Imported Upstream version 5.18.0.179

Former-commit-id: 67aa10e65b237e1c4537630979ee99ebe1374215

external/llvm/test/CodeGen/X86/fp-stack-2results.ll

@@ -0,0 +1,66 @@
+; RUN: llc < %s -mtriple=i686-- | grep fldz
+; RUN: llc < %s -mtriple=x86_64-- | grep fld1
+
+%0 = type { x86_fp80, x86_fp80 }
+
+; This is basically this code on x86-64:
+; _Complex long double test() { return 1.0; }
+define %0 @test() {
+  %A = fpext double 1.0 to x86_fp80
+  %B = fpext double 0.0 to x86_fp80
+  %mrv = insertvalue %0 undef, x86_fp80 %A, 0
+  %mrv1 = insertvalue %0 %mrv, x86_fp80 %B, 1
+  ret %0 %mrv1
+}
+
+
+;_test2:
+;	fld1
+;	fld	%st(0)
+;	ret
+define %0 @test2() {
+  %A = fpext double 1.0 to x86_fp80
+  %mrv = insertvalue %0 undef, x86_fp80 %A, 0
+  %mrv1 = insertvalue %0 %mrv, x86_fp80 %A, 1
+  ret %0 %mrv1
+}
+
+; Uses both values.
+define void @call1(x86_fp80 *%P1, x86_fp80 *%P2) {
+  %a = call %0 @test()
+  %b = extractvalue %0 %a, 0
+  store x86_fp80 %b, x86_fp80* %P1
+
+  %c = extractvalue %0 %a, 1
+  store x86_fp80 %c, x86_fp80* %P2
+  ret void 
+}
+
+; Uses both values, requires fxch
+define void @call2(x86_fp80 *%P1, x86_fp80 *%P2) {
+  %a = call %0 @test()
+  %b = extractvalue %0 %a, 1
+  store x86_fp80 %b, x86_fp80* %P1
+
+  %c = extractvalue %0 %a, 0
+  store x86_fp80 %c, x86_fp80* %P2
+  ret void
+}
+
+; Uses ST(0), ST(1) is dead but must be popped.
+define void @call3(x86_fp80 *%P1, x86_fp80 *%P2) {
+  %a = call %0 @test()
+  %b = extractvalue %0 %a, 0
+  store x86_fp80 %b, x86_fp80* %P1
+  ret void 
+}
+
+; Uses ST(1), ST(0) is dead and must be popped.
+define void @call4(x86_fp80 *%P1, x86_fp80 *%P2) {
+  %a = call %0 @test()
+
+  %c = extractvalue %0 %a, 1
+  store x86_fp80 %c, x86_fp80* %P2
+  ret void 
+}
+