diff --git a/renderdoc/driver/shaders/spirv/spirv_debug.cpp b/renderdoc/driver/shaders/spirv/spirv_debug.cpp
index 2cc6e6c1a..5503abe1b 100644
--- a/renderdoc/driver/shaders/spirv/spirv_debug.cpp
+++ b/renderdoc/driver/shaders/spirv/spirv_debug.cpp
@@ -27,10 +27,6 @@
 #include "common/formatting.h"
 #include "spirv_op_helpers.h"
 
-#if defined(_MSC_VER)
-#define finite _finite
-#endif
-
 static bool ContainsNaNInf(const ShaderVariable &val)
 {
   bool ret = false;
@@ -1878,6 +1874,8 @@ void ThreadState::StepNext(ShaderDebugState *state, const rdcarray<ThreadState>
     case Op::PtrCastToGeneric:
     case Op::GenericCastToPtr:
     case Op::GenericCastToPtrExplicit:
+    case Op::SizeOf:
+    case Op::CopyMemorySized:
     case Op::IsFinite:
     case Op::IsNormal:
     case Op::SignBitSet:
diff --git a/renderdoc/driver/shaders/spirv/spirv_debug_glsl450.cpp b/renderdoc/driver/shaders/spirv/spirv_debug_glsl450.cpp
index c927f2fbe..722984d23 100644
--- a/renderdoc/driver/shaders/spirv/spirv_debug_glsl450.cpp
+++ b/renderdoc/driver/shaders/spirv/spirv_debug_glsl450.cpp
@@ -25,10 +25,6 @@
 #include "spirv_debug.h"
 #include <math.h>
 
-#if defined(_MSC_VER)
-#define finite _finite
-#endif
-
 namespace rdcspv
 {
 namespace glsl
@@ -53,6 +49,18 @@ ShaderVariable FAbs(ThreadState &state, const rdcarray<Id> &params)
   return var;
 }
 
+ShaderVariable SAbs(ThreadState &state, const rdcarray<Id> &params)
+{
+  CHECK_PARAMS(1);
+
+  ShaderVariable var = state.GetSrc(params[0]);
+
+  for(uint32_t c = 0; c < var.columns; c++)
+    var.value.iv[c] = abs(var.value.iv[c]);
+
+  return var;
+}
+
 ShaderVariable Floor(ThreadState &state, const rdcarray<Id> &params)
 {
   CHECK_PARAMS(1);
@@ -266,6 +274,71 @@ ShaderVariable Cross(ThreadState &state, const rdcarray<Id> &params)
 
   return var;
 }
+
+static float GLSLNMax(float x, float y)
+{
+  const bool xnan = isnan(x);
+  const bool ynan = isnan(y);
+  if(xnan && !ynan)
+    return y;
+  else if(!xnan && ynan)
+    return x;
+  else
+    return x < y ? y : x;
+}
+
+static float GLSLNMin(float x, float y)
+{
+  const bool xnan = isnan(x);
+  const bool ynan = isnan(y);
+  if(xnan && !ynan)
+    return y;
+  else if(!xnan && ynan)
+    return x;
+  else
+    return y < x ? y : x;
+}
+
+ShaderVariable NMin(ThreadState &state, const rdcarray<Id> &params)
+{
+  CHECK_PARAMS(2);
+
+  ShaderVariable var = state.GetSrc(params[0]);
+  ShaderVariable y = state.GetSrc(params[1]);
+
+  for(uint32_t c = 0; c < var.columns; c++)
+    var.value.fv[c] = GLSLNMin(var.value.fv[c], y.value.fv[c]);
+
+  return var;
+}
+
+ShaderVariable NMax(ThreadState &state, const rdcarray<Id> &params)
+{
+  CHECK_PARAMS(2);
+
+  ShaderVariable var = state.GetSrc(params[0]);
+  ShaderVariable y = state.GetSrc(params[1]);
+
+  for(uint32_t c = 0; c < var.columns; c++)
+    var.value.fv[c] = GLSLNMax(var.value.fv[c], y.value.fv[c]);
+
+  return var;
+}
+
+ShaderVariable NClamp(ThreadState &state, const rdcarray<Id> &params)
+{
+  CHECK_PARAMS(3);
+
+  ShaderVariable var = state.GetSrc(params[0]);
+  ShaderVariable minVal = state.GetSrc(params[1]);
+  ShaderVariable maxVal = state.GetSrc(params[2]);
+
+  for(uint32_t c = 0; c < var.columns; c++)
+    var.value.fv[c] = GLSLNMin(GLSLNMax(var.value.fv[c], minVal.value.fv[c]), maxVal.value.fv[c]);
+
+  return var;
+}
+
 };    // namespace glsl
 
 void ConfigureGLSLStd450(ExtInstDispatcher &extinst)
@@ -278,6 +351,7 @@ void ConfigureGLSLStd450(ExtInstDispatcher &extinst)
 
 #define EXT(func) extinst.functions[(uint32_t)GLSLstd450::func] = &glsl::func;
   EXT(FAbs);
+  EXT(SAbs);
   EXT(Floor);
   EXT(Pow);
   EXT(FMin);
@@ -292,5 +366,8 @@ void ConfigureGLSLStd450(ExtInstDispatcher &extinst)
   EXT(FMix);
   EXT(Cross);
   EXT(Normalize);
+  EXT(NMin);
+  EXT(NMax);
+  EXT(NClamp);
 }
 };    // namespace rdcspv
diff --git a/util/test/demos/vk/vk_shader_debug_zoo.cpp b/util/test/demos/vk/vk_shader_debug_zoo.cpp
index 90d01dffe..553da182d 100644
--- a/util/test/demos/vk/vk_shader_debug_zoo.cpp
+++ b/util/test/demos/vk/vk_shader_debug_zoo.cpp
@@ -441,6 +441,14 @@ void main()
                    1.0f);
       break;
     }
+    case 45:
+    {
+      Color = vec4(float(abs(zeroi+2)),
+                   float(abs(zeroi)),
+                   float(abs(zeroi-5)),
+                   1.0f);
+      break;
+    }
     default: break;
   }
 }