diff --git a/src/shader_recompiler/backend/glasm/emit_glasm_instructions.h b/src/shader_recompiler/backend/glasm/emit_glasm_instructions.h
index 52420c3c92..d65a474f29 100644
--- a/src/shader_recompiler/backend/glasm/emit_glasm_instructions.h
+++ b/src/shader_recompiler/backend/glasm/emit_glasm_instructions.h
@@ -306,9 +306,9 @@ void EmitISub32(EmitContext& ctx, IR::Inst& inst, ScalarS32 a, ScalarS32 b);
 void EmitISub64(EmitContext& ctx, Register a, Register b);
 void EmitIMul32(EmitContext& ctx, IR::Inst& inst, ScalarS32 a, ScalarS32 b);
 void EmitINeg32(EmitContext& ctx, IR::Inst& inst, ScalarS32 value);
-void EmitINeg64(EmitContext& ctx, Register value);
+void EmitINeg64(EmitContext& ctx, IR::Inst& inst, Register value);
 void EmitIAbs32(EmitContext& ctx, IR::Inst& inst, ScalarS32 value);
-void EmitIAbs64(EmitContext& ctx, Register value);
+void EmitIAbs64(EmitContext& ctx, IR::Inst& inst, Register value);
 void EmitShiftLeftLogical32(EmitContext& ctx, IR::Inst& inst, ScalarU32 base, ScalarU32 shift);
 void EmitShiftLeftLogical64(EmitContext& ctx, Register base, Register shift);
 void EmitShiftRightLogical32(EmitContext& ctx, IR::Inst& inst, ScalarU32 base, ScalarU32 shift);
diff --git a/src/shader_recompiler/backend/glasm/emit_glasm_integer.cpp b/src/shader_recompiler/backend/glasm/emit_glasm_integer.cpp
index 40f48a091e..2be91ccfdd 100644
--- a/src/shader_recompiler/backend/glasm/emit_glasm_integer.cpp
+++ b/src/shader_recompiler/backend/glasm/emit_glasm_integer.cpp
@@ -34,16 +34,16 @@ void EmitINeg32(EmitContext& ctx, IR::Inst& inst, ScalarS32 value) {
     ctx.Add("MOV.S {},-{};", inst, value);
 }
 
-void EmitINeg64([[maybe_unused]] EmitContext& ctx, [[maybe_unused]] Register value) {
-    throw NotImplementedException("GLASM instruction");
+void EmitINeg64(EmitContext& ctx, IR::Inst& inst, Register value) {
+    ctx.LongAdd("MOV.S64 {},-{};", inst, value);
 }
 
 void EmitIAbs32(EmitContext& ctx, IR::Inst& inst, ScalarS32 value) {
     ctx.Add("ABS.S {},{};", inst, value);
 }
 
-void EmitIAbs64([[maybe_unused]] EmitContext& ctx, [[maybe_unused]] Register value) {
-    throw NotImplementedException("GLASM instruction");
+void EmitIAbs64(EmitContext& ctx, IR::Inst& inst, Register value) {
+    ctx.LongAdd("MOV.S64 {},|{}|;", inst, value);
 }
 
 void EmitShiftLeftLogical32(EmitContext& ctx, IR::Inst& inst, ScalarU32 base, ScalarU32 shift) {