1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
|
; RUN: llc < %s | FileCheck %s --check-prefix=CHECK --check-prefix=SAFE
; RUN: llc < %s -enable-unsafe-fp-math | FileCheck %s --check-prefix=CHECK --check-prefix=UNSAFE
target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64--"
; CHECK-LABEL: double_rounding:
; SAFE: callq __trunctfdf2
; SAFE-NEXT: cvtsd2ss %xmm0
; UNSAFE: callq __trunctfsf2
; UNSAFE-NOT: cvt
define void @double_rounding(fp128* %x, float* %f) {
entry:
%0 = load fp128, fp128* %x, align 16
%1 = fptrunc fp128 %0 to double
%2 = fptrunc double %1 to float
store float %2, float* %f, align 4
ret void
}
; CHECK-LABEL: double_rounding_precise_first:
; CHECK: fstps (%
; CHECK-NOT: fstpl
define void @double_rounding_precise_first(float* %f) {
entry:
; Hack, to generate a precise FP_ROUND to double
%precise = call double asm sideeffect "fld %st(0)", "={st(0)}"()
%0 = fptrunc double %precise to float
store float %0, float* %f, align 4
ret void
}
|
