maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity
llvm-project/llvm/test/CodeGen/ARM/static-addr-hoisting.ll

23 lines
673 B
LLVM
Raw Normal View History

ARM: override cost function to re-enable ConstantHoisting (& fix it). At some point, ARM stopped getting any benefit from ConstantHoisting because the pass called a different variant of getIntImmCost. Reimplementing the correct variant revealed some problems, however: + ConstantHoisting was modifying switch statements. This is simply invalid, the cases must remain integer constants no matter the notional cost. + ConstantHoisting was mangling alloca instructions in the entry block. These should be handled by FrameLowering, so constants actually have a cost of 0. Worse, the resulting bitcasts meant they became dynamic allocas. rdar://25707382 llvm-svn: 266260
2016-04-14 07:08:27 +08:00
; RUN: llc -mtriple=thumbv7-apple-ios %s -o - | FileCheck %s
define void @multiple_store() {
; CHECK-LABEL: multiple_store:
; CHECK: movw r[[BASE1:[0-9]+]], #16960
; CHECK: movs [[VAL:r[0-9]+]], #42
; CHECK: movt r[[BASE1]], #15
Revert "In visitSTORE, always use FindBetterChain, rather than only when UseAA is enabled." This reverts commit r293893 which is miscompiling lua on ARM and bootstrapping for x86-windows. llvm-svn: 293915
2017-02-03 02:24:55 +08:00
; CHECK: str [[VAL]], [r[[BASE1]]]
; CHECK: str [[VAL]], [r[[BASE1]], #24]
; CHECK: str.w [[VAL]], [r[[BASE1]], #42]
ARM: override cost function to re-enable ConstantHoisting (& fix it). At some point, ARM stopped getting any benefit from ConstantHoisting because the pass called a different variant of getIntImmCost. Reimplementing the correct variant revealed some problems, however: + ConstantHoisting was modifying switch statements. This is simply invalid, the cases must remain integer constants no matter the notional cost. + ConstantHoisting was mangling alloca instructions in the entry block. These should be handled by FrameLowering, so constants actually have a cost of 0. Worse, the resulting bitcasts meant they became dynamic allocas. rdar://25707382 llvm-svn: 266260
2016-04-14 07:08:27 +08:00
; CHECK: movw r[[BASE2:[0-9]+]], #20394
; CHECK: movt r[[BASE2]], #18
; CHECK: str [[VAL]], [r[[BASE2]]]
store i32 42, i32* inttoptr(i32 1000000 to i32*)
store i32 42, i32* inttoptr(i32 1000024 to i32*)
store i32 42, i32* inttoptr(i32 1000042 to i32*)
store i32 42, i32* inttoptr(i32 1200042 to i32*)
ret void
}