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1; Test atomic double subtraction. Expect a compare-and-swap loop.2;3; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s4 5define double @f1(ptr %src, double %b) {6; CHECK-LABEL: f1:7; CHECK: ld [[F:%f[0-9]+]], 0(%r2)8; CHECK: [[L:\.L.+]]:9; CHECK: lgdr [[RI:%r[0-9]+]], [[F]]10; CHECK: sdbr [[F]], %f011; CHECK: lgdr [[RO:%r[0-9]+]], [[F]]12; CHECK: csg [[RI]], [[RO]], 0(%r2)13; CHECK: ldgr [[F]], [[RI]]14; CHECK: jl [[L]]15; CHECK: ldr %f0, [[F]]16; CHECK: br %r1417 %res = atomicrmw fsub ptr %src, double %b seq_cst18 ret double %res19}20