[llvm-dev] How to insert vector type input parameter for function in C/C++ API?

[Michael Choi via llvm-dev]

I am working on AVX2 code generation by LLVM framework.

I want to generate LLVM-IR code for the following code by C/C++ API from
LLVM framework. I am using LLVM3.8.
Basically, I want to generate TARGET (Refer to below) LLVM-IR code for
SOURCE function by C/C++ API.
As you see below, the AVX2 data type is __m256i which is vector type. How
can I indicate vector type (function return type, input parameters) for
IRBuiler by C/C++ APIs?

I don't see any example online and please let me know if anybody has
examples.



SOURCE:
#include "immintrin.h"
__m256i sum(__m256i a, __m256i b) {
    return a+b;
}

TARGET:
michael at michael-Precision-Tower-3420:~/Year_2017/work_DEMO$ cat avx2_add2.ll
; ModuleID = 'avx2_add2.c'
target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-windows-cygnus"

; Function Attrs: nounwind
define <4 x i64> @sum(<4 x i64> %a, <4 x i64> %b) #0 {
  %1 = alloca <4 x i64>, align 32
  %2 = alloca <4 x i64>, align 32
  store <4 x i64> %a, <4 x i64>* %1, align 32
  store <4 x i64> %b, <4 x i64>* %2, align 32
  %3 = load <4 x i64>, <4 x i64>* %1, align 32
  %4 = load <4 x i64>, <4 x i64>* %2, align 32
  %5 = add <4 x i64> %3, %4
  ret <4 x i64> %5
}

attributes #0 = { nounwind "disable-tail-calls"="false"
"less-precise-fpmad"="false" "no-frame-pointer-elim"="false"
"no-infs-fp-math"="false" "no-nans-fp-math"="false"
"stack-protector-buffer-size"="8" "target-features"="+mmx,+sse,+sse2"
"unsafe-fp-math"="false" "use-soft-float"="false" }

!llvm.ident = !{!0}

!0 = !{!"clang version 3.8.1 (tags/RELEASE_381/final)"}

Thanks,
Michael
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