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| author | Evan Cheng <evan.cheng@apple.com> | 2011-04-22 01:42:52 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2011-04-22 01:42:52 +0000 |
| commit | db6cbe1ff16d5f18bf2469fa53744e680944dc56 (patch) | |
| tree | 35d46c3921e98b06cf1efaefe174c9ae53948a58 /test/CodeGen/Thumb2 | |
| parent | d8a16241229a6d3f761e2e9fd19cbe08e614f113 (diff) | |
| download | external_llvm-db6cbe1ff16d5f18bf2469fa53744e680944dc56.zip external_llvm-db6cbe1ff16d5f18bf2469fa53744e680944dc56.tar.gz external_llvm-db6cbe1ff16d5f18bf2469fa53744e680944dc56.tar.bz2 | |
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
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129971 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen/Thumb2')
| -rw-r--r-- | test/CodeGen/Thumb2/2011-04-21-FILoweringBug.ll | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/test/CodeGen/Thumb2/2011-04-21-FILoweringBug.ll b/test/CodeGen/Thumb2/2011-04-21-FILoweringBug.ll new file mode 100644 index 0000000..604a352 --- /dev/null +++ b/test/CodeGen/Thumb2/2011-04-21-FILoweringBug.ll @@ -0,0 +1,23 @@ +; 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*) |