texelFetch(ld opcodes) assumes swizzles are always in xyzw order

[albertodemichelis]

texelFetch(ld opcodes) is assuming that the "operand 2" swizzle is always in the xyzw order
I'm not sure if this problem only occurs in texelFetch it might occur in othe instructions

here's a shader that reproduces the problem(it fetches a texture with a yzw swizzle)

---

INPUT

uniform sampler2D ITex0;

struct VS_POSTFX_OUT
{
float4 pos : SV_Position;
float2 uv : TEXCOORD0;
};

// pixel shader

struct PS_POSTFX_OUT
{
float4 color : SV_Target;
};

PS_POSTFX_OUT
PS_POSTFX(VS_POSTFX_OUT input)
{
PS_POSTFX_OUT output = (PS_POSTFX_OUT)0;

int3 screenuv = int3(input.pos.x, input.pos.y, 0);
float4 outputcolor = ITex0.Load(screenuv).xyzw;
output.color = float4(outputcolor.yzw, 1.0f);

return output;

}

---

ASSEMBLY

//
// Generated by Microsoft (R) HLSL Shader Compiler 6.3.9600.16384
//
//
// Resource Bindings:
//
// Name Type Format Dim Slot Elements
// ------------------------------ ---------- ------- ----------- ---- --------
// ITex0 texture float4 2d 0 1
//
//
//
// Input signature:
//
// Name Index Mask Register SysValue Format Used
// -------------------- ----- ------ -------- -------- ------- ------
// SV_Position 0 xyzw 0 POS float xy
// TEXCOORD 0 xy 1 NONE float
//
//
// Output signature:
//
// Name Index Mask Register SysValue Format Used
// -------------------- ----- ------ -------- -------- ------- ------
// SV_Target 0 xyzw 0 TARGET float xyzw
//
ps_5_0
dcl_globalFlags refactoringAllowed
dcl_resource_texture2d (float,float,float,float) t0
dcl_input_ps_siv linear noperspective v0.xy, position
dcl_output o0.xyzw
dcl_temps 1
0: ftoi r0.xy, v0.xyxx
1: mov r0.zw, l(0,0,0,0)
2: ld_indexable(texture2d)(float,float,float,float) r0.xyz, r0.xyzw, t0.yzwx
3: mov o0.xyz, r0.xyzx
4: mov o0.w, l(1.000000)
5: ret
// Approximately 6 instruction slots used

---

OUTPUT

subroutine void SubroutineType();
struct vec1 {
float x;
};
struct uvec1 {
uint x;
};
struct ivec1 {
int x;
};
layout(std140) uniform;
uniform sampler2D ITex0;
vec4 Input0;
layout(location = 0) out vec4 SV_Target0;

define Output0 SV_Target0

vec4 Temp[1];
ivec4 Temp_int[1];
uvec4 Temp_uint[1];
void main()
{
//--- Start Early Main ---
Input0.xy = gl_FragCoord.xy;
//--- End Early Main ---
//Instruction 6
//FTOI
Temp_int[0].xy = ivec4(Input0.xyxx).xy;
//Instruction 7
//MOV
Temp_int[0].zw = ivec2(0x0, 0x0);
//Instruction 8
//LD
Temp_int[0].xyz = floatBitsToInt(texelFetch(ITex0, Temp_int[0].xy, 0).xyz); //this should be "texelFetch(ITex0, Temp_int[0].xy, 0).xzw"
//Instruction 9
//MOV
Output0.xyz = intBitsToFloat(Temp_int[0].xyz);
//Instruction 10
//MOV
Output0.w = 1.000000;
//Instruction 11
//RET
return;
}

thank you for your time
Alberto