[llvm] 0248725 - [RISCV] Correct Branch Range (#142705)

[via llvm-commits]

Author: Sam Elliott
Date: 2025-06-04T08:35:40-07:00
New Revision: 0248725699cb639fc816acfc3e34d0a7dbf59329

URL: https://github.com/llvm/llvm-project/commit/0248725699cb639fc816acfc3e34d0a7dbf59329
DIFF: https://github.com/llvm/llvm-project/commit/0248725699cb639fc816acfc3e34d0a7dbf59329.diff

LOG: [RISCV] Correct Branch Range (#142705)

This aligns the code with the other cases, which take into account the
min/max range of `isShiftedInt<N, 1>`. Given IALIGN is always 16 or 32
(bits), this should not make a difference to anything valid.

Added: 
    

Modified: 
    llvm/lib/Target/RISCV/MCTargetDesc/RISCVAsmBackend.cpp

Removed: 
    


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diff  --git a/llvm/lib/Target/RISCV/MCTargetDesc/RISCVAsmBackend.cpp b/llvm/lib/Target/RISCV/MCTargetDesc/RISCVAsmBackend.cpp
index 44b1a83c5c17c..424c3fe5f829f 100644
--- a/llvm/lib/Target/RISCV/MCTargetDesc/RISCVAsmBackend.cpp
+++ b/llvm/lib/Target/RISCV/MCTargetDesc/RISCVAsmBackend.cpp
@@ -134,8 +134,8 @@ bool RISCVAsmBackend::fixupNeedsRelaxationAdvanced(const MCFixup &Fixup,
   case RISCV::fixup_riscv_branch:
   case RISCV::fixup_riscv_qc_e_branch:
     // For conditional branch instructions the immediate must be
-    // in the range [-4096, 4095].
-    return !isInt<13>(Offset);
+    // in the range [-4096, 4094].
+    return Offset > 4094 || Offset < -4096;
   }
 }