derek.holloway
7502bf64a4
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33 lines
785 B
LLVM
33 lines
785 B
LLVM
; RUN: opt < %s -passes="slsr" -S | FileCheck %s
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target datalayout = "e-i64:64-v16:16-v32:32-n16:32:64"
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%struct.B = type { i16 }
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%struct.A = type { %struct.B, %struct.B }
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define i32 @pick(i32 %0, ptr %addr) {
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; `d` can be optimized by 2 approaches
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; 1. a = 1 + 1 * %0
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; d = 1 + 8 * %0
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; = a + 7 * %0
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; 2. c = (8 * %0) + 3
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; d = (8 * %0) + 1
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; = c - 2
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; Pick candidate (2) as it can save 1 instruction from (7 * %0)
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;
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; CHECK-LABEL: pick
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; CHECK: [[A:%.*]] = add i32 %0, 1
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; CHECK: [[B:%.*]] = shl i32 %0, 3
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; CHECK: [[C:%.*]] = add i32 [[B]], 3
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; CHECK: store i32 [[C]], ptr %addr
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; CHECK: [[D:%.*]] = add i32 [[C]], -2
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; CHECK: ret i32 %d
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%a = add i32 %0, 1
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%b = shl i32 %0, 3
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%c = add i32 %b, 3
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store i32 %c, ptr %addr
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%d = add i32 %b, 1
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ret i32 %d
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}
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