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Correct over optimization of pre-initialized variables (#6500)

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* Correct over optimization of pre-initialized variables

NEAR_ZERO() works most of the time...  But it leaves corner cases
uncovered.  We need to explicitly check if these variables are +/-
infinity.

* Correct over optimization of pre-initialized variables
This commit is contained in:
Roxy-3D
2017-04-29 22:01:29 -05:00
committed by GitHub
parent 6424068412
commit 2509587b5a
1 changed files with 5 additions and 3 deletions
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8
Marlin/ubl_motion.cpp
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@@ -250,8 +250,10 @@
const float m = dy / dx, const float m = dy / dx,
c = start[Y_AXIS] - m * start[X_AXIS]; c = start[Y_AXIS] - m * start[X_AXIS];
const bool inf_normalized_flag = NEAR_ZERO(on_axis_distance), bool inf_normalized_flag, inf_m_flag;
inf_m_flag = NEAR_ZERO(dx);
inf_normalized_flag = isinf(e_normalized_dist);
inf_m_flag = isinf(m);
/** /**
* This block handles vertical lines. These are lines that stay within the same * This block handles vertical lines. These are lines that stay within the same
@@ -265,7 +267,7 @@
const float next_mesh_line_y = LOGICAL_Y_POSITION(pgm_read_float(&(ubl.mesh_index_to_ypos[current_yi]))); const float next_mesh_line_y = LOGICAL_Y_POSITION(pgm_read_float(&(ubl.mesh_index_to_ypos[current_yi])));
/** /**
* inf_m_flag? the slope of the line is infinite, we won't do the calculations * if the slope of the line is infinite, we won't do the calculations
* else, we know the next X is the same so we can recover and continue! * else, we know the next X is the same so we can recover and continue!
* Calculate X at the next Y mesh line * Calculate X at the next Y mesh line
*/ */