Question

我构建了LLVM，并在docker中安装了clang，以将C程序编译为LLVM IR，然后从LLVM IR编译为程序集。当我尝试通过llc将.ll文件编译为.s时，出现以下错误：

llc: error: llc: check.ll:12:3: error: instruction expected to be numbered '%5'
  %4 = alloca i32, align 4

我查看了与此相关的其他查询，但是当代码中有ret语句时，它们都遇到了问题，这不是我的情况。会引发此错误的任何特定原因？

这是我的IR代码：

; ModuleID = 'check.c'
source_filename = "check.c"
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-pc-linux-gnu"

@.str = private unnamed_addr constant [3 x i8] c"hi\00", align 1
@.str.1 = private unnamed_addr constant [3 x i8] c"uh\00", align 1

; Function Attrs: noinline nounwind optnone uwtable
define i32 @main(i32, i8**) #0 {
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i8**, align 8
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  store i32 0, i32* %3, align 4
  store i32 %0, i32* %4, align 4
  store i8** %1, i8*** %5, align 8
  store i32 3, i32* %6, align 4
  store i32 2, i32* %7, align 4
  %8 = load i32, i32* %6, align 4
  %9 = load i32, i32* %7, align 4
  %10 = icmp eq i32 %8, %9
  br i1 %10, label %11, label %13

; <label>:11:                                     ; preds = %2
  %12 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str, i32 0, i32 0))
  br label %15

; <label>:13:                                     ; preds = %2
  %14 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i32 0, i32 0))
  br label %15

; <label>:15:                                     ; preds = %13, %11
  %16 = load i32, i32* %3, align 4
  ret i32 %16
}

declare i32 @printf(i8*, ...) #1

attributes #0 = { noinline nounwind optnone uwtable "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #1 = { "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }

!llvm.module.flags = !{!0}
!llvm.ident = !{!1}

!0 = !{i32 1, !"wchar_size", i32 4}
!1 = !{!"clang version 6.0.0-1ubuntu2 (tags/RELEASE_600/final)"}

为什么LLVM llc编译器会为指令号抛出错误？

0 个答案: