[llvm-bugs] [Bug 47910] New: [RISCV] Handle long conditional branch

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=47910

            Bug ID: 47910
           Summary: [RISCV] Handle long conditional branch
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: Hsiangkai at gmail.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org

Created attachment 24079
  --> https://bugs.llvm.org/attachment.cgi?id=24079&action=edit
Test file for long conditional branch.

For RISC-V conditional branch, the branch targets should be within +-4K off pc.
If the branch target is out of range, one possible solution is to relax it
using other instructions. In current RISC-V implementation, we only issue error
messages for users. It looks like

$ llvm-mc -arch=riscv64 -filetype=obj test.s
test-2.s:4:9: error: fixup value out of range
        bne     a0, a1, .L1
        ^
test-2.s:10:9: error: fixup value out of range
        beqz    a0, .L2
        ^

We should help users to relax conditional branches if possible.

-- 
You are receiving this mail because:
You are on the CC list for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-bugs/attachments/20201020/2e78879a/attachment.html>