1 ; RUN: llc -march=amdgcn -verify-machineinstrs -mtriple=amdgcn-- -o - %s | FileCheck %s 2 3 declare float @llvm.fma.f32(float, float, float) 4 5 ; This checks that rematerialization support of the coalescer does not 6 ; unnecessarily widen the register class. Without those fixes > 20 VGprs 7 ; are used here 8 ; Also check that some rematerialization of the 0 constant happened. 9 ; CHECK-LABEL: foobar 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 ; It's probably OK if this is slightly higher: 15 ; CHECK: ; NumVgprs: 9 16 define void @foobar(<4 x float> addrspace(1)* %out, <4 x float> addrspace(1)* %in, i32 %flag) { 17 entry: 18 %cmpflag = icmp eq i32 %flag, 1 19 br i1 %cmpflag, label %loop, label %exit 20 21 loop: 22 %c = phi i32 [0, %entry], [%cnext, %loop] 23 %v0 = phi float [0.0, %entry], [%fma.0, %loop] 24 %v1 = phi float [0.0, %entry], [%fma.1, %loop] 25 %v2 = phi float [0.0, %entry], [%fma.2, %loop] 26 %v3 = phi float [0.0, %entry], [%fma.3, %loop] 27 28 ; Try to get the 0 constant to get coalesced into a wide register 29 %blup = insertelement <4 x float> undef, float %v0, i32 0 30 store <4 x float> %blup, <4 x float> addrspace(1)* %out 31 32 %load = load <4 x float>, <4 x float> addrspace(1)* %in 33 %load.0 = extractelement <4 x float> %load, i32 0 34 %load.1 = extractelement <4 x float> %load, i32 1 35 %load.2 = extractelement <4 x float> %load, i32 2 36 %load.3 = extractelement <4 x float> %load, i32 3 37 %fma.0 = call float @llvm.fma.f32(float %v0, float %load.0, float %v0) 38 %fma.1 = call float @llvm.fma.f32(float %v1, float %load.1, float %v1) 39 %fma.2 = call float @llvm.fma.f32(float %v2, float %load.2, float %v2) 40 %fma.3 = call float @llvm.fma.f32(float %v3, float %load.3, float %v3) 41 42 %cnext = add nsw i32 %c, 1 43 %cmp = icmp eq i32 %cnext, 42 44 br i1 %cmp, label %exit, label %loop 45 46 exit: 47 %ev0 = phi float [0.0, %entry], [%fma.0, %loop] 48 %ev1 = phi float [0.0, %entry], [%fma.1, %loop] 49 %ev2 = phi float [0.0, %entry], [%fma.2, %loop] 50 %ev3 = phi float [0.0, %entry], [%fma.3, %loop] 51 %dst.0 = insertelement <4 x float> undef, float %ev0, i32 0 52 %dst.1 = insertelement <4 x float> %dst.0, float %ev1, i32 1 53 %dst.2 = insertelement <4 x float> %dst.1, float %ev2, i32 2 54 %dst.3 = insertelement <4 x float> %dst.2, float %ev3, i32 3 55 store <4 x float> %dst.3, <4 x float> addrspace(1)* %out 56 ret void 57 } 58
