[llvm-bugs] [Bug 30188] SimplifyCFG blocks SROA optimization

via llvm-bugs llvm-bugs at lists.llvm.org
Sun Jul 30 09:01:26 PDT 2017


Ariel Ben-Yehuda <arielb1 at mail.tau.ac.il> changed:

           What    |Removed                     |Added
         Resolution|FIXED                       |---
             Status|RESOLVED                    |REOPENED
                 CC|                            |arielb1 at mail.tau.ac.il

--- Comment #25 from Ariel Ben-Yehuda <arielb1 at mail.tau.ac.il> ---
Still a problem with GEPs of allocas:

%SearchWhile = type { i8, i8 }

define i8 @sink(i1) {
    %t = alloca %SearchWhile
    %t_0 = getelementptr inbounds %SearchWhile, %SearchWhile* %t, i32 0, i32 0
    %t_1 = getelementptr inbounds %SearchWhile, %SearchWhile* %t, i32 0, i32 1
    br i1 %0, label %if_false, label %if_true
    store i8 0, i8* %t_0
    br label %exit
    store i8 1, i8* %t_0
    store i8 0, i8* %t_1
    br label %exit
    %val = load i8, i8* %t_0, align 1
    ret i8 %val

This is the cause of Rust's https://github.com/rust-lang/rust/issues/43517

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