2009-09-09 01:54:48 +02:00
|
|
|
; RUN: llc < %s -march=x86
|
Fix a dagga combiner bug: avoid creating illegal constant.
Is this really a winning transformation?
fold (shl (srl x, c1), c2) -> (shl (and x, (shl -1, c1)), (sub c2, c1)) or
(srl (and x, (shl -1, c1)), (sub c1, c2))
llvm-svn: 76535
2009-07-21 07:40:15 +02:00
|
|
|
|
|
|
|
|
@bsBuff = internal global i32 0 ; <i32*> [#uses=1]
|
|
|
|
|
@llvm.used = appending global [1 x i8*] [i8* bitcast (i32 ()* @bsGetUInt32 to i8*)], section "llvm.metadata" ; <[1 x i8*]*> [#uses=0]
|
|
|
|
|
|
|
|
|
|
define fastcc i32 @bsGetUInt32() nounwind ssp {
|
|
|
|
|
entry:
|
|
|
|
|
%bsBuff.promoted44 = load i32* @bsBuff ; <i32> [#uses=1]
|
|
|
|
|
%0 = add i32 0, -8 ; <i32> [#uses=1]
|
|
|
|
|
%1 = lshr i32 %bsBuff.promoted44, %0 ; <i32> [#uses=1]
|
|
|
|
|
%2 = shl i32 %1, 8 ; <i32> [#uses=1]
|
|
|
|
|
br label %bb3.i17
|
|
|
|
|
|
|
|
|
|
bb3.i9: ; preds = %bb3.i17
|
|
|
|
|
br i1 false, label %bb2.i16, label %bb1.i15
|
|
|
|
|
|
|
|
|
|
bb1.i15: ; preds = %bb3.i9
|
|
|
|
|
unreachable
|
|
|
|
|
|
|
|
|
|
bb2.i16: ; preds = %bb3.i9
|
|
|
|
|
br label %bb3.i17
|
|
|
|
|
|
|
|
|
|
bb3.i17: ; preds = %bb2.i16, %entry
|
|
|
|
|
br i1 false, label %bb3.i9, label %bsR.exit18
|
|
|
|
|
|
|
|
|
|
bsR.exit18: ; preds = %bb3.i17
|
|
|
|
|
%3 = or i32 0, %2 ; <i32> [#uses=0]
|
|
|
|
|
ret i32 0
|
|
|
|
|
}
|
