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[KnownBits] Add tests for getting lowbits of
rem X, Y; NFC
Reviewed By: foad Differential Revision: https://reviews.llvm.org/D149420
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llvm/test/Analysis/ValueTracking/knownbits-rem-lowbits.ll
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,154 @@ | ||
| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py | ||
| ; RUN: opt < %s -passes=instcombine -S | FileCheck %s | ||
|
|
||
| define i8 @urem_low_bits_know(i8 %xx, i8 %yy) { | ||
| ; CHECK-LABEL: @urem_low_bits_know( | ||
| ; CHECK-NEXT: [[X:%.*]] = or i8 [[XX:%.*]], 2 | ||
| ; CHECK-NEXT: [[Y:%.*]] = and i8 [[YY:%.*]], -4 | ||
| ; CHECK-NEXT: [[REM:%.*]] = urem i8 [[X]], [[Y]] | ||
| ; CHECK-NEXT: [[R:%.*]] = and i8 [[REM]], 2 | ||
| ; CHECK-NEXT: ret i8 [[R]] | ||
| ; | ||
| %x = or i8 %xx, 2 | ||
| %y = and i8 %yy, -4 | ||
| %rem = urem i8 %x, %y | ||
| %r = and i8 %rem, 2 | ||
| ret i8 %r | ||
| } | ||
|
|
||
| define i8 @urem_low_bits_know2(i8 %xx, i8 %yy) { | ||
| ; CHECK-LABEL: @urem_low_bits_know2( | ||
| ; CHECK-NEXT: [[XO:%.*]] = and i8 [[XX:%.*]], -4 | ||
| ; CHECK-NEXT: [[X:%.*]] = or i8 [[XO]], 2 | ||
| ; CHECK-NEXT: [[Y:%.*]] = and i8 [[YY:%.*]], -4 | ||
| ; CHECK-NEXT: [[REM:%.*]] = urem i8 [[X]], [[Y]] | ||
| ; CHECK-NEXT: [[R:%.*]] = and i8 [[REM]], 3 | ||
| ; CHECK-NEXT: ret i8 [[R]] | ||
| ; | ||
| %xo = or i8 %xx, 2 | ||
| %x = and i8 %xo, 254 | ||
| %y = and i8 %yy, -4 | ||
| %rem = urem i8 %x, %y | ||
| %r = and i8 %rem, 3 | ||
| ret i8 %r | ||
| } | ||
|
|
||
| define i8 @urem_todo_low_bits_partially_know_should_fold_out_urem(i8 %xx, i8 %yy) { | ||
| ; CHECK-LABEL: @urem_todo_low_bits_partially_know_should_fold_out_urem( | ||
| ; CHECK-NEXT: [[X:%.*]] = or i8 [[XX:%.*]], 2 | ||
| ; CHECK-NEXT: [[Y:%.*]] = and i8 [[YY:%.*]], -4 | ||
| ; CHECK-NEXT: [[REM:%.*]] = urem i8 [[X]], [[Y]] | ||
| ; CHECK-NEXT: [[R:%.*]] = and i8 [[REM]], 3 | ||
| ; CHECK-NEXT: ret i8 [[R]] | ||
| ; | ||
| %x = or i8 %xx, 2 | ||
| %y = and i8 %yy, -4 | ||
| %rem = urem i8 %x, %y | ||
| %r = and i8 %rem, 3 | ||
| ret i8 %r | ||
| } | ||
|
|
||
| define i8 @urem_fail_low_bits_unknown(i8 %xx, i8 %yy) { | ||
| ; CHECK-LABEL: @urem_fail_low_bits_unknown( | ||
| ; CHECK-NEXT: [[X:%.*]] = or i8 [[XX:%.*]], 4 | ||
| ; CHECK-NEXT: [[Y:%.*]] = and i8 [[YY:%.*]], -4 | ||
| ; CHECK-NEXT: [[REM:%.*]] = urem i8 [[X]], [[Y]] | ||
| ; CHECK-NEXT: [[R:%.*]] = and i8 [[REM]], 2 | ||
| ; CHECK-NEXT: ret i8 [[R]] | ||
| ; | ||
| %x = or i8 %xx, 4 | ||
| %y = and i8 %yy, -4 | ||
| %rem = urem i8 %x, %y | ||
| %r = and i8 %rem, 2 | ||
| ret i8 %r | ||
| } | ||
|
|
||
| define i8 @urem_fail_low_bits_unknown2(i8 %xx, i8 %yy) { | ||
| ; CHECK-LABEL: @urem_fail_low_bits_unknown2( | ||
| ; CHECK-NEXT: [[X:%.*]] = or i8 [[XX:%.*]], 1 | ||
| ; CHECK-NEXT: [[Y:%.*]] = and i8 [[YY:%.*]], -5 | ||
| ; CHECK-NEXT: [[REM:%.*]] = urem i8 [[X]], [[Y]] | ||
| ; CHECK-NEXT: [[R:%.*]] = and i8 [[REM]], 2 | ||
| ; CHECK-NEXT: ret i8 [[R]] | ||
| ; | ||
| %x = or i8 %xx, 1 | ||
| %y = and i8 %yy, -5 | ||
| %rem = urem i8 %x, %y | ||
| %r = and i8 %rem, 2 | ||
| ret i8 %r | ||
| } | ||
|
|
||
| define i8 @srem_low_bits_know(i8 %xx, i8 %yy) { | ||
| ; CHECK-LABEL: @srem_low_bits_know( | ||
| ; CHECK-NEXT: [[X:%.*]] = or i8 [[XX:%.*]], 10 | ||
| ; CHECK-NEXT: [[Y:%.*]] = and i8 [[YY:%.*]], -4 | ||
| ; CHECK-NEXT: [[REM:%.*]] = srem i8 [[X]], [[Y]] | ||
| ; CHECK-NEXT: [[R:%.*]] = and i8 [[REM]], 2 | ||
| ; CHECK-NEXT: ret i8 [[R]] | ||
| ; | ||
| %x = or i8 %xx, 10 | ||
| %y = and i8 %yy, -4 | ||
| %rem = srem i8 %x, %y | ||
| %r = and i8 %rem, 2 | ||
| ret i8 %r | ||
| } | ||
|
|
||
| define i8 @srem_low_bits_know2(i8 %xx, i8 %yy) { | ||
| ; CHECK-LABEL: @srem_low_bits_know2( | ||
| ; CHECK-NEXT: [[X:%.*]] = or i8 [[XX:%.*]], 1 | ||
| ; CHECK-NEXT: [[Y:%.*]] = and i8 [[YY:%.*]], -2 | ||
| ; CHECK-NEXT: [[REM:%.*]] = srem i8 [[X]], [[Y]] | ||
| ; CHECK-NEXT: [[R:%.*]] = and i8 [[REM]], 1 | ||
| ; CHECK-NEXT: ret i8 [[R]] | ||
| ; | ||
| %x = or i8 %xx, 1 | ||
| %y = and i8 %yy, -2 | ||
| %rem = srem i8 %x, %y | ||
| %r = and i8 %rem, 1 | ||
| ret i8 %r | ||
| } | ||
|
|
||
| define i8 @srem_todo_low_bits_partially_know_should_fold_out_srem(i8 %xx, i8 %yy) { | ||
| ; CHECK-LABEL: @srem_todo_low_bits_partially_know_should_fold_out_srem( | ||
| ; CHECK-NEXT: [[X:%.*]] = or i8 [[XX:%.*]], 10 | ||
| ; CHECK-NEXT: [[Y:%.*]] = and i8 [[YY:%.*]], -4 | ||
| ; CHECK-NEXT: [[REM:%.*]] = srem i8 [[X]], [[Y]] | ||
| ; CHECK-NEXT: [[R:%.*]] = and i8 [[REM]], 3 | ||
| ; CHECK-NEXT: ret i8 [[R]] | ||
| ; | ||
| %x = or i8 %xx, 10 | ||
| %y = and i8 %yy, -4 | ||
| %rem = srem i8 %x, %y | ||
| %r = and i8 %rem, 3 | ||
| ret i8 %r | ||
| } | ||
|
|
||
| define i8 @srem_fail_low_bits_unknown(i8 %xx, i8 %yy) { | ||
| ; CHECK-LABEL: @srem_fail_low_bits_unknown( | ||
| ; CHECK-NEXT: [[X:%.*]] = or i8 [[XX:%.*]], 4 | ||
| ; CHECK-NEXT: [[Y:%.*]] = and i8 [[YY:%.*]], -4 | ||
| ; CHECK-NEXT: [[REM:%.*]] = srem i8 [[X]], [[Y]] | ||
| ; CHECK-NEXT: [[R:%.*]] = and i8 [[REM]], 2 | ||
| ; CHECK-NEXT: ret i8 [[R]] | ||
| ; | ||
| %x = or i8 %xx, 4 | ||
| %y = and i8 %yy, -4 | ||
| %rem = srem i8 %x, %y | ||
| %r = and i8 %rem, 2 | ||
| ret i8 %r | ||
| } | ||
|
|
||
| define i8 @srem_fail_irrelivent_bits_known(i8 %xx, i8 %yy) { | ||
| ; CHECK-LABEL: @srem_fail_irrelivent_bits_known( | ||
| ; CHECK-NEXT: [[X:%.*]] = or i8 [[XX:%.*]], 3 | ||
| ; CHECK-NEXT: [[Y:%.*]] = and i8 [[YY:%.*]], -6 | ||
| ; CHECK-NEXT: [[REM:%.*]] = srem i8 [[X]], [[Y]] | ||
| ; CHECK-NEXT: [[R:%.*]] = and i8 [[REM]], 2 | ||
| ; CHECK-NEXT: ret i8 [[R]] | ||
| ; | ||
| %x = or i8 %xx, 3 | ||
| %y = and i8 %yy, -6 | ||
| %rem = srem i8 %x, %y | ||
| %r = and i8 %rem, 2 | ||
| ret i8 %r | ||
| } |