6887cfb982
This allows interleaving facts and checks in a single block. In particular this enables using facts from assumes for conditions in the same block that come after the assume. This could be extended to only try to simplify checks at the point where a condition is used. Reviewed By: nikic Differential Revision: https://reviews.llvm.org/D138452
33 lines
840 B
LLVM
33 lines
840 B
LLVM
; RUN: opt -passes=constraint-elimination -S -debug %s 2>&1 | FileCheck %s
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; REQUIRES: asserts
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declare void @use(i1)
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define i1 @test_and_ule(i4 %x, i4 %y, i4 %z) {
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; CHECK: Processing fact to add to the system: %c.1 = icmp ule i4 %x, %y
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; CHECK-NEXT: Adding 'ule %x, %y'
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; CHECK-NEXT: constraint: %x + -1 * %y <= 0
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; CHECK: Processing fact to add to the system: %c.2 = icmp ule i4 %y, %z
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; CHECK-NEXT: Adding 'ule %y, %z'
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; CHECK-NEXT: constraint: %y + -1 * %z <= 0
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; CHECK: Checking %t.1 = icmp ule i4 %x, %z
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; CHECK: Condition %t.1 = icmp ule i4 %x, %z implied by dominating constraints
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entry:
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%c.1 = icmp ule i4 %x, %y
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%c.2 = icmp ule i4 %y, %z
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%and = and i1 %c.1, %c.2
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br i1 %and, label %bb1, label %exit
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bb1:
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%t.1 = icmp ule i4 %x, %z
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ret i1 %t.1
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exit:
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%c.3 = icmp ule i4 %x, %z
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ret i1 %c.3
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}
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