[NFC][Test] Add a test to verify the DAGCombine of fma

llvm/test/CodeGen/PowerPC/fma-combine.ll

@@ -0,0 +1,143 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc -mtriple=powerpc64le-unknown-linux-gnu -enable-unsafe-fp-math  < %s | FileCheck -check-prefix=CHECK-FAST %s
+; RUN: llc -mtriple=powerpc64le-unknown-linux-gnu -enable-unsafe-fp-math -mattr=-vsx < %s | FileCheck -check-prefix=CHECK-FAST-NOVSX %s
+; RUN: llc -mtriple=powerpc64le-unknown-linux-gnu < %s | FileCheck %s
+
+define double @fma_combine1(double %a, double %b, double %c) {
+; CHECK-FAST-LABEL: fma_combine1:
+; CHECK-FAST:       # %bb.0: # %entry
+; CHECK-FAST-NEXT:    xsnegdp 0, 3
+; CHECK-FAST-NEXT:    xsmsubadp 1, 0, 2
+; CHECK-FAST-NEXT:    blr
+;
+; CHECK-FAST-NOVSX-LABEL: fma_combine1:
+; CHECK-FAST-NOVSX:       # %bb.0: # %entry
+; CHECK-FAST-NOVSX-NEXT:    fneg 0, 3
+; CHECK-FAST-NOVSX-NEXT:    fmsub 1, 0, 2, 1
+; CHECK-FAST-NOVSX-NEXT:    blr
+;
+; CHECK-LABEL: fma_combine1:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    xsnegdp 0, 3
+; CHECK-NEXT:    xsmuldp 0, 0, 2
+; CHECK-NEXT:    xssubdp 1, 0, 1
+; CHECK-NEXT:    blr
+entry:
+  %fneg1 = fneg double %c
+  %mul = fmul double %fneg1, %b
+  %add = fsub double %mul, %a
+  ret double %add
+}
+
+define double @fma_combine2(double %a, double %b, double %c) {
+; CHECK-FAST-LABEL: fma_combine2:
+; CHECK-FAST:       # %bb.0: # %entry
+; CHECK-FAST-NEXT:    xsnegdp 0, 3
+; CHECK-FAST-NEXT:    xsmsubadp 1, 2, 0
+; CHECK-FAST-NEXT:    blr
+;
+; CHECK-FAST-NOVSX-LABEL: fma_combine2:
+; CHECK-FAST-NOVSX:       # %bb.0: # %entry
+; CHECK-FAST-NOVSX-NEXT:    fneg 0, 3
+; CHECK-FAST-NOVSX-NEXT:    fmsub 1, 2, 0, 1
+; CHECK-FAST-NOVSX-NEXT:    blr
+;
+; CHECK-LABEL: fma_combine2:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    xsnegdp 0, 3
+; CHECK-NEXT:    xsmuldp 0, 2, 0
+; CHECK-NEXT:    xssubdp 1, 0, 1
+; CHECK-NEXT:    blr
+entry:
+  %fneg1 = fneg double %c
+  %mul = fmul double %b, %fneg1
+  %add = fsub double %mul, %a
+  ret double %add
+}
+
+@v = common local_unnamed_addr global double 0.000000e+00, align 8
+@z = common local_unnamed_addr global double 0.000000e+00, align 8
+define double @fma_combine_two_uses(double %a, double %b, double %c) {
+; CHECK-FAST-LABEL: fma_combine_two_uses:
+; CHECK-FAST:       # %bb.0: # %entry
+; CHECK-FAST-NEXT:    xsnegdp 0, 3
+; CHECK-FAST-NEXT:    addis 3, 2, v@toc@ha
+; CHECK-FAST-NEXT:    addis 4, 2, z@toc@ha
+; CHECK-FAST-NEXT:    xsnegdp 3, 1
+; CHECK-FAST-NEXT:    xsmsubadp 1, 0, 2
+; CHECK-FAST-NEXT:    stfd 0, z@toc@l(4)
+; CHECK-FAST-NEXT:    stfd 3, v@toc@l(3)
+; CHECK-FAST-NEXT:    blr
+;
+; CHECK-FAST-NOVSX-LABEL: fma_combine_two_uses:
+; CHECK-FAST-NOVSX:       # %bb.0: # %entry
+; CHECK-FAST-NOVSX-NEXT:    fneg 3, 3
+; CHECK-FAST-NOVSX-NEXT:    addis 3, 2, v@toc@ha
+; CHECK-FAST-NOVSX-NEXT:    addis 4, 2, z@toc@ha
+; CHECK-FAST-NOVSX-NEXT:    fmsub 0, 3, 2, 1
+; CHECK-FAST-NOVSX-NEXT:    fneg 2, 1
+; CHECK-FAST-NOVSX-NEXT:    stfd 3, z@toc@l(4)
+; CHECK-FAST-NOVSX-NEXT:    fmr 1, 0
+; CHECK-FAST-NOVSX-NEXT:    stfd 2, v@toc@l(3)
+; CHECK-FAST-NOVSX-NEXT:    blr
+;
+; CHECK-LABEL: fma_combine_two_uses:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    xsnegdp 3, 3
+; CHECK-NEXT:    addis 3, 2, v@toc@ha
+; CHECK-NEXT:    addis 4, 2, z@toc@ha
+; CHECK-NEXT:    xsmuldp 0, 3, 2
+; CHECK-NEXT:    stfd 3, z@toc@l(4)
+; CHECK-NEXT:    xsnegdp 2, 1
+; CHECK-NEXT:    xssubdp 0, 0, 1
+; CHECK-NEXT:    stfd 2, v@toc@l(3)
+; CHECK-NEXT:    fmr 1, 0
+; CHECK-NEXT:    blr
+entry:
+  %fneg = fneg double %a
+  store double %fneg, double* @v, align 8
+  %fneg1 = fneg double %c
+  store double %fneg1, double* @z, align 8
+  %mul = fmul double %fneg1, %b
+  %add = fsub double %mul, %a
+  ret double %add
+}
+
+define double @fma_combine_one_use(double %a, double %b, double %c) {
+; CHECK-FAST-LABEL: fma_combine_one_use:
+; CHECK-FAST:       # %bb.0: # %entry
+; CHECK-FAST-NEXT:    xsnegdp 0, 3
+; CHECK-FAST-NEXT:    addis 3, 2, v@toc@ha
+; CHECK-FAST-NEXT:    xsnegdp 3, 1
+; CHECK-FAST-NEXT:    xsmsubadp 1, 0, 2
+; CHECK-FAST-NEXT:    stfd 3, v@toc@l(3)
+; CHECK-FAST-NEXT:    blr
+;
+; CHECK-FAST-NOVSX-LABEL: fma_combine_one_use:
+; CHECK-FAST-NOVSX:       # %bb.0: # %entry
+; CHECK-FAST-NOVSX-NEXT:    fneg 0, 3
+; CHECK-FAST-NOVSX-NEXT:    addis 3, 2, v@toc@ha
+; CHECK-FAST-NOVSX-NEXT:    fmsub 0, 0, 2, 1
+; CHECK-FAST-NOVSX-NEXT:    fneg 2, 1
+; CHECK-FAST-NOVSX-NEXT:    fmr 1, 0
+; CHECK-FAST-NOVSX-NEXT:    stfd 2, v@toc@l(3)
+; CHECK-FAST-NOVSX-NEXT:    blr
+;
+; CHECK-LABEL: fma_combine_one_use:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    xsnegdp 0, 3
+; CHECK-NEXT:    addis 3, 2, v@toc@ha
+; CHECK-NEXT:    xsmuldp 0, 0, 2
+; CHECK-NEXT:    xsnegdp 2, 1
+; CHECK-NEXT:    xssubdp 0, 0, 1
+; CHECK-NEXT:    stfd 2, v@toc@l(3)
+; CHECK-NEXT:    fmr 1, 0
+; CHECK-NEXT:    blr
+entry:
+  %fneg = fneg double %a
+  store double %fneg, double* @v, align 8
+  %fneg1 = fneg double %c
+  %mul = fmul double %fneg1, %b
+  %add = fsub double %mul, %a
+  ret double %add
+}