1
0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-04-09 01:38:03 +00:00

Disable the transformation I added in r147936 to see if it fixes some

strange build bot failures that look like a miscompile into an infloop.
I'll investigate this tomorrow, but I'd both like to know whether my
patch is the culprit, and get the bots back to green.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147945 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chandler Carruth 2012-01-11 12:17:47 +00:00
parent d65a9106cd
commit e4bc80a14b
2 changed files with 14 additions and 10 deletions
lib/Target/X86
test/CodeGen/X86

@ -847,6 +847,10 @@ static bool FoldMaskAndShiftToScale(SelectionDAG &DAG, SDValue N,
uint64_t Mask,
SDValue Shift, SDValue X,
X86ISelAddressMode &AM) {
// FIXME!! Hack to disable this and see if it is responsible for a miscompile
// on llvm-gcc's selfhost.
return true;
if (Shift.getOpcode() != ISD::SRL || !Shift.hasOneUse() ||
!isa<ConstantSDNode>(Shift.getOperand(1)))
return true;

@ -39,11 +39,11 @@ define i32 @t3(i16* %i.ptr, i32* %arr) {
; To make matters worse, because of the two-phase zext of %i and their reuse in
; the function, the DAG can get confusing trying to re-use both of them and
; prevent easy analysis of the mask in order to match this.
; CHECK: t3:
; CHECK-NOT: and
; CHECK: shrl
; CHECK: addl (%{{...}},%{{...}},4),
; CHECK: ret
; BROKEN: t3:
; BROKEN-NOT: and
; BROKEN: shrl
; BROKEN: addl (%{{...}},%{{...}},4),
; BROKEN: ret
entry:
%i = load i16* %i.ptr
@ -58,11 +58,11 @@ entry:
define i32 @t4(i16* %i.ptr, i32* %arr) {
; A version of @t3 that has more zero extends and more re-use of intermediate
; values. This exercise slightly different bits of canonicalization.
; CHECK: t4:
; CHECK-NOT: and
; CHECK: shrl
; CHECK: addl (%{{...}},%{{...}},4),
; CHECK: ret
; BROKEN: t4:
; BROKEN-NOT: and
; BROKEN: shrl
; BROKEN: addl (%{{...}},%{{...}},4),
; BROKEN: ret
entry:
%i = load i16* %i.ptr