Enzyme Bug - Phi Nodes #2492
Description
I had a bug when compiling an enzyme project. I followed the instructions and created a minimal reproducer. Here is the link below:
Error Message: PHI nodes not grouped at top of basic block!
Here is the minimal reproducer as well:
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
define i32 @foo(ptr %0) {
%2 = call i32 @baz(ptr %0, ptr null)
ret i32 %2
}
define i32 @baz(ptr %0, ptr %1) {
%3 = load i32, ptr %0, align 4
%4 = tail call i32 @llvm.abs.i32(i32 %3, i1 false)
%5 = or i32 0, %4
%6 = sitofp i32 %5 to double
store double %6, ptr %1, align 8
ret i32 0
}
define {} @_ZN8overhead4main17h25736e915a18b782E() {
%1 = tail call {} (...) @__enzyme_fwddiff_foo(ptr @bar)
ret {} %1
}
define i32 @bar() {
%1 = alloca [120 x i8], align 8
%2 = call i32 @foo(ptr %1)
ret i32 %2
}
declare {} @__enzyme_fwddiff_foo(...)
; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i32 @llvm.abs.i32(i32, i1 immarg) #0
attributes #0 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }