nir/loop_analyze: Treat do{}while(false) loops as 0 iterations
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> (cherry picked from commit e71fc7f2)
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