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| author | Bill Wendling <isanbard@gmail.com> | 2007-10-02 21:43:06 +0000 |
|---|---|---|
| committer | Bill Wendling <isanbard@gmail.com> | 2007-10-02 21:43:06 +0000 |
| commit | f214ff87014f953269d099b1798a4a662d58dc32 (patch) | |
| tree | f14ed45673838147d6c95fd5b714331542232d71 | |
| parent | 855011e5c643d07a07409e88ea83ae4ffb17b708 (diff) | |
| download | bcm5719-llvm-f214ff87014f953269d099b1798a4a662d58dc32.tar.gz bcm5719-llvm-f214ff87014f953269d099b1798a4a662d58dc32.zip | |
Another missed optimization with LICM.
llvm-svn: 42552
| -rw-r--r-- | llvm/lib/Target/X86/README.txt | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/llvm/lib/Target/X86/README.txt b/llvm/lib/Target/X86/README.txt index 517240480d7..81e9797f05f 100644 --- a/llvm/lib/Target/X86/README.txt +++ b/llvm/lib/Target/X86/README.txt @@ -1283,3 +1283,26 @@ vice-versa). //===---------------------------------------------------------------------===// +For this code: + +cond_next603: ; preds = %bb493, %cond_true336, %cond_next599 + %v.21050.1 = phi i32 [ %v.21050.0, %cond_next599 ], [ %tmp344, %cond_true336 ], [ %v.2, %bb493 ] ; <i32> [#uses=1] + %maxz.21051.1 = phi i32 [ %maxz.21051.0, %cond_next599 ], [ 0, %cond_true336 ], [ %maxz.2, %bb493 ] ; <i32> [#uses=2] + %cnt.01055.1 = phi i32 [ %cnt.01055.0, %cond_next599 ], [ 0, %cond_true336 ], [ %cnt.0, %bb493 ] ; <i32> [#uses=2] + %byteptr.9 = phi i8* [ %byteptr.12, %cond_next599 ], [ %byteptr.0, %cond_true336 ], [ %byteptr.10, %bb493 ] ; <i8*> [#uses=9] + %bitptr.6 = phi i32 [ %tmp5571104.1, %cond_next599 ], [ %tmp4921049, %cond_true336 ], [ %bitptr.7, %bb493 ] ; <i32> [#uses=4] + %source.5 = phi i32 [ %tmp602, %cond_next599 ], [ %source.0, %cond_true336 ], [ %source.6, %bb493 ] ; <i32> [#uses=7] + %tmp606 = getelementptr %struct.const_tables* @tables, i32 0, i32 0, i32 %cnt.01055.1 ; <i8*> [#uses=1] + %tmp607 = load i8* %tmp606, align 1 ; <i8> [#uses=1] + +We produce this: + +LBB4_70: # cond_next603 + movl -20(%ebp), %esi + movl L_tables$non_lazy_ptr-"L4$pb"(%esi), %esi + +However, ICC caches this information before the loop and produces this: + + movl 88(%esp), %eax #481.12 + +//===---------------------------------------------------------------------===// |
