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Fix a CodeGenDAGPatterns bug. Check if top level predicates match when it's looking for duplicates.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74276 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2009-06-26 05:59:16 +00:00
parent 0b0deab464
commit c0ad80fd9e
3 changed files with 30 additions and 0 deletions
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13
test/CodeGen/ARM/orn.ll Normal file
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@ -0,0 +1,13 @@
; RUN: llvm-as < %s | llc -march=arm | grep {bic\\W*r\[0-9\]*,\\W*r\[0-9\]*,\\W*r\[0-9\]*} | Count 2
define i32 @f1(i32 %a, i32 %b) {
%tmp = xor i32 %b, 4294967295
%tmp1 = and i32 %a, %tmp
ret i32 %tmp1
}
define i32 @f2(i32 %a, i32 %b) {
%tmp = xor i32 %b, 4294967295
%tmp1 = and i32 %tmp, %a
ret i32 %tmp1
}

13
test/CodeGen/Thumb2/thumb2-orn.ll Normal file
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@ -0,0 +1,13 @@
; RUN: llvm-as < %s | llc -march=thumb -mattr=+thumb2 | grep {bic\\W*r\[0-9\]*,\\W*r\[0-9\]*,\\W*r\[0-9\]*} | Count 2
define i32 @f1(i32 %a, i32 %b) {
%tmp = xor i32 %b, 4294967295
%tmp1 = and i32 %a, %tmp
ret i32 %tmp1
}
define i32 @f2(i32 %a, i32 %b) {
%tmp = xor i32 %b, 4294967295
%tmp1 = and i32 %tmp, %a
ret i32 %tmp1
}

4
utils/TableGen/CodeGenDAGPatterns.cpp
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@ -2390,6 +2390,10 @@ void CodeGenDAGPatterns::GenerateVariants() {
// Scan to see if an instruction or explicit pattern already matches this.
bool AlreadyExists = false;
for (unsigned p = 0, e = PatternsToMatch.size(); p != e; ++p) {
// Skip if the top level predicates do not match.
if (PatternsToMatch[i].getPredicates() !=
PatternsToMatch[p].getPredicates())
continue;
// Check to see if this variant already exists.
if (Variant->isIsomorphicTo(PatternsToMatch[p].getSrcPattern(), DepVars)) {
DOUT << " *** ALREADY EXISTS, ignoring variant.\n";