7d3924cee3
This patch adds the nuw (no unsigned wrap) and nsw (no signed wrap) poison-generating flags to the trunc instruction. Discourse thread: https://discourse.llvm.org/t/rfc-add-nowrap-flags-to-trunc/77453
54 lines
2.0 KiB
LLVM
54 lines
2.0 KiB
LLVM
; RUN: llvm-as < %s | llvm-dis > %t0
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; RUN: opt -S < %s > %t1
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; RUN: diff %t0 %t1
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; RUN: verify-uselistorder < %s
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; PR6140
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; Make sure the flags are serialized/deserialized properly for both
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; forward and backward references.
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define void @foo() nounwind {
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entry:
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br label %first
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second: ; preds = %first
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%u = add nuw i32 %a, 0 ; <i32> [#uses=0]
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%s = add nsw i32 %a, 0 ; <i32> [#uses=0]
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%us = add nuw nsw i32 %a, 0 ; <i32> [#uses=0]
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%z = add i32 %a, 0 ; <i32> [#uses=0]
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%hh = zext nneg i32 %a to i64
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%ll = zext i32 %s to i64
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%jj = or disjoint i32 %a, 0
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%oo = or i32 %a, 0
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%tu = trunc nuw i32 %a to i16
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%ts = trunc nsw i32 %a to i16
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%tus = trunc nuw nsw i32 %a to i16
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%t = trunc i32 %a to i16
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%tuv = trunc nuw <2 x i32> %aa to <2 x i16>
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%tsv = trunc nsw <2 x i32> %aa to <2 x i16>
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%tusv = trunc nuw nsw <2 x i32> %aa to <2 x i16>
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%tv = trunc <2 x i32> %aa to <2 x i16>
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unreachable
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first: ; preds = %entry
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%aa = bitcast <2 x i32> <i32 0, i32 0> to <2 x i32>
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%a = bitcast i32 0 to i32 ; <i32> [#uses=8]
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%uu = add nuw i32 %a, 0 ; <i32> [#uses=0]
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%ss = add nsw i32 %a, 0 ; <i32> [#uses=0]
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%uuss = add nuw nsw i32 %a, 0 ; <i32> [#uses=0]
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%zz = add i32 %a, 0 ; <i32> [#uses=0]
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%kk = zext nneg i32 %a to i64
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%rr = zext i32 %ss to i64
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%mm = or disjoint i32 %a, 0
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%nn = or i32 %a, 0
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%tuu = trunc nuw i32 %a to i16
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%tss = trunc nsw i32 %a to i16
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%tuss = trunc nuw nsw i32 %a to i16
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%tt = trunc i32 %a to i16
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%ttuv = trunc nuw <2 x i32> %aa to <2 x i16>
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%ttsv = trunc nsw <2 x i32> %aa to <2 x i16>
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%ttusv = trunc nuw nsw <2 x i32> %aa to <2 x i16>
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%ttv = trunc <2 x i32> %aa to <2 x i16>
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br label %second
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}
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