[llvm] r269951 - AMDGPU: Error if branch distance exceeds limit

[Matt Arsenault via llvm-commits]

Author: arsenm
Date: Wed May 18 11:10:24 2016
New Revision: 269951

URL: http://llvm.org/viewvc/llvm-project?rev=269951&view=rev
Log:
AMDGPU: Error if branch distance exceeds limit

Modified:
    llvm/trunk/lib/Target/AMDGPU/MCTargetDesc/AMDGPUAsmBackend.cpp

Modified: llvm/trunk/lib/Target/AMDGPU/MCTargetDesc/AMDGPUAsmBackend.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/AMDGPU/MCTargetDesc/AMDGPUAsmBackend.cpp?rev=269951&r1=269950&r2=269951&view=diff
==============================================================================
--- llvm/trunk/lib/Target/AMDGPU/MCTargetDesc/AMDGPUAsmBackend.cpp (original)
+++ llvm/trunk/lib/Target/AMDGPU/MCTargetDesc/AMDGPUAsmBackend.cpp Wed May 18 11:10:24 2016
@@ -96,8 +96,12 @@ void AMDGPUAsmBackend::applyFixup(const
 
   switch ((unsigned)Fixup.getKind()) {
     case AMDGPU::fixup_si_sopp_br: {
+      int64_t BrImm = (Value - 4) / 4;
+      if (!isInt<16>(BrImm))
+        report_fatal_error("branch size exceeds simm16");
+
       uint16_t *Dst = (uint16_t*)(Data + Fixup.getOffset());
-      *Dst = (Value - 4) / 4;
+      *Dst = BrImm;
       break;
     }