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Add a totally synthetic situation I came up with while looking at a bug in

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related code.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65437 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky 2009-02-25 06:52:48 +00:00
parent 74c80df2b8
commit 20babb112c
1 changed files with 17 additions and 0 deletions
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17
lib/Target/README.txt
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@ -1690,6 +1690,7 @@ For example: store of float into { {{}}, float } could be turned into a store to
the float directly.
//===---------------------------------------------------------------------===//
#include <math.h>
double foo(double a) { return sin(a); }
@ -1704,3 +1705,19 @@ vs:
foo:
jmp sin
//===---------------------------------------------------------------------===//
Instcombine should replace the load with a constant in:
static const char x[4] = {'a', 'b', 'c', 'd'};
unsigned int y(void) {
return *(unsigned int *)x;
}
It currently only does this transformation when the size of the constant
is the same as the size of the integer (so, try x[5]) and the last byte
is a null (making it a C string). There's no need for these restrictions.
//===---------------------------------------------------------------------===//