1 ; RUN: llc -march=amdgcn -verify-machineinstrs -mtriple=amdgcn-- -o - %s | FileCheck %s
3 declare float @llvm.fma.f32(float, float, float)
5 ; This checks that rematerialization support of the coalescer does not
6 ; unnecessarily widen the register class. Without those fixes > 20 VGprs
8 ; Also check that some rematerialization of the 0 constant happened.
10 ; CHECK: v_mov_b32_e32 v{{[0-9]+}}, 0
11 ; CHECK: v_mov_b32_e32 v{{[0-9]+}}, 0
12 ; CHECK: v_mov_b32_e32 v{{[0-9]+}}, 0
13 ; CHECK: v_mov_b32_e32 v{{[0-9]+}}, 0
14 ; CHECK: ; NumVgprs: 12
15 define void @foobar(<4 x float> addrspace(1)* %out, <4 x float> addrspace(1)* %in, i32 %flag) {
17 %cmpflag = icmp eq i32 %flag, 1
18 br i1 %cmpflag, label %loop, label %exit
21 %c = phi i32 [0, %entry], [%cnext, %loop]
22 %v0 = phi float [0.0, %entry], [%fma.0, %loop]
23 %v1 = phi float [0.0, %entry], [%fma.1, %loop]
24 %v2 = phi float [0.0, %entry], [%fma.2, %loop]
25 %v3 = phi float [0.0, %entry], [%fma.3, %loop]
27 ; Try to get the 0 constant to get coalesced into a wide register
28 %blup = insertelement <4 x float> undef, float %v0, i32 0
29 store <4 x float> %blup, <4 x float> addrspace(1)* %out
31 %load = load <4 x float>, <4 x float> addrspace(1)* %in
32 %load.0 = extractelement <4 x float> %load, i32 0
33 %load.1 = extractelement <4 x float> %load, i32 1
34 %load.2 = extractelement <4 x float> %load, i32 2
35 %load.3 = extractelement <4 x float> %load, i32 3
36 %fma.0 = call float @llvm.fma.f32(float %v0, float %load.0, float %v0)
37 %fma.1 = call float @llvm.fma.f32(float %v1, float %load.1, float %v1)
38 %fma.2 = call float @llvm.fma.f32(float %v2, float %load.2, float %v2)
39 %fma.3 = call float @llvm.fma.f32(float %v3, float %load.3, float %v3)
41 %cnext = add nsw i32 %c, 1
42 %cmp = icmp eq i32 %cnext, 42
43 br i1 %cmp, label %exit, label %loop
46 %ev0 = phi float [0.0, %entry], [%fma.0, %loop]
47 %ev1 = phi float [0.0, %entry], [%fma.1, %loop]
48 %ev2 = phi float [0.0, %entry], [%fma.2, %loop]
49 %ev3 = phi float [0.0, %entry], [%fma.3, %loop]
50 %dst.0 = insertelement <4 x float> undef, float %ev0, i32 0
51 %dst.1 = insertelement <4 x float> %dst.0, float %ev1, i32 1
52 %dst.2 = insertelement <4 x float> %dst.1, float %ev2, i32 2
53 %dst.3 = insertelement <4 x float> %dst.2, float %ev3, i32 3
54 store <4 x float> %dst.3, <4 x float> addrspace(1)* %out