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55e622cae0
IndVarSimplify sometimes makes transforms basing on users that are trivially dead. In particular, if DCE wasn't run before it, there may be a dead `sext/zext` in loop that will trigger widening transforms, however it makes no sense to do it. This patch teaches IndVarsSimplify ignore the mist trivial cases of that. Differential Revision: https://reviews.llvm.org/D47974 Reviewed By: sanjoy llvm-svn: 334567
49 lines
1.0 KiB
LLVM
49 lines
1.0 KiB
LLVM
; RUN: opt < %s -indvars -S | FileCheck %s
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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declare void @use(i64 %x)
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; CHECK-LABEL: @foo
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define void @foo() {
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entry:
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br label %L1_header
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L1_header:
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br label %L2_header
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; CHECK: L2_header:
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; CHECK: %[[INDVAR:.*]] = phi i64
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; CHECK: %[[TRUNC:.*]] = trunc i64 %[[INDVAR]] to i32
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L2_header:
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%i = phi i32 [ 0, %L1_header ], [ %i_next, %L2_latch ]
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%i_prom = sext i32 %i to i64
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call void @use(i64 %i_prom)
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br label %L3_header
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L3_header:
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br i1 undef, label %L3_latch, label %L2_exiting_1
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L3_latch:
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br i1 undef, label %L3_header, label %L2_exiting_2
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L2_exiting_1:
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br i1 undef, label %L2_latch, label %L1_latch
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L2_exiting_2:
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br i1 undef, label %L2_latch, label %L1_latch
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L2_latch:
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%i_next = add nsw i32 %i, 1
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br label %L2_header
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L1_latch:
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; CHECK: L1_latch:
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; CHECK: %i_lcssa = phi i32 [ %[[TRUNC]], %L2_exiting_1 ], [ %[[TRUNC]], %L2_exiting_2 ]
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%i_lcssa = phi i32 [ %i, %L2_exiting_1 ], [ %i, %L2_exiting_2 ]
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br i1 undef, label %exit, label %L1_header
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exit:
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ret void
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}
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