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3d26dcef22
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
23 lines
673 B
LLVM
23 lines
673 B
LLVM
; RUN: llc -mtriple=thumbv7-apple-ios %s -o - | FileCheck %s
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define void @multiple_store() {
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; CHECK-LABEL: multiple_store:
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; CHECK: movw r[[BASE1:[0-9]+]], #16960
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; CHECK: movs [[VAL:r[0-9]+]], #42
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; CHECK: movt r[[BASE1]], #15
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; CHECK: str [[VAL]], [r[[BASE1]]]
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; CHECK: str [[VAL]], [r[[BASE1]], #24]
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; CHECK: str.w [[VAL]], [r[[BASE1]], #42]
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; CHECK: movw r[[BASE2:[0-9]+]], #20394
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; CHECK: movt r[[BASE2]], #18
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; CHECK: str [[VAL]], [r[[BASE2]]]
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store i32 42, i32* inttoptr(i32 1000000 to i32*)
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store i32 42, i32* inttoptr(i32 1000024 to i32*)
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store i32 42, i32* inttoptr(i32 1000042 to i32*)
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store i32 42, i32* inttoptr(i32 1200042 to i32*)
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ret void
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}
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