1 ; RUN: opt < %s -constprop -S | FileCheck %s 2 3 ; Overflow on a float to int or int to float conversion is undefined (PR21130). 4 5 define i8 @overflow_fptosi() { 6 ; CHECK-LABEL: @overflow_fptosi( 7 ; CHECK-NEXT: ret i8 undef 8 ; 9 %i = fptosi double 1.56e+02 to i8 10 ret i8 %i 11 } 12 13 define i8 @overflow_fptoui() { 14 ; CHECK-LABEL: @overflow_fptoui( 15 ; CHECK-NEXT: ret i8 undef 16 ; 17 %i = fptoui double 2.56e+02 to i8 18 ret i8 %i 19 } 20 21 ; The maximum float is approximately 2 ** 128 which is 3.4E38. 22 ; The constant below is 4E38. Use a 130 bit integer to hold that 23 ; number; 129-bits for the value + 1 bit for the sign. 24 25 define float @overflow_uitofp() { 26 ; CHECK-LABEL: @overflow_uitofp( 27 ; CHECK-NEXT: ret float 0x7FF0000000000000 28 ; 29 %i = uitofp i130 400000000000000000000000000000000000000 to float 30 ret float %i 31 } 32 33 define float @overflow_sitofp() { 34 ; CHECK-LABEL: @overflow_sitofp( 35 ; CHECK-NEXT: ret float 0x7FF0000000000000 36 ; 37 %i = sitofp i130 400000000000000000000000000000000000000 to float 38 ret float %i 39 } 40 41
