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test/CodeGen/ARM/reg-alloc-fixed-r6-vla.ll
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| ; Using VLAs(Variable Length Arrays) in a function will use R6 to keep track | |||||
| ; of the stack frame, and also spill/restore R6 to the stack. | |||||
| ; This tests that using -ffixed-r6 (-mattr=+reserve-r6) will stop R6 | |||||
| ; being used and also stop it being spilled/restored to the stack. | |||||
| ; RUN: llc < %s -mcpu=cortex-m0 -mtriple=thumbv7-arm-none-eabi | FileCheck %s --check-prefix=CHECK-STATIC --check-prefix=CHECK-R6 | |||||
| ; RUN: llc < %s -mcpu=cortex-m0 -mtriple=thumbv7-arm-none-eabi -mattr=+reserve-r6 | FileCheck %s --check-prefix=CHECK-STATIC --check-prefix=CHECK-NO-R6 | |||||
| define void @f() #0 { | |||||
| entry: | |||||
| %i = alloca i32, align 4 | |||||
| store i32 0, i32* %i, align 4 | |||||
| %saved_stack = alloca i8*, align 4 | |||||
| %0 = call i8* @llvm.stacksave() | |||||
| store i8* %0, i8** %saved_stack, align 4 | |||||
| %__vla_expr0 = alloca i32, align 4 | |||||
| %1 = load i32, i32* %i, align 4 | |||||
| %vla = alloca double, i32 %1, align 8 | |||||
| store i32 %1, i32* %__vla_expr0, align 4 | |||||
| %2 = load i8*, i8** %saved_stack, align 4 | |||||
| call void @llvm.stackrestore(i8* %2) | |||||
| ret void | |||||
| } | |||||
| declare i8* @llvm.stacksave() #1 | |||||
| declare void @llvm.stackrestore(i8* %ptr) #1 | |||||
| attributes #0 = { noinline nounwind "stackrealign" } | |||||
| attributes #1 = { nounwind } | |||||
| ; CHECK-STATIC: push {r4, | |||||
| ; CHECK-R6: r6 | |||||
| ; CHECK-NO-R6-NOT: r6 | |||||
| ; CHECK-STATIC: lr} | |||||
| ; CHECK-R6: r6 | |||||
| ; CHECK-NO-R6-NOT: r6 | |||||
| ; CHECK-STATIC: pop {r4, | |||||
| ; CHECK-R6: r6 | |||||
| ; CHECK-NO-R6-NOT: r6 | |||||
| ; CHECK-STATIC: pc} | |||||