1d0ccebcd7
Assuming that the stack grows downwards, it is fine if the stack pointer is exactly at the stacklet boundary. We should use less-or-equal condition when deciding whether to skip new memory allocation. Differential Revision: https://reviews.llvm.org/D149315
66 lines
1.9 KiB
LLVM
66 lines
1.9 KiB
LLVM
; RUN: llc < %s -mtriple=thumb-linux-unknown-gnueabi -verify-machineinstrs | FileCheck %s -check-prefix=Thumb-linux
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; RUN: llc < %s -mtriple=thumb-linux-androideabi -verify-machineinstrs | FileCheck %s -check-prefix=Thumb-android
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; RUN: llc < %s -mtriple=thumb-linux-unknown-gnueabi -filetype=obj
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; RUN: llc < %s -mtriple=thumb-linux-androideabi -filetype=obj
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; Just to prevent the alloca from being optimized away
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declare void @dummy_use(ptr, i32)
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define i32 @test_basic(i32 %l) #0 {
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%mem = alloca i32, i32 %l
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call void @dummy_use (ptr %mem, i32 %l)
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%terminate = icmp eq i32 %l, 0
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br i1 %terminate, label %true, label %false
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true:
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ret i32 0
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false:
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%newlen = sub i32 %l, 1
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%retvalue = call i32 @test_basic(i32 %newlen)
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ret i32 %retvalue
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; Thumb-linux: test_basic:
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; Thumb-linux: push {r4, r5}
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; Thumb-linux: mov r5, sp
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; Thumb-linux-NEXT: ldr r4, .LCPI0_0
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; Thumb-linux-NEXT: ldr r4, [r4]
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; Thumb-linux-NEXT: cmp r4, r5
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; Thumb-linux-NEXT: bls .LBB0_2
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; Thumb-linux: mov r4, #16
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; Thumb-linux-NEXT: mov r5, #0
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; Thumb-linux-NEXT: push {lr}
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; Thumb-linux-NEXT: bl __morestack
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; Thumb-linux-NEXT: pop {r4}
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; Thumb-linux-NEXT: mov lr, r4
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; Thumb-linux-NEXT: pop {r4, r5}
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; Thumb-linux-NEXT: bx lr
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; Thumb-linux: pop {r4, r5}
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; Thumb-android: test_basic:
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; Thumb-android: push {r4, r5}
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; Thumb-android: mov r5, sp
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; Thumb-android-NEXT: ldr r4, .LCPI0_0
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; Thumb-android-NEXT: ldr r4, [r4]
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; Thumb-android-NEXT: cmp r4, r5
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; Thumb-android-NEXT: bls .LBB0_2
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; Thumb-android: mov r4, #16
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; Thumb-android-NEXT: mov r5, #0
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; Thumb-android-NEXT: push {lr}
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; Thumb-android-NEXT: bl __morestack
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; Thumb-android-NEXT: pop {r4}
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; Thumb-android-NEXT: mov lr, r4
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; Thumb-android-NEXT: pop {r4, r5}
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; Thumb-android-NEXT: bx lr
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; Thumb-android: pop {r4, r5}
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}
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attributes #0 = { "split-stack" }
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