http://llvm.org/bugs/show_bug.cgi?id=22856
Bug ID: 22856
Summary: Invalid IR generated at -O1 and above (instruction
does not dominate uses)
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Loop Optimizer
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 14012
--> http://llvm.org/bugs/attachment.cgi?id=14012&action=edit
failing test case
Some pass appears to be making invalid IR for the attached reduced test case.
Compiles fine with -O0. -print-after-all reveals the following invalid basic
block appearing after codegen prepare:
block_C: ; preds = %block_E, %block_A
%iv3 = phi i64 [ %2, %block_E ], [ %0, %block_A ]
%lsr = trunc i64 %2 to i32
%1 = add nsw i64 %iv3, 2
%2 = add nsw i64 %iv3, 1
br i1 undef, label %block_D, label %block_E
%2 is used before it is defined
I made a guess that something goes awry in the loop optimizer.
--
You are receiving this mail because:
You are on the CC list for the bug.
_______________________________________________
LLVMbugs mailing list
[email protected]
http://lists.cs.uiuc.edu/mailman/listinfo/llvmbugs
