* blockaddress(@test3, %label02), i8* blockaddress(@test3, %label03))
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to label %normal0 [label %label01, label %label02, label %label03]
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normal0: ; preds = %label04
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callbr void asm sideeffect "jmp ${0:l}; jmp ${1:l}; jmp ${2:l}; jmp ${3:l}", "X,X,X,X,~{dirflag},~{fpsr},~{flags}"(i8* blockaddress(@test3, %label01), i8* blockaddress(@test3, %label02), i8* blockaddress(@test3, %label03), i8* blockaddress(@test3, %label04))
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to label %normal1 [label %label01, label %label02, label %label03, label %label04]
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normal1: ; preds = %normal0
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%1 = load i32, i32* %a.addr, align 4
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ret i32 %1
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}
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; Test 4 - asm-goto referenced with the 'l' (ell) modifier and not.
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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: #APP
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; CHECK-NEXT: ja .Ltmp5
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; CHECK-NEXT: #NO_APP
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; CHECK-NEXT: # %bb.1: # %asm.fallthrough
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; CHECK-NEXT: #APP
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; CHECK-NEXT: ja .Ltmp5
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; CHECK-NEXT: #NO_APP
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; CHECK-NEXT: .Ltmp5: # Block address taken
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; CHECK-NEXT: .LBB3_3: # %quux
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; CHECK-NEXT: retl
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entry:
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callbr void asm sideeffect "ja $0", "X,~{dirflag},~{fpsr},~{flags}"(i8* blockaddress(@test4, %quux))
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to label %asm.fallthrough [label %quux]
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asm.fallthrough: ; preds = %entry
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callbr void asm sideeffect "ja ${0:l}", "X,~{dirflag},~{fpsr},~{flags}"(i8* blockaddress(@test4, %quux))
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to label %cleanup [label %quux]
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quux: ; preds = %asm.fallthrough, %entry
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br label %cleanup
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cleanup: ; preds = %asm.fallthrough, %quux
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ret void
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}
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