File: fast-isel-float-half-convertion.ll

package info (click to toggle)
llvm-toolchain-19 1%3A19.1.7-3
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid, trixie
  • size: 1,998,520 kB
  • sloc: cpp: 6,951,680; ansic: 1,486,157; asm: 913,598; python: 232,024; f90: 80,126; objc: 75,281; lisp: 37,276; pascal: 16,990; sh: 10,009; ml: 5,058; perl: 4,724; awk: 3,523; makefile: 3,167; javascript: 2,504; xml: 892; fortran: 664; cs: 573
file content (29 lines) | stat: -rw-r--r-- 948 bytes parent folder | download | duplicates (21) 
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
 
; RUN: llc -fast-isel -fast-isel-abort=1 -asm-verbose=false -mtriple=x86_64-unknown-unknown -mattr=+f16c < %s | FileCheck %s
; RUN: llc -fast-isel -fast-isel-abort=1 -asm-verbose=false -mtriple=x86_64-unknown-unknown -mattr=+avx512vl < %s | FileCheck %s

; Verify that fast-isel correctly expands float-half conversions.

define i16 @test_fp32_to_fp16(float %a) {
; CHECK-LABEL: test_fp32_to_fp16:
; CHECK: vcvtps2ph $4, %xmm0, %xmm0
; CHECK-NEXT: vmovd %xmm0, %eax
; CHECK-NEXT: retq
entry:
  %0 = call i16 @llvm.convert.to.fp16.f32(float %a)
  ret i16 %0
}

define float @test_fp16_to_fp32(i32 %a) {
; CHECK-LABEL: test_fp16_to_fp32:
; CHECK: movzwl %di, %eax
; CHECK-NEXT: vmovd %eax, %xmm0
; CHECK-NEXT: vcvtph2ps %xmm0, %xmm0
; CHECK-NEXT: retq
entry:
  %0 = trunc i32 %a to i16
  %1 = call float @llvm.convert.from.fp16.f32(i16 %0)
  ret float %1
}

declare i16 @llvm.convert.to.fp16.f32(float)
declare float @llvm.convert.from.fp16.f32(i16)