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We have positives in GVN because of missing support for tail calls. see, e.g.: llvm/llvm-project#61670 https://alive2.llvm.org/ce/z/GssD2L
define i64 @src(i64 noundef %arg) { %call2 = alloca i64 %call3 = alloca i64 store i64 %arg, ptr %call2, align 8 tail call void @llvm.memcpy.p0.p0.i64(ptr %call3, ptr %call2, i64 8, i1 false) %load1 = load i64, ptr %call3, align 8 ret i64 %load1 } declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) $ opt -p gvn define i64 @src(i64 %arg) { %call2 = alloca i64, align 8 %call3 = alloca i64, align 8 store i64 %arg, ptr %call2, align 8 tail call void @llvm.memcpy.p0.p0.i64(ptr %call3, ptr %call2, i64 8, i1 false) ret i64 undef }
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We have positives in GVN because of missing support for tail calls.
see, e.g.: llvm/llvm-project#61670
https://alive2.llvm.org/ce/z/GssD2L
The text was updated successfully, but these errors were encountered: