58 lines
1.5 KiB
C
58 lines
1.5 KiB
C
/* Test division by const int generates only one shift. */
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/* { dg-do run } */
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/* { dg-options "-O2 -fdump-rtl-combine-all" } */
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/* { dg-options "-O2 -fdump-rtl-combine-all -mtune=cortex-a53" { target aarch64*-*-* } } */
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/* { dg-require-effective-target int32plus } */
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extern void abort (void);
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#define NOINLINE __attribute__((noinline))
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static NOINLINE int
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f1 (int n)
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{
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return n / 33;
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}
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static NOINLINE int
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f2 (int n)
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{
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return n / 77;
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}
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int
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main ()
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{
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int a = 0xaaaaaaaa;
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int b = 0x55555555;
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int c;
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c = f1 (a);
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if (c != 0xfd6a052c)
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abort ();
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c = f1 (b);
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if (c != 0x295FAD4)
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abort ();
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c = f2 (a);
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if (c != 0xfee44b5c)
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abort ();
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c = f2 (b);
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if (c != 0x11bb4a4)
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abort ();
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return 0;
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}
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/* Following replacement pattern of intger division by constant, GCC is expected
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to generate MULT and (x)SHIFTRT. This test checks that considering division
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by const 33, gcc generates a single ASHIFTRT by 35, instead of two - LSHIFTRT
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by 32 and ASHIFTRT by 3. */
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/* { dg-final { scan-rtl-dump "\\(set \\(subreg:DI \\(reg:SI" "combine" { target aarch64*-*-* } } } */
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/* { dg-final { scan-rtl-dump "\\(ashiftrt:DI \\(reg:DI" "combine" { target aarch64*-*-* } } } */
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/* { dg-final { scan-rtl-dump "\\(const_int 35 " "combine" { target aarch64*-*-* } } } */
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/* Similarly, considering division by const 77, gcc generates a single ASHIFTRT
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by 36, instead of two - LSHIFTRT by 32 and ASHIFTRT by 4. */
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/* { dg-final { scan-rtl-dump "\\(const_int 36 " "combine" { target aarch64*-*-* } } } */
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