1 ; RUN: opt -S < %s -instcombine | FileCheck %s 2 3 target datalayout = "e-p1:16:16-p2:32:32-p3:64:64" 4 5 @G1 = global i32 42, align 1 6 @G2 = global i32 42 7 @G3 = global [4 x i8] zeroinitializer, align 1 8 9 @A1 = alias bitcast (i8* getelementptr inbounds ([4 x i8], [4 x i8]* @G3, i32 0, i32 2) to i32*) 10 @A2 = alias inttoptr (i64 and (i64 ptrtoint (i8* getelementptr inbounds ([4 x i8], [4 x i8]* @G3, i32 0, i32 3) to i64), i64 -4) to i32*) 11 12 define i64 @f1() { 13 ; This cannot be constant folded because G1 is underaligned. 14 ; CHECK-LABEL: @f1( 15 ; CHECK: ret i64 and 16 ret i64 and (i64 ptrtoint (i32* @G1 to i64), i64 1) 17 } 18 19 define i64 @f2() { 20 ; The preferred alignment for G2 allows this one to foled to zero. 21 ; CHECK-LABEL: @f2( 22 ; CHECK: ret i64 0 23 ret i64 and (i64 ptrtoint (i32* @G2 to i64), i64 1) 24 } 25 26 define i64 @g1() { 27 ; This cannot be constant folded because A1 aliases G3 which is underalaigned. 28 ; CHECK-LABEL: @g1( 29 ; CHECK: ret i64 and 30 ret i64 and (i64 ptrtoint (i32* @A1 to i64), i64 1) 31 } 32 33 define i64 @g2() { 34 ; While A2 also aliases G3 which is underaligned, the math of A2 forces a 35 ; certain alignment allowing this to fold to zero. 36 ; CHECK-LABEL: @g2( 37 ; CHECK: ret i64 0 38 ret i64 and (i64 ptrtoint (i32* @A2 to i64), i64 1) 39 } 40 41
