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Fix rdar://7517201, a regression introduced by r92849.

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When folding a and(any_ext(load)) both the any_ext and the
load have to have only a single use.

This removes the anyext-uses.ll testcase which started failing
because it is unreduced and unclear what it is testing.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92950 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2010-01-07 21:59:23 +00:00
parent ef7634ca48
commit bd1fccfad5
3 changed files with 24 additions and 51 deletions
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2
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -1895,7 +1895,7 @@ SDValue DAGCombiner::visitAND(SDNode *N) {
? cast<LoadSDNode>(N0.getOperand(0))
: cast<LoadSDNode>(N0);
if (LN0->getExtensionType() != ISD::SEXTLOAD &&
LN0->isUnindexed() && N0.hasOneUse()) {
LN0->isUnindexed() && N0.hasOneUse() && LN0->hasOneUse()) {
uint32_t ActiveBits = N1C->getAPIntValue().getActiveBits();
if (ActiveBits > 0 && APIntOps::isMask(ActiveBits, N1C->getAPIntValue())){
EVT ExtVT = EVT::getIntegerVT(*DAG.getContext(), ActiveBits);

47
test/CodeGen/X86/anyext-uses.ll
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@ -1,47 +0,0 @@
; RUN: llc < %s -march=x86-64 > %t
; RUN: grep mov %t | count 8
; RUN: not grep implicit %t
; Avoid partial register updates; don't define an i8 register and read
; the i32 super-register.
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128"
target triple = "x86_64-apple-darwin9.6"
%struct.RC4_KEY = type { i8, i8, [256 x i8] }
define void @foo(%struct.RC4_KEY* nocapture %key, i64 %len, i8* %indata, i8* %outdata) nounwind {
entry:
br label %bb24
bb24: ; preds = %bb24, %entry
%0 = load i8* null, align 1 ; <i8> [#uses=1]
%1 = zext i8 %0 to i64 ; <i64> [#uses=1]
%2 = shl i64 %1, 32 ; <i64> [#uses=1]
%3 = getelementptr %struct.RC4_KEY* %key, i64 0, i32 2, i64 0 ; <i8*> [#uses=1]
%4 = load i8* %3, align 1 ; <i8> [#uses=2]
%5 = add i8 %4, 0 ; <i8> [#uses=2]
%6 = zext i8 %5 to i64 ; <i64> [#uses=0]
%7 = load i8* null, align 1 ; <i8> [#uses=1]
%8 = zext i8 %4 to i32 ; <i32> [#uses=1]
%9 = zext i8 %7 to i32 ; <i32> [#uses=1]
%10 = add i32 %9, %8 ; <i32> [#uses=1]
%11 = and i32 %10, 255 ; <i32> [#uses=1]
%12 = zext i32 %11 to i64 ; <i64> [#uses=1]
%13 = getelementptr %struct.RC4_KEY* %key, i64 0, i32 2, i64 %12 ; <i8*> [#uses=1]
%14 = load i8* %13, align 1 ; <i8> [#uses=1]
%15 = zext i8 %14 to i64 ; <i64> [#uses=1]
%16 = shl i64 %15, 48 ; <i64> [#uses=1]
%17 = getelementptr %struct.RC4_KEY* %key, i64 0, i32 2, i64 0 ; <i8*> [#uses=1]
%18 = load i8* %17, align 1 ; <i8> [#uses=2]
%19 = add i8 %18, %5 ; <i8> [#uses=1]
%20 = zext i8 %19 to i64 ; <i64> [#uses=1]
%21 = getelementptr %struct.RC4_KEY* %key, i64 0, i32 2, i64 %20 ; <i8*> [#uses=1]
store i8 %18, i8* %21, align 1
%22 = or i64 0, %2 ; <i64> [#uses=1]
%23 = or i64 %22, 0 ; <i64> [#uses=1]
%24 = or i64 %23, %16 ; <i64> [#uses=1]
%25 = or i64 %24, 0 ; <i64> [#uses=1]
%26 = xor i64 %25, 0 ; <i64> [#uses=1]
store i64 %26, i64* null, align 8
br label %bb24
}

26
test/CodeGen/X86/fold-load.ll
View File

@ -1,11 +1,12 @@
; RUN: llc < %s -march=x86
; RUN: llc < %s -march=x86 | FileCheck %s
%struct._obstack_chunk = type { i8*, %struct._obstack_chunk*, [4 x i8] }
%struct.obstack = type { i32, %struct._obstack_chunk*, i8*, i8*, i8*, i32, i32, %struct._obstack_chunk* (...)*, void (...)*, i8*, i8 }
@stmt_obstack = external global %struct.obstack ; <%struct.obstack*> [#uses=1]
define void @expand_start_bindings() {
; This should just not crash.
define void @test1() nounwind {
entry:
br i1 false, label %cond_true, label %cond_next
br i1 true, label %cond_true, label %cond_next
cond_true: ; preds = %entry
%new_size.0.i = select i1 false, i32 0, i32 0 ; <i32> [#uses=1]
@ -25,3 +26,22 @@ cond_false30.i: ; preds = %cond_true
cond_next: ; preds = %entry
ret void
}
define i32 @test2(i16* %P, i16* %Q) nounwind {
%A = load i16* %P, align 4 ; <i16> [#uses=11]
%C = zext i16 %A to i32 ; <i32> [#uses=1]
%D = and i32 %C, 255 ; <i32> [#uses=1]
br label %L
L:
store i16 %A, i16* %Q
ret i32 %D
; CHECK: test2:
; CHECK: movl 4(%esp), %eax
; CHECK-NEXT: movzwl (%eax), %ecx
}