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c0e2b430f9
This patch allows `r7` to be used, regardless of its use as a frame pointer, as a temporary register when popping `lr`, and also falls back to using a high temporary register if, for some reason, we weren't able to find a suitable low one. Differential revision: https://reviews.llvm.org/D40961 Fixes https://bugs.llvm.org/show_bug.cgi?id=35481 llvm-svn: 321989
25 lines
833 B
LLVM
25 lines
833 B
LLVM
; RUN: llc -mtriple thumbv4t-eabi < %s | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-V4T
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; RUN: llc -mtriple armv8m.base-eabi < %s | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-V8M
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target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
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; Function Attrs: nounwind
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define <4 x i32> @f() local_unnamed_addr #0 {
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entry:
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%call = tail call i32 @h(i32 1)
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%call1 = tail call <4 x i32> @g(i32 %call, i32 2, i32 3, i32 4)
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ret <4 x i32> %call1
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; CHECK: ldr r7, [sp, #4]
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; CHECK-NEXT: mov lr, r7
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; CHECK-NEXT: pop {r7}
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; CHECK-NEXT: add sp, #4
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; CHECK-V47: bx lr
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; CHECK-V8M: b g
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}
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declare <4 x i32> @g(i32, i32, i32, i32) local_unnamed_addr
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declare i32 @h(i32) local_unnamed_addr
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attributes #0 = { "disable-tail-calls"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" }
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