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https://github.com/c64scene-ar/llvm-6502.git
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7a6aa1a391
exact/nsw/nuw shifts and have instcombine infer them when it can prove that the relevant properties are true for a given shift without them. Also, a variety of refactoring to use the new patternmatch logic thrown in for good luck. I believe that this takes care of a bunch of related code quality issues attached to PR8862. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125267 91177308-0d34-0410-b5e6-96231b3b80d8
40 lines
793 B
LLVM
40 lines
793 B
LLVM
; RUN: opt < %s -instcombine -S | FileCheck %s
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; CHECK: @sub1
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; CHECK: %y = sub i32 0, %x
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; CHECK: %z = sdiv i32 %y, 337
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; CHECK: ret i32 %z
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define i32 @sub1(i32 %x) {
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%y = sub i32 0, %x
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%z = sdiv i32 %y, 337
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ret i32 %z
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}
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; CHECK: @sub2
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; CHECK: %z = sdiv i32 %x, -337
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; CHECK: ret i32 %z
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define i32 @sub2(i32 %x) {
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%y = sub nsw i32 0, %x
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%z = sdiv i32 %y, 337
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ret i32 %z
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}
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; CHECK: @shl_icmp
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; CHECK: %B = icmp eq i64 %X, 0
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; CHECK: ret i1 %B
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define i1 @shl_icmp(i64 %X) nounwind {
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%A = shl nuw i64 %X, 2 ; X/4
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%B = icmp eq i64 %A, 0
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ret i1 %B
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}
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; CHECK: @shl1
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; CHECK: %B = shl nuw nsw i64 %A, 8
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; CHECK: ret i64 %B
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define i64 @shl1(i64 %X, i64* %P) nounwind {
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%A = and i64 %X, 312
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store i64 %A, i64* %P ; multiple uses of A.
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%B = shl i64 %A, 8
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ret i64 %B
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}
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