27 lines
731 B
C
27 lines
731 B
C
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/* { dg-do compile { target powerpc*-*-* } } */
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/* { dg-options "-O2" } */
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/* { dg-final { scan-assembler {\mmflr\M.*\mbl\M.*\mmflr\M.*\mbl\M} } } */
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/* This tests if shrink-wrapping for separate components puts a prologue
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inside a loop when that is useful. In this case, it saves the link
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register before each call: both calls happen with probability .10,
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so saving the link register happens with .80 per execution of f on
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average, which is smaller than 1 which you would get if you saved
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it outside the loop. */
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int *a;
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void g(void);
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void f(int x)
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{
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int j;
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for (j = 0; j < 4; j++) {
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if (__builtin_expect(a[j], 0))
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g();
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asm("#" : : : "memory");
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if (__builtin_expect(a[j], 0))
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g();
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a[j]++;
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}
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}
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