Loops like:
block block_0:
vec1 32 ssa_2 = load_const (0x00000020)
vec1 32 ssa_3 = load_const (0x00000001)
loop {
vec1 32 ssa_7 = phi block_0: ssa_3, block_4: ssa_9
vec1 1 ssa_8 = ige ssa_2, ssa_7
if ssa_8 {
break
} else {
}
vec1 32 ssa_9 = iadd ssa_7, ssa_1
}
Were treated as having more than 1 iteration and after unrolling
produced wrong results, however such loop will exit during
the first iteration if not unrolled.
So we check if loop will actually loop.
Fixes tests/shaders/glsl-fs-loop-while-false-02.shader_test
Signed-off-by: Danylo Piliaiev <danylo.piliaiev@globallogic.com>
Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>
e71fc7f238