vendor/llvm/llvm-trunk-r351319

1 files changed, 49 insertions, 0 deletions

diff --git a/test/CodeGen/MSP430/interrupt.ll b/test/CodeGen/MSP430/interrupt.ll
new file mode 100644
index 000000000000..5fa0c849c260
--- /dev/null
+++ b/test/CodeGen/MSP430/interrupt.ll
@@ -0,0 +1,49 @@
+; RUN: llc < %s | FileCheck %s
+
+target datalayout = "e-m:e-p:16:16-i32:16-i64:16-f32:16-f64:16-a:8-n8:16-S16"
+target triple = "msp430-generic-generic"
+
+@llvm.used = appending global [1 x i8*] [i8* bitcast (void ()* @ISR to i8*)], section "llvm.metadata"
+
+; MSP430 EABI p. 3.9
+; Interrupt functions must save all the registers that are used, even those
+; that are normally considered callee-saved.
+
+; To return from an interrupt function, the function must execute the special
+; instruction RETI, which restores the SR register and branches to the PC where
+; the interrupt occurred.
+
+@g = global float 0.0
+
+define msp430_intrcc void @ISR() #0 {
+entry:
+; CHECK-LABEL: ISR:
+; CHECK: push	r15
+; CHECK: push	r14
+; CHECK: push	r13
+; CHECK: push	r12
+; CHECK: push	r11
+; CHECK: push	r10
+; CHECK: push	r9
+; CHECK: push	r8
+; CHECK: push	r7
+; CHECK: push	r6
+; CHECK: push	r5
+; CHECK: push	r4
+  %t1 = load volatile float, float* @g
+  %t2 = load volatile float, float* @g
+  %t3 = load volatile float, float* @g
+  %t4 = load volatile float, float* @g
+  %t5 = load volatile float, float* @g
+  %t6 = load volatile float, float* @g
+  %t7 = load volatile float, float* @g
+  store volatile float %t1, float* @g
+  store volatile float %t2, float* @g
+  store volatile float %t3, float* @g
+  store volatile float %t4, float* @g
+  store volatile float %t5, float* @g
+  store volatile float %t6, float* @g
+; CHECK: reti
+  ret void
+}
+