diff options
| -rw-r--r-- | llvm/lib/Target/README.txt | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/llvm/lib/Target/README.txt b/llvm/lib/Target/README.txt index 09e5433578c..341c5c1ff47 100644 --- a/llvm/lib/Target/README.txt +++ b/llvm/lib/Target/README.txt @@ -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. + +//===---------------------------------------------------------------------===// + |
