Merge pull request #1367 from yuriks/jit-jmp

Shader JIT: Fix off-by-one error when compiling JMPs

src/video_core/shader/shader_jit_x64.cpp

@@ -653,7 +653,7 @@ void JitCompiler::Compile_IF(Instruction instr) {
     FixupBranch b = J_CC(CC_Z, true);
 
     // Compile the code that corresponds to the condition evaluating as true
-    Compile_Block(instr.flow_control.dest_offset - 1);
+    Compile_Block(instr.flow_control.dest_offset);
 
     // If there isn't an "ELSE" condition, we are done here
     if (instr.flow_control.num_instructions == 0) {
@@ -667,7 +667,7 @@ void JitCompiler::Compile_IF(Instruction instr) {
 
     // This code corresponds to the "ELSE" condition
     // Comple the code that corresponds to the condition evaluating as false
-    Compile_Block(instr.flow_control.dest_offset + instr.flow_control.num_instructions - 1);
+    Compile_Block(instr.flow_control.dest_offset + instr.flow_control.num_instructions);
 
     SetJumpTarget(b2);
 }
@@ -691,7 +691,7 @@ void JitCompiler::Compile_LOOP(Instruction instr) {
 
     auto loop_start = GetCodePtr();
 
-    Compile_Block(instr.flow_control.dest_offset);
+    Compile_Block(instr.flow_control.dest_offset + 1);
 
     ADD(32, R(LOOPCOUNT_REG), R(LOOPINC)); // Increment LOOPCOUNT_REG by Z-component
     SUB(32, R(LOOPCOUNT), Imm8(1)); // Increment loop count by 1
@@ -719,12 +719,12 @@ void JitCompiler::Compile_JMP(Instruction instr) {
     SetJumpTarget(b);
 }
 
-void JitCompiler::Compile_Block(unsigned stop) {
+void JitCompiler::Compile_Block(unsigned end) {
     // Save current offset pointer
     unsigned* prev_offset_ptr = offset_ptr;
     unsigned offset = *prev_offset_ptr;
 
-    while (offset <= stop)
+    while (offset < end)
         Compile_NextInstr(&offset);
 
     // Restore current offset pointer

src/video_core/shader/shader_jit_x64.h

@@ -61,7 +61,7 @@ public:
     void Compile_MAD(Instruction instr);
 
 private:
-    void Compile_Block(unsigned stop);
+    void Compile_Block(unsigned end);
     void Compile_NextInstr(unsigned* offset);
 
     void Compile_SwizzleSrc(Instruction instr, unsigned src_num, SourceRegister src_reg, Gen::X64Reg dest);