| /* { dg-do compile } */ |
| /* { dg-options "-march=celledp -O1" } */ |
| /* { dg-final { scan-assembler "dfceq" } } */ |
| |
| /* GCC previously transformed an "a <= b" test into "! (a > b)" when |
| compiling with -march=celledp, so that the dfcgt instruction can be |
| used to implement the comparison. |
| |
| However, this transformation violates the IEEE-754 standard in the |
| presence of NaN values. If either a or b is a NaN, a <= b should |
| evaluate to false according to IEEE rules. However, after the |
| transformation, a > b as implemented by dfcgt itself returns false, |
| so the transformed test returns true. |
| |
| Note that the equivalent transformation is valid for single- |
| precision floating-point values on the Cell SPU, because the format |
| does not have NaNs. It is invalid for double-precision, even on |
| Cell, however. */ |
| |
| int test (double a, double b) __attribute__ ((noinline)); |
| int test (double a, double b) |
| { |
| return a <= b; |
| } |
| |
| int main (void) |
| { |
| double x = 0.0; |
| double y = 0.0/0.0; |
| return test (x, y); |
| } |