Imported Upstream version 6.0.0.172

Former-commit-id: f3cc9b82f3e5bd8f0fd3ebc098f789556b44e9cd

external/llvm/test/CodeGen/ARM/tail-call-float.ll

@@ -0,0 +1,49 @@
+; RUN: llc -mtriple armv7 -target-abi aapcs -float-abi soft -O0 -o - < %s \
+; RUN:   | FileCheck %s -check-prefix CHECK-SOFT -check-prefix CHECK
+; RUN: llc -mtriple armv7 -target-abi aapcs -float-abi hard -O0 -o - < %s \
+; RUN:   | FileCheck %s -check-prefix CHECK-HARD -check-prefix CHECK
+
+; Tests for passing floating-point regs. Variadic functions will always use
+; general-purpose registers. Standard functions will use the floating-point
+; registers if there is hardware FP available.
+
+declare i1 @non_variadic(float, float, float, float)
+declare i1 @non_variadic_big(float, float, float, float, float, float)
+declare i1 @variadic(float, ...)
+
+define void @non_variadic_fp(float %x, float %y) {
+; CHECK-LABEL: non_variadic_fp:
+; CHECK: b non_variadic
+entry:
+  %call = tail call i1 (float, float, float, float) @non_variadic(float %y, float %x, float %x, float %y)
+  ret void
+}
+
+define void @variadic_fp(float %x, float %y) {
+; CHECK-LABEL: variadic_fp:
+; CHECK: b variadic
+entry:
+  %call = tail call i1 (float, ...) @variadic(float %y, float %x, float %x, float %y)
+  ret void
+}
+
+; With soft-float, general-purpose registers are used and there are not enough
+; of them to handle the 6 arguments. With hard-float, we have plenty of regs
+; (s0-s15) to pass FP arguments.
+define void @non_variadic_fp_big(float %x, float %y) {
+; CHECK-LABEL: non_variadic_fp_big:
+; CHECK-SOFT: bl non_variadic_big
+; CHECK-HARD: b non_variadic_big
+entry:
+  %call = tail call i1 (float, float, float, float, float, float) @non_variadic_big(float %y, float %x, float %x, float %y, float %x, float %y)
+  ret void
+}
+
+; Variadic functions cannot use FP regs to pass arguments; only GP regs.
+define void @variadic_fp_big(float %x, float %y) {
+; CHECK-LABEL: variadic_fp_big:
+; CHECK: bl variadic
+entry:
+  %call = tail call i1 (float, ...) @variadic(float %y, float %x, float %x, float %y, float %x, float %y)
+  ret void
+}