PowerPC half precision float shenanigans #45121
Description
| Bugzilla Link | 45776 |
| Resolution | FIXED |
| Resolved on | Jun 22, 2020 15:47 |
| Version | trunk |
| OS | All |
| Blocks | #44654 |
| CC | @nemanjai,@tstellar |
| Fixed by commit(s) | 1a493b0 1abba52 |
Extended Description
I recently fixed #39212 but in doing so, missed a bunch of other cases that cause crashes in the PPC back end. Tests borrowed from the X86 back end.
All of the following crash the PPC back end with -mcpu=pwr9:
define i64 @test_fptosi_i64(half* %p) #0 {
%a = load half, half* %p, align 2
%r = fptosi half %a to i64
ret i64 %r
}
define void @test_sitofp_i64(i64 %a, half* %p) #0 {
%r = sitofp i64 %a to half
store half %r, half* %p
ret void
}
define i64 @test_fptoui_i64(half* %p) #0 {
%a = load half, half* %p, align 2
%r = fptoui half %a to i64
ret i64 %r
}
define void @test_uitofp_i64(i64 %a, half* %p) #0 {
%r = uitofp i64 %a to half
store half %r, half* %p
ret void
}
define <4 x float> @test_extend32_vec4(<4 x half>* %p) #0 {
%a = load <4 x half>, <4 x half>* %p, align 8
%b = fpext <4 x half> %a to <4 x float>
ret <4 x float> %b
}
define <4 x double> @test_extend64_vec4(<4 x half>* %p) #0 {
%a = load <4 x half>, <4 x half>* %p, align 8
%b = fpext <4 x half> %a to <4 x double>
ret <4 x double> %b
}
define void @test_trunc32_vec4(<4 x float> %a, <4 x half>* %p) #0 {
%v = fptrunc <4 x float> %a to <4 x half>
store <4 x half> %v, <4 x half>* %p
ret void
}
define void @test_trunc64_vec4(<4 x double> %a, <4 x half>* %p) #0 {
%v = fptrunc <4 x double> %a to <4 x half>
store <4 x half> %v, <4 x half>* %p
ret void
}
And the last two crash the back end with -mcpu=pwr8.