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; 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
}
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