| ; RUN: opt < %s -constprop -S | FileCheck %s |
| |
| ; Overflow on a float to int or int to float conversion is undefined (PR21130). |
| |
| define i8 @overflow_fptosi() { |
| ; CHECK-LABEL: @overflow_fptosi( |
| ; CHECK-NEXT: ret i8 undef |
| ; |
| %i = fptosi double 1.56e+02 to i8 |
| ret i8 %i |
| } |
| |
| define i8 @overflow_fptoui() { |
| ; CHECK-LABEL: @overflow_fptoui( |
| ; CHECK-NEXT: ret i8 undef |
| ; |
| %i = fptoui double 2.56e+02 to i8 |
| ret i8 %i |
| } |
| |
| ; The maximum float is approximately 2 ** 128 which is 3.4E38. |
| ; The constant below is 4E38. Use a 130 bit integer to hold that |
| ; number; 129-bits for the value + 1 bit for the sign. |
| |
| define float @overflow_uitofp() { |
| ; CHECK-LABEL: @overflow_uitofp( |
| ; CHECK-NEXT: ret float 0x7FF0000000000000 |
| ; |
| %i = uitofp i130 400000000000000000000000000000000000000 to float |
| ret float %i |
| } |
| |
| define float @overflow_sitofp() { |
| ; CHECK-LABEL: @overflow_sitofp( |
| ; CHECK-NEXT: ret float 0x7FF0000000000000 |
| ; |
| %i = sitofp i130 400000000000000000000000000000000000000 to float |
| ret float %i |
| } |
| |
| ; https://llvm.org/PR43907 - make sure that NaN doesn't morph into Inf. |
| ; SNaN remains SNaN. |
| |
| define float @nan_f64_trunc() { |
| ; CHECK-LABEL: @nan_f64_trunc( |
| ; CHECK-NEXT: ret float 0x7FF4000000000000 |
| ; |
| %f = fptrunc double 0x7FF0000000000001 to float |
| ret float %f |
| } |
| |
| ; Verify again with a vector and different destination type. |
| ; SNaN remains SNaN (first two elements). |
| ; QNaN remains QNaN (third element). |
| ; Lower 42 bits of NaN source payload are lost. |
| |
| define <3 x half> @nan_v3f64_trunc() { |
| ; CHECK-LABEL: @nan_v3f64_trunc( |
| ; CHECK-NEXT: ret <3 x half> <half 0xH7D00, half 0xH7D00, half 0xH7E00> |
| ; |
| %f = fptrunc <3 x double> <double 0x7FF0020000000000, double 0x7FF003FFFFFFFFFF, double 0x7FF8000000000001> to <3 x half> |
| ret <3 x half> %f |
| } |