1 ; This tests for various complex cast elimination cases instcombine should 2 ; handle. 3 4 target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128" 5 6 ; RUN: opt < %s -instcombine -S | FileCheck %s 7 8 define i1 @test1(i32 %X) { 9 %A = bitcast i32 %X to i32 ; <i32> [#uses=1] 10 ; Convert to setne int %X, 12 11 %c = icmp ne i32 %A, 12 ; <i1> [#uses=1] 12 ret i1 %c 13 ; CHECK: %c = icmp ne i32 %X, 12 14 ; CHECK: ret i1 %c 15 } 16 17 define i1 @test2(i32 %X, i32 %Y) { 18 %A = bitcast i32 %X to i32 ; <i32> [#uses=1] 19 %B = bitcast i32 %Y to i32 ; <i32> [#uses=1] 20 ; Convert to setne int %X, %Y 21 %c = icmp ne i32 %A, %B ; <i1> [#uses=1] 22 ret i1 %c 23 ; CHECK: %c = icmp ne i32 %X, %Y 24 ; CHECK: ret i1 %c 25 } 26 27 define i32 @test4(i32 %A) { 28 %B = bitcast i32 %A to i32 ; <i32> [#uses=1] 29 %C = shl i32 %B, 2 ; <i32> [#uses=1] 30 %D = bitcast i32 %C to i32 ; <i32> [#uses=1] 31 ret i32 %D 32 ; CHECK: %C = shl i32 %A, 2 33 ; CHECK: ret i32 %C 34 } 35 36 define i16 @test5(i16 %A) { 37 %B = sext i16 %A to i32 ; <i32> [#uses=1] 38 %C = and i32 %B, 15 ; <i32> [#uses=1] 39 %D = trunc i32 %C to i16 ; <i16> [#uses=1] 40 ret i16 %D 41 ; CHECK: %C = and i16 %A, 15 42 ; CHECK: ret i16 %C 43 } 44 45 define i1 @test6(i1 %A) { 46 %B = zext i1 %A to i32 ; <i32> [#uses=1] 47 %C = icmp ne i32 %B, 0 ; <i1> [#uses=1] 48 ret i1 %C 49 ; CHECK: ret i1 %A 50 } 51 52 define i1 @test6a(i1 %A) { 53 %B = zext i1 %A to i32 ; <i32> [#uses=1] 54 %C = icmp ne i32 %B, -1 ; <i1> [#uses=1] 55 ret i1 %C 56 ; CHECK: ret i1 true 57 } 58 59 define i1 @test7(i8* %A) { 60 %B = bitcast i8* %A to i32* ; <i32*> [#uses=1] 61 %C = icmp eq i32* %B, null ; <i1> [#uses=1] 62 ret i1 %C 63 ; CHECK: %C = icmp eq i8* %A, null 64 ; CHECK: ret i1 %C 65 } 66
