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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30556 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-09-21 05:46:00 +00:00
parent 9ba46c13bf
commit 60e32b0776
1 changed files with 10 additions and 9 deletions
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19
lib/Target/X86/README.txt
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@ -544,9 +544,9 @@ entry:
br label %cond_true
cond_true: ; preds = %cond_true, %entry
%x.0.0 = phi int [ 0, %entry ], [ %tmp9, %cond_true ] ; <int> [#uses=3]
%t_addr.0.0 = phi int [ %t, %entry ], [ %tmp7, %cond_true ] ; <int> [#uses=1]
%tmp2 = getelementptr int* %a, int %x.0.0 ; <int*> [#uses=1]
%x.0.0 = phi int [ 0, %entry ], [ %tmp9, %cond_true ]
%t_addr.0.0 = phi int [ %t, %entry ], [ %tmp7, %cond_true ]
%tmp2 = getelementptr int* %a, int %x.0.0
%tmp3 = load int* %tmp2 ; <int> [#uses=1]
%tmp5 = add int %t_addr.0.0, %x.0.0 ; <int> [#uses=1]
%tmp7 = add int %tmp5, %tmp3 ; <int> [#uses=2]
@ -633,11 +633,12 @@ LBB1_1: #bb
LBB1_2: #UnifiedReturnBlock
ret
In the code above, the 'if' is turned into a 'switch' at the mid-level. It looks
like the 'lower to branches' mode could be improved a little here. In particular,
the fall-through to LBB1_3 doesn't need a branch. It would also be nice to
eliminate the redundant "cmp 6", maybe by lowering to a linear sequence of
compares if there are below a certain number of cases (instead of a binary sequence)?
In the code above, the 'if' is turned into a 'switch' at the mid-level. It
looks like the 'lower to branches' mode could be improved a little here. In
particular, the fall-through to LBB1_3 doesn't need a branch. It would also be
nice to eliminate the redundant "cmp 6", maybe by lowering to a linear sequence
of compares if there are below a certain number of cases (instead of a binary
sequence)?
//===---------------------------------------------------------------------===//
@ -645,7 +646,7 @@ Compile:
int %test(ulong *%tmp) {
%tmp = load ulong* %tmp ; <ulong> [#uses=1]
%tmp.mask = shr ulong %tmp, ubyte 50 ; <ulong> [#uses=1]
%tmp.mask = cast ulong %tmp.mask to ubyte ; <ubyte> [#uses=1]
%tmp.mask = cast ulong %tmp.mask to ubyte
%tmp2 = and ubyte %tmp.mask, 3 ; <ubyte> [#uses=1]
%tmp2 = cast ubyte %tmp2 to int ; <int> [#uses=1]
ret int %tmp2