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llvm-mirror/test/CodeGen/Thumb2/2011-04-21-FILoweringBug.ll
Evan Cheng 34e8479411 In Thumb2 mode, lower frame indix references to:
add <rd>, sp, #<imm8>
ldr <rd>, [sp, #<imm8>]
When the offset from sp is multiple of 4 and in range of 0-1020.
This saves code size by utilizing 16-bit instructions.

rdar://9321541

llvm-svn: 129971
2011-04-22 01:42:52 +00:00

24 lines
601 B
LLVM

; RUN: llc < %s -mtriple=thumbv7-apple-darwin | FileCheck %s
; Use sp, #imm to lower frame indices when the offset is multiple of 4
; and in the range of 0-1020. This saves code size by utilizing
; 16-bit instructions.
; rdar://9321541
define i32 @t() nounwind {
entry:
; CHECK: t:
; CHECK: sub sp, #12
; CHECK-NOT: sub
; CHECK: add r0, sp, #4
; CHECK: add r1, sp, #8
; CHECK: mov r2, sp
%size = alloca i32, align 4
%count = alloca i32, align 4
%index = alloca i32, align 4
%0 = call i32 @foo(i32* %count, i32* %size, i32* %index) nounwind
ret i32 %0
}
declare i32 @foo(i32*, i32*, i32*)