119 lines
2.9 KiB
LLVM
119 lines
2.9 KiB
LLVM
; RUN: opt < %s -instcombine -S | FileCheck %s
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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; CHECK-LABEL: @oppositesign
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; CHECK: add nsw i16 %a, %b
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define i16 @oppositesign(i16 %x, i16 %y) {
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; %a is negative, %b is positive
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%a = or i16 %x, 32768
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%b = and i16 %y, 32767
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%c = add i16 %a, %b
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ret i16 %c
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}
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define i16 @zero_sign_bit(i16 %a) {
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; CHECK-LABEL: @zero_sign_bit(
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; CHECK-NEXT: and
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; CHECK-NEXT: add nuw
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; CHECK-NEXT: ret
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%1 = and i16 %a, 32767
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%2 = add i16 %1, 512
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ret i16 %2
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}
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define i16 @zero_sign_bit2(i16 %a, i16 %b) {
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; CHECK-LABEL: @zero_sign_bit2(
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; CHECK-NEXT: and
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; CHECK-NEXT: and
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; CHECK-NEXT: add nuw
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; CHECK-NEXT: ret
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%1 = and i16 %a, 32767
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%2 = and i16 %b, 32767
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%3 = add i16 %1, %2
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ret i16 %3
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}
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declare i16 @bounded(i16 %input);
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declare i32 @__gxx_personality_v0(...);
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!0 = !{i16 0, i16 32768} ; [0, 32767]
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!1 = !{i16 0, i16 32769} ; [0, 32768]
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define i16 @add_bounded_values(i16 %a, i16 %b) personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
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; CHECK-LABEL: @add_bounded_values(
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entry:
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%c = call i16 @bounded(i16 %a), !range !0
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%d = invoke i16 @bounded(i16 %b) to label %cont unwind label %lpad, !range !0
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cont:
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; %c and %d are in [0, 32767]. Therefore, %c + %d doesn't unsigned overflow.
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%e = add i16 %c, %d
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; CHECK: add nuw i16 %c, %d
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ret i16 %e
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lpad:
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%0 = landingpad { i8*, i32 }
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filter [0 x i8*] zeroinitializer
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ret i16 42
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}
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define i16 @add_bounded_values_2(i16 %a, i16 %b) personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
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; CHECK-LABEL: @add_bounded_values_2(
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entry:
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%c = call i16 @bounded(i16 %a), !range !1
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%d = invoke i16 @bounded(i16 %b) to label %cont unwind label %lpad, !range !1
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cont:
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; Similar to add_bounded_values, but %c and %d are in [0, 32768]. Therefore,
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; %c + %d may unsigned overflow and we cannot add NUW.
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%e = add i16 %c, %d
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; CHECK: add i16 %c, %d
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ret i16 %e
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lpad:
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%0 = landingpad { i8*, i32 }
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filter [0 x i8*] zeroinitializer
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ret i16 42
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}
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; CHECK-LABEL: @ripple_nsw1
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; CHECK: add nsw i16 %a, %b
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define i16 @ripple_nsw1(i16 %x, i16 %y) {
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; %a has at most one bit set
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%a = and i16 %y, 1
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; %b has a 0 bit other than the sign bit
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%b = and i16 %x, 49151
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%c = add i16 %a, %b
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ret i16 %c
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}
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; Like the previous test, but flip %a and %b
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; CHECK-LABEL: @ripple_nsw2
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; CHECK: add nsw i16 %b, %a
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define i16 @ripple_nsw2(i16 %x, i16 %y) {
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%a = and i16 %y, 1
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%b = and i16 %x, 49151
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%c = add i16 %b, %a
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ret i16 %c
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}
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; CHECK-LABEL: @ripple_no_nsw1
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; CHECK: add i32 %a, %x
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define i32 @ripple_no_nsw1(i32 %x, i32 %y) {
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; We know nothing about %x
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%a = and i32 %y, 1
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%b = add i32 %a, %x
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ret i32 %b
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}
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; CHECK-LABEL: @ripple_no_nsw2
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; CHECK: add nuw i16 %a, %b
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define i16 @ripple_no_nsw2(i16 %x, i16 %y) {
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; %a has at most one bit set
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%a = and i16 %y, 1
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; %b has a 0 bit, but it is the sign bit
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%b = and i16 %x, 32767
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%c = add i16 %a, %b
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ret i16 %c
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}
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