| Issue |
180614
|
| Summary |
[hexagon] Assertion failure `I != Instrs.begin() - 1 && "Couldn't find producer"`
|
| Labels |
backend:Hexagon
|
| Assignees |
androm3da
|
| Reporter |
androm3da
|
This reproduces an assertion in llc when compiling for Hexagon with `--disable-packetizer`. This was discovered while bootstrapping a native toolchain for hexagon. The LLVM sources triggered another issue which we tried to workaround with `--disable-packetizer` but then that failed also.
```
llc -mtriple=hexagon-unknown-linux-musl -mcpu=hexagonv68 -O1 --disable-packetizer --filetype=obj -o /dev/null reduced.ll
```
reduced.ll:
```
; ModuleID = '/home/brian/src/toolchain_for_hexagon/dis_packetizer_bug/reduced.bc'
target datalayout = "e-m:e-p:32:32:32-a:0-n16:32-i64:64:64-i32:32:32-i16:16:16-i1:8:8-f32:32:32-f64:64:64-v32:32:32-v64:64:64-v512:512:512-v1024:1024:1024-v2048:2048:2048"
target triple = "hexagon-unknown-linux-musl"
define i32 @_ZN4llvm2cl16ExpansionContextC2ERNS_20BumpPtrAllocatorImplINS_15MallocAllocatorELj4096ELj4096ELj128EEEPFvNS_9StringRefERNS_11StringSaverERNS_15SmallVectorImplIPKcEEbEPNS_3vfs10FileSystemE() {
entry:
%0 = load ptr, ptr null, align 4
%tobool.not.i.i = icmp eq ptr %0, null
br i1 %tobool.not.i.i, label %cleanup.done9, label %if.then.i.i
common.ret: ; preds = %cleanup.done9, %if.then.i.i
%common.ret.op = phi i32 [ 0, %if.then.i.i ], [ 0, %cleanup.done9 ]
ret i32 %common.ret.op
if.then.i.i: ; preds = %entry
%1 = atomicrmw sub ptr null, i32 0 monotonic, align 4
br label %common.ret
cleanup.done9: ; preds = %entry
call void @llvm.memset.p0.i64(ptr null, i8 0, i64 19, i1 false)
br label %common.ret
}
; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr writeonly captures(none), i8, i64, i1 immarg) #0
attributes #0 = { nocallback nofree nounwind willreturn memory(argmem: write) }
```
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