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llvm-mirror/test/Transforms/InstCombine/cast-mul-select.ll
Vedant Kumar d4dbce2555 [Local] Do not ignore zexts in salvageDebugInfo, PR45923 
Summary:
When salvaging a dead zext instruction, append a convert operation to
the DIExpressions of the debug uses of the instruction, to prevent the
salvaged value from being sign-extended.

I confirmed that lldb prints out the correct unsigned result for "f" in
the example from PR45923 with this changed applied.

rdar://63246143

Reviewers: aprantl, jmorse, chrisjackson, davide

Subscribers: hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D80034
2020-05-18 09:52:02 -07:00

184 lines
6.1 KiB
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; RUN: opt < %s -instcombine -S | FileCheck %s
; RUN: opt -debugify -instcombine -S < %s | FileCheck %s -check-prefix DBGINFO
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32"
define i32 @mul(i32 %x, i32 %y) {
; CHECK-LABEL: @mul(
; CHECK-NEXT: [[C:%.*]] = mul i32 [[X:%.*]], [[Y:%.*]]
; CHECK-NEXT: [[D:%.*]] = and i32 [[C]], 255
; CHECK-NEXT: ret i32 [[D]]
; Test that when zext is evaluated in different type
; we preserve the debug information in the resulting
; instruction.
; DBGINFO-LABEL: @mul(
; DBGINFO-NEXT: call void @llvm.dbg.value(metadata i32 %x, {{.*}} !DIExpression(DW_OP_LLVM_convert, 32, DW_ATE_unsigned, DW_OP_LLVM_convert, 8, DW_ATE_unsigned, DW_OP_stack_value))
; DBGINFO-NEXT: call void @llvm.dbg.value(metadata i32 %y, {{.*}} !DIExpression(DW_OP_LLVM_convert, 32, DW_ATE_unsigned, DW_OP_LLVM_convert, 8, DW_ATE_unsigned, DW_OP_stack_value))
; DBGINFO-NEXT: [[C:%.*]] = mul i32 {{.*}}
; DBGINFO-NEXT: [[D:%.*]] = and i32 {{.*}}
; DBGINFO-NEXT: call void @llvm.dbg.value(metadata i32 [[C]]
; DBGINFO-NEXT: call void @llvm.dbg.value(metadata i32 [[D]]
%A = trunc i32 %x to i8
%B = trunc i32 %y to i8
%C = mul i8 %A, %B
%D = zext i8 %C to i32
ret i32 %D
}
define i32 @select1(i1 %cond, i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @select1(
; CHECK-NEXT: [[D:%.*]] = add i32 [[X:%.*]], [[Y:%.*]]
; CHECK-NEXT: [[E:%.*]] = select i1 [[COND:%.*]], i32 [[Z:%.*]], i32 [[D]]
; CHECK-NEXT: [[F:%.*]] = and i32 [[E]], 255
; CHECK-NEXT: ret i32 [[F]]
;
%A = trunc i32 %x to i8
%B = trunc i32 %y to i8
%C = trunc i32 %z to i8
%D = add i8 %A, %B
%E = select i1 %cond, i8 %C, i8 %D
%F = zext i8 %E to i32
ret i32 %F
}
define i8 @select2(i1 %cond, i8 %x, i8 %y, i8 %z) {
; CHECK-LABEL: @select2(
; CHECK-NEXT: [[D:%.*]] = add i8 [[X:%.*]], [[Y:%.*]]
; CHECK-NEXT: [[E:%.*]] = select i1 [[COND:%.*]], i8 [[Z:%.*]], i8 [[D]]
; CHECK-NEXT: ret i8 [[E]]
;
%A = zext i8 %x to i32
%B = zext i8 %y to i32
%C = zext i8 %z to i32
%D = add i32 %A, %B
%E = select i1 %cond, i32 %C, i32 %D
%F = trunc i32 %E to i8
ret i8 %F
}
; The next 3 tests could be handled in instcombine, but evaluating values
; with multiple uses may be very slow. Let some other pass deal with it.
define i32 @eval_trunc_multi_use_in_one_inst(i32 %x) {
; CHECK-LABEL: @eval_trunc_multi_use_in_one_inst(
; CHECK-NEXT: [[Z:%.*]] = zext i32 [[X:%.*]] to i64
; CHECK-NEXT: [[A:%.*]] = add nuw nsw i64 [[Z]], 15
; CHECK-NEXT: [[M:%.*]] = mul i64 [[A]], [[A]]
; CHECK-NEXT: [[T:%.*]] = trunc i64 [[M]] to i32
; CHECK-NEXT: ret i32 [[T]]
;
%z = zext i32 %x to i64
%a = add nsw nuw i64 %z, 15
%m = mul i64 %a, %a
%t = trunc i64 %m to i32
ret i32 %t
}
define i32 @eval_zext_multi_use_in_one_inst(i32 %x) {
; CHECK-LABEL: @eval_zext_multi_use_in_one_inst(
; CHECK-NEXT: [[T:%.*]] = trunc i32 [[X:%.*]] to i16
; CHECK-NEXT: [[A:%.*]] = and i16 [[T]], 5
; CHECK-NEXT: [[M:%.*]] = mul nuw nsw i16 [[A]], [[A]]
; CHECK-NEXT: [[R:%.*]] = zext i16 [[M]] to i32
; CHECK-NEXT: ret i32 [[R]]
;
%t = trunc i32 %x to i16
%a = and i16 %t, 5
%m = mul nuw nsw i16 %a, %a
%r = zext i16 %m to i32
ret i32 %r
}
define i32 @eval_sext_multi_use_in_one_inst(i32 %x) {
; CHECK-LABEL: @eval_sext_multi_use_in_one_inst(
; CHECK-NEXT: [[T:%.*]] = trunc i32 [[X:%.*]] to i16
; CHECK-NEXT: [[A:%.*]] = and i16 [[T]], 14
; CHECK-NEXT: [[M:%.*]] = mul nuw nsw i16 [[A]], [[A]]
; CHECK-NEXT: [[O:%.*]] = or i16 [[M]], -32768
; CHECK-NEXT: [[R:%.*]] = sext i16 [[O]] to i32
; CHECK-NEXT: ret i32 [[R]]
;
%t = trunc i32 %x to i16
%a = and i16 %t, 14
%m = mul nuw nsw i16 %a, %a
%o = or i16 %m, 32768
%r = sext i16 %o to i32
ret i32 %r
}
; If we have a transform to shrink the above 3 cases, make sure it's not
; also trying to look through multiple uses in this test and crashing.
define void @PR36225(i32 %a, i32 %b) {
; CHECK-LABEL: @PR36225(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[WHILE_BODY:%.*]]
; CHECK: while.body:
; CHECK-NEXT: br i1 undef, label [[FOR_BODY3_US:%.*]], label [[FOR_BODY3:%.*]]
; CHECK: for.body3.us:
; CHECK-NEXT: [[TOBOOL:%.*]] = icmp eq i32 [[B:%.*]], 0
; CHECK-NEXT: [[SPEC_SELECT:%.*]] = select i1 [[TOBOOL]], i8 0, i8 4
; CHECK-NEXT: switch i3 undef, label [[EXIT:%.*]] [
; CHECK-NEXT: i3 0, label [[FOR_END:%.*]]
; CHECK-NEXT: i3 -1, label [[FOR_END]]
; CHECK-NEXT: ]
; CHECK: for.body3:
; CHECK-NEXT: switch i3 undef, label [[EXIT]] [
; CHECK-NEXT: i3 0, label [[FOR_END]]
; CHECK-NEXT: i3 -1, label [[FOR_END]]
; CHECK-NEXT: ]
; CHECK: for.end:
; CHECK-NEXT: [[H:%.*]] = phi i8 [ [[SPEC_SELECT]], [[FOR_BODY3_US]] ], [ [[SPEC_SELECT]], [[FOR_BODY3_US]] ], [ 0, [[FOR_BODY3]] ], [ 0, [[FOR_BODY3]] ]
; CHECK-NEXT: [[TMP0:%.*]] = zext i8 [[H]] to i32
; CHECK-NEXT: [[CMP:%.*]] = icmp slt i32 [[TMP0]], [[A:%.*]]
; CHECK-NEXT: br i1 [[CMP]], label [[EXIT]], label [[EXIT2:%.*]]
; CHECK: exit2:
; CHECK-NEXT: unreachable
; CHECK: exit:
; CHECK-NEXT: unreachable
;
entry:
br label %while.body
while.body:
%tobool = icmp eq i32 %b, 0
br i1 undef, label %for.body3.us, label %for.body3
for.body3.us:
%spec.select = select i1 %tobool, i8 0, i8 4
switch i3 undef, label %exit [
i3 0, label %for.end
i3 -1, label %for.end
]
for.body3:
switch i3 undef, label %exit [
i3 0, label %for.end
i3 -1, label %for.end
]
for.end:
%h = phi i8 [ %spec.select, %for.body3.us ], [ %spec.select, %for.body3.us ], [ 0, %for.body3 ], [ 0, %for.body3 ]
%conv = sext i8 %h to i32
%cmp = icmp sgt i32 %a, %conv
br i1 %cmp, label %exit, label %exit2
exit2:
unreachable
exit:
unreachable
}
; Check that we don't drop debug info when a zext is removed.
define i1 @foo(i1 zeroext %b) {
; DBGINFO-LABEL: @foo(
; DBGINFO-NEXT: call void @llvm.dbg.value(metadata i1 %b, {{.*}} !DIExpression(DW_OP_LLVM_convert, 1, DW_ATE_unsigned, DW_OP_LLVM_convert, 8, DW_ATE_unsigned, DW_OP_stack_value))
; DBGINFO-NEXT: ret i1 %b
%frombool = zext i1 %b to i8
ret i1 %b
}
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