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111
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1 /* The problem in this PR was mostly finding a suitable place to insert
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2 the reciprocals of the function arguments. This test case tries to
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3 test three possible ways of how this may go wrong. */
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4 /* { dg-options "-O2 -ffast-math" } */
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5 /* { dg-do compile } */
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6
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7 /* The original test case. */
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8 double
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9 f1 (double a, double b, double c)
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10 {
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11 double y0;
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12 double y1;
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13
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14 if (a == 0.0)
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15 {
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16 y0 = -c / b;
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17 return y0;
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18 }
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19 y0 = c / b;
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20 y1 = a / b;
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21 return y0 * y1;
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22 }
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23
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24 /* Labels may end up in the middle of a block. Also bad. */
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25 double
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26 f2 (double a, double b, double c)
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27 {
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28 double y0;
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29 double y1;
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30
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31 a_label:
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32 another_label:
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33 if (a == 0.0)
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34 {
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35 y0 = -c / b;
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36 return y0;
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37 }
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38 y0 = c / b;
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39 y1 = a / b;
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40 return y0 * y1;
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41 }
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42
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43 /* Uses must still be dominated by their defs. */
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44 double
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45 f3 (double a, double b, double c)
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46 {
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47 double y0;
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48 double y1;
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49
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50 y0 = -c / b;
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51 if (a == 0.0)
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52 {
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53 return y0;
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54 }
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55 y0 = c / b;
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56 y1 = a / b;
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57 return y0 * y1;
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58 }
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