diff options
| -rw-r--r-- | lib/Target/X86/README.txt | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/lib/Target/X86/README.txt b/lib/Target/X86/README.txt index 7705c1ba31..8effd47766 100644 --- a/lib/Target/X86/README.txt +++ b/lib/Target/X86/README.txt @@ -1552,3 +1552,24 @@ _foo: andl $65535, %eax ret +//===---------------------------------------------------------------------===// + +We're missing an obvious fold of a load into imul: + +int test(long a, long b) { return a * b; } + +LLVM produces: +_test: + movl 4(%esp), %ecx + movl 8(%esp), %eax + imull %ecx, %eax + ret + +vs: +_test: + movl 8(%esp), %eax + imull 4(%esp), %eax + ret + +//===---------------------------------------------------------------------===// + |