https://llvm.org/bugs/show_bug.cgi?id=25571
Bug ID: 25571
Summary: [AArch64] Assert when SelectBitfieldInsertOp
Product: new-bugs
Version: unspecified
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: weimi...@codeaurora.org
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Created attachment 15313
--> https://llvm.org/bugs/attachment.cgi?id=15313&action=edit
llc test case
For the following code, in
isBitfieldInsertOpFromOr, the NumberOfIgnoredHighBits becomes zero when handlng
the %or
while.body:
%conv = zext i8 %a to i32 ; 0 0 0 0 A
%shl = shl i32 %b, 8 ; B2 B1 B0 0
%or = or i32 %conv, %shl ; B2 B1 B0 A
%shl.1 = shl i32 %or, 8 ; B1 B0 A 0
%or.1 = or i32 %conv, %shl.1 ; B1 B0 A A
%shl.2 = shl i32 %or.1, 8 ; B0 A A 0
%or.2 = or i32 %conv, %shl.2 ; B0 A A A
%shl.3 = shl i32 %or.2, 8 ; A A A 0
%or.3 = or i32 %conv, %shl.3 ; A A A A
%shl.4 = shl i32 %or.3, 8 ; A A A 0
ret i32 %shl.4
}
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