https://bugs.llvm.org/show_bug.cgi?id=42823
Bug ID: 42823
Summary: [DivRemPairs] Broken handling of RAUW
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Scalar Optimizations
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
https://reviews.llvm.org/D65298 added recomposition of expanded form of rem
into rem instruction, and that broke test-suite.
The bug is due to the fact that that pass does RAUW, but does nothing
about it's internal maps, the Values in them don't get updated.
That variation of a bug can be exposed even without that patch with this IR:
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "aarch64-unknown-linux-gnu"
define i32 @d(i32 %X, i32 %Y, i32 %Z) {
bb:
%t0 = mul nsw i32 %Z, %Y
%t1 = sdiv i32 %X, %t0
%t2 = mul nsw i32 %t0, %t1
%t3.recomposed = srem i32 %X, %t0
%t4 = sdiv i32 %t3.recomposed, %Y
%t5 = mul nsw i32 %t4, %Y
%t6.recomposed = srem i32 %t3.recomposed, %Y
ret i32 %t6.recomposed
}
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