[X86] Add test case to show that we don't set the kill flag properly for fast isel handling of fneg.

topperc · topperc · commit ccb55c763ac1 · 2019-05-06T23:08:17.000Z
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@360096 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CodeGen/X86/fast-isel-fneg-kill.ll b/test/CodeGen/X86/fast-isel-fneg-kill.ll
@@ -0,0 +1,22 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc < %s -fast-isel -fast-isel-abort=3 -mtriple=x86_64-apple-darwin10 -stop-after=expand-isel-pseudos | FileCheck %s
+
+; Make sure we output the right kill flag for the xor conversion.
+
+define void @goo(double* %x, double* %y) nounwind {
+; CHECK: %[[REG2:.*]]:gr64 = COPY $rsi
+; CHECK-NEXT: %[[REG0:.*]]:gr64 = COPY $rdi
+; CHECK-NEXT: %[[REG1:.*]]:gr64 = COPY killed %[[REG0]]
+; CHECK-NEXT: %[[REG3:.*]]:gr64 = COPY killed %[[REG2]]
+; CHECK-NEXT: %[[REG10:.*]]:fr64 = MOVSDrm %[[REG1]], 1, $noreg, 0, $noreg :: (load 8 from %ir.x)
+; CHECK-NEXT: %[[REG6:.*]]:gr64 = MOVSDto64rr %[[REG10]]
+; CHECK-NEXT: %[[REG7:.*]]:gr64 = MOV64ri -9223372036854775808
+; CHECK-NEXT: %[[REG8:.*]]:gr64 = XOR64rr killed %[[REG6]], %[[REG7]], implicit-def $eflags
+; CHECK-NEXT: %[[REG9:.*]]:fr64 = MOV64toSDrr killed %[[REG8]]
+; CHECK-NEXT: MOVSDmr %[[REG3]], 1, $noreg, 0, $noreg, killed %[[REG9]] :: (store 8 into %ir.y)
+; CHECK-NEXT: RETQ
+  %a = load double, double* %x
+  %b = fsub double -0.0, %a
+  store double %b, double* %y
+  ret void
+}
