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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60632 91177308-0d34-0410-b5e6-96231b3b80d8
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Chris Lattner 2008-12-06 22:49:05 +00:00
parent 78a7e7c797
commit f96ca79cf3
1 changed files with 15 additions and 0 deletions
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15
lib/Target/X86/README.txt
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@ -1816,3 +1816,18 @@ like the following:
A similar code sequence works for division.
//===---------------------------------------------------------------------===//
These should compile to the same code, but the later codegen's to useless
instructions on X86. This may be a trivial dag combine (GCC PR7061):
struct s1 { unsigned char a, b; };
unsigned long f1(struct s1 x) {
return x.a + x.b;
}
struct s2 { unsigned a: 8, b: 8; };
unsigned long f2(struct s2 x) {
return x.a + x.b;
}
//===---------------------------------------------------------------------===//