48 lines
1.2 KiB
C
48 lines
1.2 KiB
C
/* { dg-do compile } */
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/* { dg-require-effective-target size32plus } */
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/* { dg-options "-fstrict-volatile-bitfields -fdump-rtl-final" } */
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/* With -fstrict-volatile-bitfields, the volatile accesses to bf2.b
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and bf3.b must do unsigned int reads/writes. The non-volatile
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accesses to bf1.b are not so constrained. */
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extern struct
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{
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unsigned int b : 1;
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unsigned int : 31;
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} __attribute__((aligned(4))) bf1;
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extern volatile struct
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{
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unsigned int b : 1;
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unsigned int : 31;
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} __attribute__((aligned(4))) bf2;
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extern struct
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{
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volatile unsigned int b : 1;
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volatile unsigned int : 31;
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} __attribute__((aligned(4))) bf3;
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void writeb(void)
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{
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bf1.b = 1;
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bf2.b = 1; /* volatile read + volatile write */
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bf3.b = 1; /* volatile read + volatile write */
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}
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extern unsigned int x1, x2, x3;
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void readb(void)
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{
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x1 = bf1.b;
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x2 = bf2.b; /* volatile write */
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x3 = bf3.b; /* volatile write */
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}
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/* There should be 6 volatile MEMs total, but scan-rtl-dump-times counts
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the number of match variables and not the number of matches. Since
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the parenthesized subexpression in the regexp introduces an extra match
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variable, we need to give a count of 12 instead of 6 here. */
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/* { dg-final { scan-rtl-dump-times "mem/v(/.)*:SI" 12 "final" } } */
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