| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py |
| ; RUN: opt -S -instcombine < %s | FileCheck %s |
| |
| define i16 @foo(i16 %x) { |
| ; CHECK-LABEL: @foo( |
| ; CHECK-NEXT: [[T1:%.*]] = and i16 [[X:%.*]], 255 |
| ; CHECK-NEXT: ret i16 [[T1]] |
| ; |
| %t1 = and i16 %x, 255 |
| %t2 = zext i16 %t1 to i32 |
| %t3 = icmp ult i32 %t2, 255 |
| %t4 = select i1 %t3, i32 %t2, i32 255 |
| %t5 = trunc i32 %t4 to i16 |
| %t6 = and i16 %t5, 255 |
| ret i16 %t6 |
| } |
| |
| ; This contains a min/max pair to clamp a value to 12 bits. |
| ; By analyzing the clamp pattern, we can tell the add doesn't have signed overflow. |
| define i16 @min_max_clamp(i16 %x) { |
| ; CHECK-LABEL: @min_max_clamp( |
| ; CHECK-NEXT: [[A:%.*]] = icmp sgt i16 [[X:%.*]], -2048 |
| ; CHECK-NEXT: [[B:%.*]] = select i1 [[A]], i16 [[X]], i16 -2048 |
| ; CHECK-NEXT: [[C:%.*]] = icmp slt i16 [[B]], 2047 |
| ; CHECK-NEXT: [[D:%.*]] = select i1 [[C]], i16 [[B]], i16 2047 |
| ; CHECK-NEXT: [[E:%.*]] = add nsw i16 [[D]], 1 |
| ; CHECK-NEXT: ret i16 [[E]] |
| ; |
| %a = icmp sgt i16 %x, -2048 |
| %b = select i1 %a, i16 %x, i16 -2048 |
| %c = icmp slt i16 %b, 2047 |
| %d = select i1 %c, i16 %b, i16 2047 |
| %e = add i16 %d, 1 |
| ret i16 %e |
| } |
| |
| ; Same as above with min/max reversed. |
| define i16 @min_max_clamp_2(i16 %x) { |
| ; CHECK-LABEL: @min_max_clamp_2( |
| ; CHECK-NEXT: [[A:%.*]] = icmp slt i16 [[X:%.*]], 2047 |
| ; CHECK-NEXT: [[B:%.*]] = select i1 [[A]], i16 [[X]], i16 2047 |
| ; CHECK-NEXT: [[C:%.*]] = icmp sgt i16 [[B]], -2048 |
| ; CHECK-NEXT: [[D:%.*]] = select i1 [[C]], i16 [[B]], i16 -2048 |
| ; CHECK-NEXT: [[E:%.*]] = add nsw i16 [[D]], 1 |
| ; CHECK-NEXT: ret i16 [[E]] |
| ; |
| %a = icmp slt i16 %x, 2047 |
| %b = select i1 %a, i16 %x, i16 2047 |
| %c = icmp sgt i16 %b, -2048 |
| %d = select i1 %c, i16 %b, i16 -2048 |
| %e = add i16 %d, 1 |
| ret i16 %e |
| } |
| |
| ; This contains a min/max pair to clamp a value to 12 bits. |
| ; By analyzing the clamp pattern, we can tell that the second add doesn't |
| ; overflow the original type and can be moved before the extend. |
| define i32 @min_max_clamp_3(i16 %x) { |
| ; CHECK-LABEL: @min_max_clamp_3( |
| ; CHECK-NEXT: [[A:%.*]] = icmp sgt i16 [[X:%.*]], -2048 |
| ; CHECK-NEXT: [[B:%.*]] = select i1 [[A]], i16 [[X]], i16 -2048 |
| ; CHECK-NEXT: [[C:%.*]] = icmp slt i16 [[B]], 2047 |
| ; CHECK-NEXT: [[D:%.*]] = select i1 [[C]], i16 [[B]], i16 2047 |
| ; CHECK-NEXT: [[G:%.*]] = sext i16 [[D]] to i32 |
| ; CHECK-NEXT: ret i32 [[G]] |
| ; |
| %a = icmp sgt i16 %x, -2048 |
| %b = select i1 %a, i16 %x, i16 -2048 |
| %c = icmp slt i16 %b, 2047 |
| %d = select i1 %c, i16 %b, i16 2047 |
| %e = add i16 %d, 1 |
| %f = sext i16 %e to i32 |
| %g = add i32 %f, -1 |
| ret i32 %g |
| } |
| |
| ; Same as above with min/max order reversed |
| define i32 @min_max_clamp_4(i16 %x) { |
| ; CHECK-LABEL: @min_max_clamp_4( |
| ; CHECK-NEXT: [[A:%.*]] = icmp slt i16 [[X:%.*]], 2047 |
| ; CHECK-NEXT: [[B:%.*]] = select i1 [[A]], i16 [[X]], i16 2047 |
| ; CHECK-NEXT: [[C:%.*]] = icmp sgt i16 [[B]], -2048 |
| ; CHECK-NEXT: [[D:%.*]] = select i1 [[C]], i16 [[B]], i16 -2048 |
| ; CHECK-NEXT: [[G:%.*]] = sext i16 [[D]] to i32 |
| ; CHECK-NEXT: ret i32 [[G]] |
| ; |
| %a = icmp slt i16 %x, 2047 |
| %b = select i1 %a, i16 %x, i16 2047 |
| %c = icmp sgt i16 %b, -2048 |
| %d = select i1 %c, i16 %b, i16 -2048 |
| %e = add i16 %d, 1 |
| %f = sext i16 %e to i32 |
| %g = add i32 %f, -1 |
| ret i32 %g |
| } |