[llvm-dev] alloca (original) (raw)

Bruce Hoult via llvm-dev llvm-dev at lists.llvm.org
Tue Sep 5 05:28:26 PDT 2017

Sure. Loads and stores.

int foo(int i){ return i; }

$ clang alloca.c -S -emit-llvm $ cat alloca.ll ; ModuleID = 'alloca.c' target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" target triple = "x86_64-pc-linux-gnu"

; Function Attrs: nounwind uwtable define i32 @foo(i32 %i) #0 { %1 = alloca i32, align 4 store i32 %i, i32* %1, align 4 %2 = load i32, i32* %1, align 4 ret i32 %2 }

attributes #0 = { nounwind uwtable "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" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2" "unsafe-fp-math"="false" "use-soft-float"="false" }

!llvm.ident = !{!0}

!0 = !{!"clang version 3.8.0-2ubuntu4 (tags/RELEASE_380/final)"}

On Tue, Sep 5, 2017 at 3:17 PM, Anastasiya Ruzhanskaya via llvm-dev < llvm-dev at lists.llvm.org> wrote:

Hello, is the alloca instruction itself valid input for stores instructions ( and maybe some others?). In all realistic examples I encountered it as input only to getelementptr instruction.

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