| ; RUN: opt < %s -S -passes=instcombine | FileCheck %s |
| ; Note: This is testing functionality in computeKnownBits. I'd have rather |
| ; used instsimplify, but the bit test folding is apparently only in instcombine. |
| |
| declare i16 @llvm.bswap.i16(i16) |
| declare i32 @llvm.bswap.i32(i32) |
| |
| define i1 @test1(i16 %arg) { |
| ; CHECK-LABEL: @test1 |
| ; CHECK: ret i1 true |
| %a = or i16 %arg, 511 |
| %b = call i16 @llvm.bswap.i16(i16 %a) |
| %and = and i16 %b, 256 |
| %res = icmp eq i16 %and, 256 |
| ret i1 %res |
| } |
| |
| define i1 @test2(i16 %arg) { |
| ; CHECK-LABEL: @test2 |
| ; CHECK: ret i1 true |
| %a = or i16 %arg, 1 |
| %b = call i16 @llvm.bswap.i16(i16 %a) |
| %and = and i16 %b, 256 |
| %res = icmp eq i16 %and, 256 |
| ret i1 %res |
| } |
| |
| |
| define i1 @test3(i16 %arg) { |
| ; CHECK-LABEL: @test3 |
| ; CHECK: ret i1 true |
| %a = or i16 %arg, 256 |
| %b = call i16 @llvm.bswap.i16(i16 %a) |
| %and = and i16 %b, 1 |
| %res = icmp eq i16 %and, 1 |
| ret i1 %res |
| } |
| |
| define i1 @test4(i32 %arg) { |
| ; CHECK-LABEL: @test4 |
| ; CHECK: ret i1 true |
| %a = or i32 %arg, 2147483647 ; i32_MAX |
| %b = call i32 @llvm.bswap.i32(i32 %a) |
| %and = and i32 %b, 127 |
| %res = icmp eq i32 %and, 127 |
| ret i1 %res |
| } |