| Issue |
185558
|
| Summary |
Missed Optimization: Failure to vectorize scalar loads and comparisons into a single vector operation
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
dreamking60
|
```
define i1 @src(ptr %arg0, ptr %arg1) {
%v0 = load <2 x float>, ptr %arg1, align 8
%v1 = load float, ptr %arg0, align 4
%v2 = extractelement <2 x float> %v0, i64 0
%v3 = fcmp une float %v1, %v2
%v4 = getelementptr inbounds nuw i8, ptr %arg0, i64 4
%v5 = load float, ptr %v4, align 4
%v6 = extractelement <2 x float> %v0, i64 1
%v7 = fcmp une float %v5, %v6
%v8 = select i1 %v3, i1 true, i1 %v7
ret i1 %v8
}
define i1 @tgt(ptr %arg0, ptr %arg1) {
%vec_arg0 = load <2 x float>, ptr %arg0, align 4
%vec_arg1 = load <2 x float>, ptr %arg1, align 8
%cmp_result_vec = fcmp une <2 x float> %vec_arg0, %vec_arg1
%res0 = extractelement <2 x i1> %cmp_result_vec, i64 0
%res1 = extractelement <2 x i1> %cmp_result_vec, i64 1
%final_res = select i1 %res0, i1 true, i1 %res1
ret i1 %final_res
}
```
godbolt: https://godbolt.org/z/TE1czre66
alive2: https://alive2.llvm.org/ce/z/eqjwqJ
Pattern found in: https://github.com/dtcxzyw/llvm-opt-benchmark/blob/main/bench/pbrt-v4/optimized/imgtool.ll
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