Antonio Maiorano d388bc9b36 Restore "MSL writer: make signed int overflow defined behaviour"
This reverts commit e33b0baa088146fc06881387157a92e19fcf5b7b.

Added tests/expressions/literals/intmin.wgsl test.

Bug: tint:124
Change-Id: I3d46f939ff20fa377ddb5fcb52f9afe728b8e430
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/60441
Kokoro: Kokoro <noreply+kokoro@google.com>
Commit-Queue: Antonio Maiorano <amaiorano@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
Reviewed-by: David Neto <dneto@google.com>
2021-07-30 18:59:06 +00:00

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#include <metal_stdlib>
using namespace metal;
struct main_out {
float4 x_GLF_color_1;
};
struct tint_symbol_1 {
float4 x_GLF_color_1 [[color(0)]];
};
void main_1(thread float4* const tint_symbol_4) {
bool b = false;
int i = 0;
float a = 0.0f;
b = false;
i = 1;
while (true) {
int const x_7 = i;
if ((x_7 > 0)) {
} else {
break;
}
int const x_8 = i;
a = (3.0f - float(x_8));
float const x_40 = a;
if (((2.0f - x_40) == 0.0f)) {
b = true;
}
{
int const x_9 = i;
i = as_type<int>((as_type<uint>(x_9) - as_type<uint>(1)));
}
}
bool const x_45 = b;
if (x_45) {
*(tint_symbol_4) = float4(1.0f, 0.0f, 0.0f, 1.0f);
} else {
*(tint_symbol_4) = float4(0.0f, 0.0f, 0.0f, 0.0f);
}
return;
}
fragment tint_symbol_1 tint_symbol() {
thread float4 tint_symbol_5 = 0.0f;
main_1(&(tint_symbol_5));
main_out const tint_symbol_2 = {.x_GLF_color_1=tint_symbol_5};
tint_symbol_1 const tint_symbol_3 = {.x_GLF_color_1=tint_symbol_2.x_GLF_color_1};
return tint_symbol_3;
}