| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py |
| ; RUN: opt < %s -instcombine -S | FileCheck %s |
| |
| ; Remove an icmp by using its operand in the subsequent logic directly. |
| |
| define i8 @zext_or_icmp_icmp(i8 %a, i8 %b) { |
| ; CHECK-LABEL: @zext_or_icmp_icmp( |
| ; CHECK-NEXT: [[MASK:%.*]] = and i8 [[A:%.*]], 1 |
| ; CHECK-NEXT: [[TOBOOL2:%.*]] = icmp eq i8 [[B:%.*]], 0 |
| ; CHECK-NEXT: [[TOBOOL22:%.*]] = zext i1 [[TOBOOL2]] to i8 |
| ; CHECK-NEXT: [[TMP1:%.*]] = xor i8 [[MASK]], 1 |
| ; CHECK-NEXT: [[ZEXT3:%.*]] = or i8 [[TMP1]], [[TOBOOL22]] |
| ; CHECK-NEXT: ret i8 [[ZEXT3]] |
| ; |
| %mask = and i8 %a, 1 |
| %toBool1 = icmp eq i8 %mask, 0 |
| %toBool2 = icmp eq i8 %b, 0 |
| %bothCond = or i1 %toBool1, %toBool2 |
| %zext = zext i1 %bothCond to i8 |
| ret i8 %zext |
| } |
| |
| define i8 @zext_or_icmp_icmp_logical(i8 %a, i8 %b) { |
| ; CHECK-LABEL: @zext_or_icmp_icmp_logical( |
| ; CHECK-NEXT: [[MASK:%.*]] = and i8 [[A:%.*]], 1 |
| ; CHECK-NEXT: [[TOBOOL2:%.*]] = icmp eq i8 [[B:%.*]], 0 |
| ; CHECK-NEXT: [[TOBOOL22:%.*]] = zext i1 [[TOBOOL2]] to i8 |
| ; CHECK-NEXT: [[TMP1:%.*]] = xor i8 [[MASK]], 1 |
| ; CHECK-NEXT: [[ZEXT3:%.*]] = or i8 [[TMP1]], [[TOBOOL22]] |
| ; CHECK-NEXT: ret i8 [[ZEXT3]] |
| ; |
| %mask = and i8 %a, 1 |
| %toBool1 = icmp eq i8 %mask, 0 |
| %toBool2 = icmp eq i8 %b, 0 |
| %bothCond = select i1 %toBool1, i1 true, i1 %toBool2 |
| %zext = zext i1 %bothCond to i8 |
| ret i8 %zext |
| } |
| |
| ; Here, widening the or from i1 to i32 and removing one of the icmps would |
| ; widen an undef value (created by the out-of-range shift), increasing the |
| ; range of valid values for the return, so we can't do it. |
| |
| define i32 @dont_widen_undef() { |
| ; CHECK-LABEL: @dont_widen_undef( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: br label [[BLOCK2:%.*]] |
| ; CHECK: block1: |
| ; CHECK-NEXT: br label [[BLOCK2]] |
| ; CHECK: block2: |
| ; CHECK-NEXT: [[CMP_I:%.*]] = phi i1 [ false, [[BLOCK1:%.*]] ], [ true, [[ENTRY:%.*]] ] |
| ; CHECK-NEXT: [[CMP115:%.*]] = phi i1 [ true, [[BLOCK1]] ], [ false, [[ENTRY]] ] |
| ; CHECK-NEXT: [[CMP1:%.*]] = or i1 [[CMP_I]], [[CMP115]] |
| ; CHECK-NEXT: [[CONV2:%.*]] = zext i1 [[CMP1]] to i32 |
| ; CHECK-NEXT: ret i32 [[CONV2]] |
| ; |
| entry: |
| br label %block2 |
| |
| block1: |
| br label %block2 |
| |
| block2: |
| %m.011 = phi i32 [ 33, %entry ], [ 0, %block1 ] |
| %cmp.i = icmp ugt i32 %m.011, 1 |
| %m.1.op = lshr i32 1, %m.011 |
| %sext.mask = and i32 %m.1.op, 65535 |
| %cmp115 = icmp ne i32 %sext.mask, 0 |
| %cmp1 = or i1 %cmp.i, %cmp115 |
| %conv2 = zext i1 %cmp1 to i32 |
| ret i32 %conv2 |
| } |
| |
| define i32 @dont_widen_undef_logical() { |
| ; CHECK-LABEL: @dont_widen_undef_logical( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: br label [[BLOCK2:%.*]] |
| ; CHECK: block1: |
| ; CHECK-NEXT: br label [[BLOCK2]] |
| ; CHECK: block2: |
| ; CHECK-NEXT: [[CMP_I:%.*]] = phi i1 [ false, [[BLOCK1:%.*]] ], [ true, [[ENTRY:%.*]] ] |
| ; CHECK-NEXT: [[CMP115:%.*]] = phi i1 [ true, [[BLOCK1]] ], [ false, [[ENTRY]] ] |
| ; CHECK-NEXT: [[CMP1:%.*]] = or i1 [[CMP_I]], [[CMP115]] |
| ; CHECK-NEXT: [[CONV2:%.*]] = zext i1 [[CMP1]] to i32 |
| ; CHECK-NEXT: ret i32 [[CONV2]] |
| ; |
| entry: |
| br label %block2 |
| |
| block1: |
| br label %block2 |
| |
| block2: |
| %m.011 = phi i32 [ 33, %entry ], [ 0, %block1 ] |
| %cmp.i = icmp ugt i32 %m.011, 1 |
| %m.1.op = lshr i32 1, %m.011 |
| %sext.mask = and i32 %m.1.op, 65535 |
| %cmp115 = icmp ne i32 %sext.mask, 0 |
| %cmp1 = select i1 %cmp.i, i1 true, i1 %cmp115 |
| %conv2 = zext i1 %cmp1 to i32 |
| ret i32 %conv2 |
| } |