1 ; RUN: opt -S -instcombine < %s | FileCheck %s 2 3 ; rdar://12182093 4 5 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-n8:16:32:64-S128" 6 target triple = "x86_64-apple-macosx10.8.0" 7 8 ; CHECK: @udiv400 9 ; CHECK: udiv i32 %x, 400 10 ; CHECK: ret 11 define i32 @udiv400(i32 %x) { 12 entry: 13 %div = lshr i32 %x, 2 14 %div1 = udiv i32 %div, 100 15 ret i32 %div1 16 } 17 18 19 ; CHECK: @udiv400_no 20 ; CHECK: ashr 21 ; CHECK: div 22 ; CHECK: ret 23 define i32 @udiv400_no(i32 %x) { 24 entry: 25 %div = ashr i32 %x, 2 26 %div1 = udiv i32 %div, 100 27 ret i32 %div1 28 } 29 30 ; CHECK: @sdiv400_yes 31 ; CHECK: udiv i32 %x, 400 32 ; CHECK: ret 33 define i32 @sdiv400_yes(i32 %x) { 34 entry: 35 %div = lshr i32 %x, 2 36 ; The sign bits of both operands are zero (i.e. we can prove they are 37 ; unsigned inputs), turn this into a udiv. 38 ; Next, optimize this just like sdiv. 39 %div1 = sdiv i32 %div, 100 40 ret i32 %div1 41 } 42 43 44 ; CHECK: @udiv_i80 45 ; CHECK: udiv i80 %x, 400 46 ; CHECK: ret 47 define i80 @udiv_i80(i80 %x) { 48 %div = lshr i80 %x, 2 49 %div1 = udiv i80 %div, 100 50 ret i80 %div1 51 } 52 53 define i32 @no_crash_notconst_udiv(i32 %x, i32 %notconst) { 54 %div = lshr i32 %x, %notconst 55 %div1 = udiv i32 %div, 100 56 ret i32 %div1 57 } 58
