https://bugs.llvm.org/show_bug.cgi?id=40974
Bug ID: 40974
Summary: [MIR] Simplify CFG: turn conditional jump into an
unconditional one.
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Common Code Generator Code
Assignee: unassignedb...@nondot.org
Reporter: lebedev...@gmail.com
CC: llvm-bugs@lists.llvm.org
Created attachment 21566
--> https://bugs.llvm.org/attachment.cgi?id=21566&action=edit
Input IR
Came up in https://reviews.llvm.org/D59001
If the target does not have CMOV, we will expand it to branch.
If CMOV was i16 and we promoted it to i32, then the
MIR/ASM ends up with one conditional branch and one unconditional branch.
BUT.
If CMOV was i16 and we did not promote it to i32, then the
MIR/ASM ends up with two conditional branches based on the same condition.
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