Revert commits 96556 and 96640, because commit 96556 breaks the
dragonegg self-host build. I reverted 96640 in order to revert
96556 (96640 goes on top of 96556), but it also looks like with
both of them applied the breakage happens even earlier. The
symptom of the 96556 miscompile is the following crash:
llvm[3]: Compiling AlphaISelLowering.cpp for Release build
cc1plus: /home/duncan/tmp/tmp/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp:4982: void llvm::SelectionDAG::ReplaceAllUsesWith(llvm::SDNode*, llvm::SDNode*, llvm::SelectionDAG::DAGUpdateListener*): Assertion `(!From->hasAnyUseOfValue(i) || From->getValueType(i) == To->getValueType(i)) && "Cannot use this version of ReplaceAllUsesWith!"' failed.
Stack dump:
0. Running pass 'X86 DAG->DAG Instruction Selection' on function '@_ZN4llvm19AlphaTargetLowering14LowerOperationENS_7SDValueERNS_12SelectionDAGE'
g++: Internal error: Aborted (program cc1plus)
This occurs when building LLVM using LLVM built by LLVM (via
dragonegg). Probably LLVM has miscompiled itself, though it
may have miscompiled GCC and/or dragonegg itself: at this point
of the self-host build, all of GCC, LLVM and dragonegg were built
using LLVM. Unfortunately this kind of thing is extremely hard
to debug, and while I did rummage around a bit I didn't find any
smoking guns, aka obviously miscompiled code.
Found by bisection.
r96556 | evancheng | 2010-02-18 03:13:50 +0100 (Thu, 18 Feb 2010) | 5 lines
Some dag combiner goodness:
Transform br (xor (x, y)) -> br (x != y)
Transform br (xor (xor (x,y), 1)) -> br (x == y)
Also normalize (and (X, 1) == / != 1 -> (and (X, 1)) != / == 0 to match to "test on x86" and "tst on arm"
r96640 | evancheng | 2010-02-19 01:34:39 +0100 (Fri, 19 Feb 2010) | 16 lines
Transform (xor (setcc), (setcc)) == / != 1 to
(xor (setcc), (setcc)) != / == 1.
e.g. On x86_64
%0 = icmp eq i32 %x, 0
%1 = icmp eq i32 %y, 0
%2 = xor i1 %1, %0
br i1 %2, label %bb, label %return
=>
testl %edi, %edi
sete %al
testl %esi, %esi
sete %cl
cmpb %al, %cl
je LBB1_2
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96672 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-19 11:30:41 +00:00
|
|
|
; RUN: llc < %s -mtriple=i386-apple-darwin -tailcallopt=false -stats -info-output-file - | grep asm-printer | grep 31
|
2008-12-19 18:03:11 +00:00
|
|
|
|
|
|
|
|
%CC = type { %Register }
|
|
|
|
|
%II = type { %"struct.XX::II::$_74" }
|
|
|
|
|
%JITFunction = type %YYValue* (%CC*, %YYValue**)
|
|
|
|
|
%YYValue = type { i32 (...)** }
|
|
|
|
|
%Register = type { %"struct.XX::ByteCodeFeatures" }
|
|
|
|
|
%"struct.XX::ByteCodeFeatures" = type { i32 }
|
|
|
|
|
%"struct.XX::II::$_74" = type { i8* }
|
|
|
|
|
@llvm.used = appending global [1 x i8*] [ i8* bitcast (%JITFunction* @loop to i8*) ], section "llvm.metadata" ; <[1 x i8*]*> [#uses=0]
|
|
|
|
|
|
|
|
|
|
define %YYValue* @loop(%CC*, %YYValue**) nounwind {
|
|
|
|
|
; <label>:2
|
|
|
|
|
%3 = getelementptr %CC* %0, i32 -9 ; <%CC*> [#uses=1]
|
|
|
|
|
%4 = bitcast %CC* %3 to %YYValue** ; <%YYValue**> [#uses=2]
|
|
|
|
|
%5 = load %YYValue** %4 ; <%YYValue*> [#uses=3]
|
|
|
|
|
%unique_1.i = ptrtoint %YYValue* %5 to i1 ; <i1> [#uses=1]
|
|
|
|
|
br i1 %unique_1.i, label %loop, label %11
|
|
|
|
|
|
|
|
|
|
loop: ; preds = %6, %2
|
|
|
|
|
%.1 = phi %YYValue* [ inttoptr (i32 1 to %YYValue*), %2 ], [ %intAddValue, %6 ] ; <%YYValue*> [#uses=3]
|
|
|
|
|
%immediateCmp = icmp slt %YYValue* %.1, %5 ; <i1> [#uses=1]
|
|
|
|
|
br i1 %immediateCmp, label %6, label %8
|
|
|
|
|
|
|
|
|
|
; <label>:6 ; preds = %loop
|
|
|
|
|
%lhsInt = ptrtoint %YYValue* %.1 to i32 ; <i32> [#uses=1]
|
|
|
|
|
%7 = call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 %lhsInt, i32 2) ; <{ i32, i1 }> [#uses=2]
|
|
|
|
|
%intAdd = extractvalue { i32, i1 } %7, 0 ; <i32> [#uses=1]
|
|
|
|
|
%intAddValue = inttoptr i32 %intAdd to %YYValue* ; <%YYValue*> [#uses=1]
|
|
|
|
|
%intAddOverflow = extractvalue { i32, i1 } %7, 1 ; <i1> [#uses=1]
|
|
|
|
|
br i1 %intAddOverflow, label %.loopexit, label %loop
|
|
|
|
|
|
|
|
|
|
; <label>:8 ; preds = %loop
|
|
|
|
|
ret %YYValue* inttoptr (i32 10 to %YYValue*)
|
|
|
|
|
|
|
|
|
|
.loopexit: ; preds = %6
|
|
|
|
|
%9 = bitcast %CC* %0 to %YYValue** ; <%YYValue**> [#uses=1]
|
|
|
|
|
store %YYValue* %.1, %YYValue** %9
|
|
|
|
|
store %YYValue* %5, %YYValue** %4
|
|
|
|
|
%10 = call fastcc %YYValue* @foobar(%II* inttoptr (i32 3431104 to %II*), %CC* %0, %YYValue** %1) ; <%YYValue*> [#uses=1]
|
|
|
|
|
ret %YYValue* %10
|
|
|
|
|
|
|
|
|
|
; <label>:11 ; preds = %2
|
|
|
|
|
%12 = call fastcc %YYValue* @foobar(%II* inttoptr (i32 3431080 to %II*), %CC* %0, %YYValue** %1) ; <%YYValue*> [#uses=1]
|
|
|
|
|
ret %YYValue* %12
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
declare fastcc %YYValue* @foobar(%II*, %CC*, %YYValue**) nounwind
|
|
|
|
|
|
|
|
|
|
declare { i32, i1 } @llvm.sadd.with.overflow.i32(i32, i32) nounwind
|
