1; RUN: llc < %s -march=nvptx -mcpu=sm_20 | FileCheck %s
2
3target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v16:16:16-v32:32:32-v64:64:64-v128:128:128-n16:32:64"
4
5@scalar1 = internal addrspace(3) global float 0.000000e+00, align 4
6@scalar2 = internal addrspace(3) global float 0.000000e+00, align 4
7
8; We shouldn't sink mul.rn.f32 to BB %merge because BB %merge post-dominates
9; BB %entry. Over-sinking created more register pressure on this example. The
10; backend would sink the fmuls to BB %merge, but not the loads for being
11; conservative on sinking memory accesses. As a result, the loads and
12; the two fmuls would be separated to two basic blocks, causing two
13; cross-BB live ranges.
14define float @post_dominate(float %x, i1 %cond) {
15; CHECK-LABEL: post_dominate(
16entry:
17  %0 = load float* addrspacecast (float addrspace(3)* @scalar1 to float*), align 4
18  %1 = load float* addrspacecast (float addrspace(3)* @scalar2 to float*), align 4
19; CHECK: ld.shared.f32
20; CHECK: ld.shared.f32
21  %2 = fmul float %0, %0
22  %3 = fmul float %1, %2
23; CHECK-NOT: bra
24; CHECK: mul.rn.f32
25; CHECK: mul.rn.f32
26  br i1 %cond, label %then, label %merge
27
28then:
29  %z = fadd float %x, %x
30  br label %then2
31
32then2:
33  %z2 = fadd float %z, %z
34  br label %merge
35
36merge:
37  %y = phi float [ 0.0, %entry ], [ %z2, %then2 ]
38  %w = fadd float %y, %3
39  ret float %w
40}
41