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Fix convertBFloatAPFloatToAPInt for NaN/Inf values

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Bfloat type has an 8-bit exponent so the exponent of NaN/Inf numbers
must be 0xff instead of 0x1f. This is probably a copy-paste mistake
from the half float type.

Reviewed By: lattner

Differential Revision: https://reviews.llvm.org/D81302
This commit is contained in:
Diego Caballero 2020-06-05 17:06:42 -07:00
parent 418500e026
commit 09d4df00f3
2 changed files with 26 additions and 2 deletions
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4
lib/Support/APFloat.cpp
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@ -3278,11 +3278,11 @@ APInt IEEEFloat::convertBFloatAPFloatToAPInt() const {
myexponent = 0;
mysignificand = 0;
} else if (category == fcInfinity) {
myexponent = 0x1f;
myexponent = 0xff;
mysignificand = 0;
} else {
assert(category == fcNaN && "Unknown category!");
myexponent = 0x1f;
myexponent = 0xff;
mysignificand = (uint32_t)*significandParts();
}

24
test/Assembler/bfloat.ll
View File

@ -36,3 +36,27 @@ define float @check_bfloat_convert() {
; OPT: 0x4191A00000000000
ret float %tmp
}
; ASSEM-DISASS-LABEL @snan_bfloat
define bfloat @snan_bfloat() {
; ASSEM-DISASS: ret bfloat 0xR7F81
ret bfloat 0xR7F81
}
; ASSEM-DISASS-LABEL @qnan_bfloat
define bfloat @qnan_bfloat() {
; ASSEM-DISASS: ret bfloat 0xR7FC0
ret bfloat 0xR7FC0
}
; ASSEM-DISASS-LABEL @pos_inf_bfloat
define bfloat @pos_inf_bfloat() {
; ASSEM-DISASS: ret bfloat 0xR7F80
ret bfloat 0xR7F80
}
; ASSEM-DISASS-LABEL @neg_inf_bfloat
define bfloat @neg_inf_bfloat() {
; ASSEM-DISASS: ret bfloat 0xRFF80
ret bfloat 0xRFF80
}