Examples of errors detected by the V751 diagnostic

V751. Parameter is not used inside function's body.

Overgrowth

V751 [CERT-MSC13-C] Parameter 'rayTo' is not used inside function body. btSoftBody.cpp 2148

 btScalar btSoftBody::RayFromToCaster::rayFromToTriangle( const btVector3& rayFrom, const btVector3& rayTo, const btVector3& rayNormalizedDirection, const btVector3& a, const btVector3& b, const btVector3& c, btScalar maxt) { static const btScalar ceps = -SIMD_EPSILON * 10; static const btScalar teps = SIMD_EPSILON * 10; const btVector3 n = btCross(b - a, c - a); const btScalar d = btDot(a, n); const btScalar den = btDot(rayNormalizedDirection, n); if (!btFuzzyZero(den)) { const btScalar num = btDot(rayFrom, n) - d; const btScalar t = -num / den; if ((t > teps) && (t < maxt)) { const btVector3 hit = rayFrom + rayNormalizedDirection * t; if ((btDot(n, btCross(a - hit, b - hit)) > ceps) && (btDot(n, btCross(b - hit, c - hit)) > ceps) && (btDot(n, btCross(c - hit, a - hit)) > ceps)) { return (t); } } } return (-1); } 

Bullet Physics SDK

V751 Parameter 'halfExtentsZ' is not used inside function body. TinyRenderer.cpp 375

 void TinyRenderObjectData::createCube(float halfExtentsX, float halfExtentsY, float halfExtentsZ, ....) { .... m_model->addVertex(halfExtentsX * cube_vertices_textured[i * 9], halfExtentsY * cube_vertices_textured[i * 9 + 1], halfExtentsY * cube_vertices_textured[i * 9 + 2], cube_vertices_textured[i * 9 + 4], ....); .... } 

Godot Engine

V751 Parameter 'p_y' is not used inside function body. texture.cpp 1085

 bool AtlasTexture::is_pixel_opaque(int p_x, int p_y) const { if (atlas.is_valid()) { return atlas->is_pixel_opaque(p_x + region.position.x + margin.position.x, p_x + region.position.y + margin.position.y); } return true; } 

System Shock

V751 Parameter 'Y' is not used inside function body. BTEST.C 67

 fix Terrain( fix X, fix Y, int deriv ) { if( deriv == 0 ) return fix_mul(...., (X - ....) ); if( deriv == 1 ) return fix_mul(...., (X - ....) ); if( deriv == 2 ) return 0; return 0; } 

HarfBuzz

V751 Parameter 'right' is not used inside function body. hb-ot-kern-table.hh 115

 inline int get_kerning (hb_codepoint_t left, hb_codepoint_t right, const char *end) const { unsigned int l = (this+leftClassTable).get_class (left); unsigned int r = (this+leftClassTable).get_class (left); // <= unsigned int offset = l * rowWidth + r * sizeof (FWORD); .... } 

Nice error due to Copy-Paste. One copied the line, but forgot to change the left with right twice.

Steinberg SDKs

V751 Parameter 'column' is not used inside function body. pitchnamesdatabrowsersource.cpp 227

 void PitchNamesDataBrowserSource::dbCellTextChanged( int32_t row, int32_t column, ....) { if (pitchnames) { UString128 str (newText); if (str.getLength () == 0) pitchnames->removePitchName (0, (int16)row); else pitchnames->setPitchName (0, (int16)row, str); } } 

Valgrind

V751 Parameter 'i2' is not used inside function body. host_tilegx_defs.c 1223

 void genReload_TILEGX ( /*OUT*/ HInstr ** i1, /*OUT*/ HInstr ** i2, HReg rreg, Int offsetB ) { TILEGXAMode *am; vassert(!hregIsVirtual(rreg)); am = TILEGXAMode_IR(offsetB, TILEGXGuestStatePointer()); switch (hregClass(rreg)) { case HRcInt64: *i1 = TILEGXInstr_Load(8, rreg, am); // <= break; case HRcInt32: *i1 = TILEGXInstr_Load(4, rreg, am); // <= break; default: ppHRegClass(hregClass(rreg)); vpanic("genReload_TILEGX: unimplemented regclass"); break; } } 

Similar errors can be found in some other places:

• V751 Parameter 'i2' is not used inside function body. host_mips_defs.c 2000

Linux Kernel

V751 Parameter 'LCDheight' is not used inside function body. init.c 339

 static unsigned short SiS_GetModeID(int VGAEngine, unsigned int VBFlags, int HDisplay, int VDisplay, int Depth, bool FSTN, int LCDwidth, int LCDheight) { unsigned short ModeIndex = 0; switch(HDisplay) { case 320: if(VDisplay == 200) ModeIndex = ModeIndex_320x200[Depth]; else if(VDisplay == 240) { if((VBFlags & CRT2_LCD) && (FSTN)) ModeIndex = ModeIndex_320x240_FSTN[Depth]; else ModeIndex = ModeIndex_320x240[Depth]; } break; case 400: if((!(VBFlags & CRT1_LCDA)) || ((LCDwidth >= 800) && (LCDwidth >= 600))) { // <= if(VDisplay == 300) ModeIndex = ModeIndex_400x300[Depth]; } break; case 512: if((!(VBFlags & CRT1_LCDA)) || ((LCDwidth >= 1024) && (LCDwidth >= 768))) { // <= if(VDisplay == 384) ModeIndex = ModeIndex_512x384[Depth]; } break; .... } return ModeIndex; }