derek.holloway
7502bf64a4
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42 lines
1.4 KiB
LLVM
42 lines
1.4 KiB
LLVM
; RUN: llc < %s -mtriple=nvptx64 -mcpu=sm_20 | FileCheck %s
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; RUN: %if ptxas %{ llc < %s -mtriple=nvptx64 -mcpu=sm_20 | %ptxas-verify %}
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target 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"
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@scalar1 = internal addrspace(3) global float 0.000000e+00, align 4
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@scalar2 = internal addrspace(3) global float 0.000000e+00, align 4
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; We shouldn't sink mul.rn.f32 to BB %merge because BB %merge post-dominates
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; BB %entry. Over-sinking created more register pressure on this example. The
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; backend would sink the fmuls to BB %merge, but not the loads for being
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; conservative on sinking memory accesses. As a result, the loads and
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; the two fmuls would be separated to two basic blocks, causing two
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; cross-BB live ranges.
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define float @post_dominate(float %x, i1 %cond) {
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; CHECK-LABEL: post_dominate(
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entry:
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%0 = load float, ptr addrspacecast (ptr addrspace(3) @scalar1 to ptr), align 4
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%1 = load float, ptr addrspacecast (ptr addrspace(3) @scalar2 to ptr), align 4
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; CHECK: ld.shared.b32
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; CHECK: ld.shared.b32
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%2 = fmul float %0, %0
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%3 = fmul float %1, %2
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; CHECK-NOT: bra
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; CHECK: mul.rn.f32
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; CHECK: mul.rn.f32
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br i1 %cond, label %then, label %merge
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then:
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%z = fadd float %x, %x
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br label %then2
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then2:
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%z2 = fadd float %z, %z
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br label %merge
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merge:
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%y = phi float [ 0.0, %entry ], [ %z2, %then2 ]
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%w = fadd float %y, %3
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ret float %w
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}
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