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annotate gcc/testsuite/gcc.dg/pr56997-4.c @ 131:84e7813d76e9

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gcc-8.2
author mir3636
date Thu, 25 Oct 2018 07:37:49 +0900
parents 04ced10e8804
children
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111
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1 /* Test volatile access to unaligned field. */
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2 /* { dg-do compile } */
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3 /* { dg-options "-fno-strict-volatile-bitfields -fdump-rtl-final" } */
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4
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5 #define test_type unsigned short
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6
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7 typedef struct s{
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8 unsigned char Prefix[1];
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9 volatile test_type Type;
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10 }__attribute((__packed__,__aligned__(4))) ss;
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11
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12 extern volatile ss v;
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13
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14 void
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15 foo (test_type u)
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16 {
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17 v.Type = u;
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18 }
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19
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20 /* The C++ memory model forbids data store race conditions outside the
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21 unaligned data member, therefore only QI or HI access is allowed, no SI. */
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22 /* { dg-final { scan-rtl-dump-not "mem/v(/.)*:SI" "final" } } */