[PATCH] D123174: [TypePromotion] Promote undef by converting to 0.
Craig Topper via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Thu May 12 09:10:19 PDT 2022
This revision was landed with ongoing or failed builds.
This revision was automatically updated to reflect the committed changes.
Closed by commit rGcec249c60dad: [TypePromotion] Promote undef by converting to 0. (authored by craig.topper).
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D123174/new/
https://reviews.llvm.org/D123174
Files:
llvm/lib/CodeGen/TypePromotion.cpp
llvm/test/CodeGen/AArch64/typepromotion-phisret.ll
llvm/test/Transforms/TypePromotion/AArch64/trunc-zext-chain.ll
llvm/test/Transforms/TypePromotion/ARM/phis-ret.ll
Index: llvm/test/Transforms/TypePromotion/ARM/phis-ret.ll
===================================================================
--- llvm/test/Transforms/TypePromotion/ARM/phis-ret.ll
+++ llvm/test/Transforms/TypePromotion/ARM/phis-ret.ll
@@ -227,7 +227,7 @@
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
-; CHECK-NEXT: [[VAL:%.*]] = phi i32 [ undef, [[ENTRY:%.*]] ], [ [[INC2:%.*]], [[IF_END:%.*]] ]
+; CHECK-NEXT: [[VAL:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[INC2:%.*]], [[IF_END:%.*]] ]
; CHECK-NEXT: [[CMP:%.*]] = icmp ult i32 [[VAL]], 128
; CHECK-NEXT: br i1 [[CMP]], label [[IF_THEN:%.*]], label [[IF_ELSE:%.*]]
; CHECK: if.then:
Index: llvm/test/Transforms/TypePromotion/AArch64/trunc-zext-chain.ll
===================================================================
--- llvm/test/Transforms/TypePromotion/AArch64/trunc-zext-chain.ll
+++ llvm/test/Transforms/TypePromotion/AArch64/trunc-zext-chain.ll
@@ -140,7 +140,7 @@
; CHECK: bb3:
; CHECK-NEXT: [[VAR4:%.*]] = phi i64 [ [[VAR33:%.*]], [[BB31:%.*]] ], [ undef, [[BB:%.*]] ]
; CHECK-NEXT: [[VAR5:%.*]] = phi %struct.wobble* [ [[VAR38:%.*]], [[BB31]] ], [ [[VAR]], [[BB]] ]
-; CHECK-NEXT: [[VAR6:%.*]] = phi i32 [ [[VAR32:%.*]], [[BB31]] ], [ undef, [[BB]] ]
+; CHECK-NEXT: [[VAR6:%.*]] = phi i32 [ [[VAR32:%.*]], [[BB31]] ], [ 0, [[BB]] ]
; CHECK-NEXT: [[VAR7:%.*]] = icmp eq %struct.wobble* [[VAR5]], null
; CHECK-NEXT: br i1 [[VAR7]], label [[BB8:%.*]], label [[BB9:%.*]]
; CHECK: bb8:
Index: llvm/test/CodeGen/AArch64/typepromotion-phisret.ll
===================================================================
--- llvm/test/CodeGen/AArch64/typepromotion-phisret.ll
+++ llvm/test/CodeGen/AArch64/typepromotion-phisret.ll
@@ -180,14 +180,14 @@
define i16 @phi_multiple_undefs(i16 zeroext %arg) {
; CHECK-LABEL: phi_multiple_undefs:
; CHECK: // %bb.0: // %entry
-; CHECK-NEXT: mov w8, #1
-; CHECK-NEXT: // implicit-def: $w9
+; CHECK-NEXT: mov w8, wzr
+; CHECK-NEXT: mov w9, #1
; CHECK-NEXT: .LBB4_1: // %loop
; CHECK-NEXT: // =>This Inner Loop Header: Depth=1
-; CHECK-NEXT: cmp w9, #128
-; CHECK-NEXT: cinc w10, w8, lo
-; CHECK-NEXT: add w9, w9, w10
-; CHECK-NEXT: cmp w9, #253
+; CHECK-NEXT: cmp w8, #128
+; CHECK-NEXT: cinc w10, w9, lo
+; CHECK-NEXT: add w8, w8, w10
+; CHECK-NEXT: cmp w8, #253
; CHECK-NEXT: b.lo .LBB4_1
; CHECK-NEXT: // %bb.2: // %exit
; CHECK-NEXT: ret
Index: llvm/lib/CodeGen/TypePromotion.cpp
===================================================================
--- llvm/lib/CodeGen/TypePromotion.cpp
+++ llvm/lib/CodeGen/TypePromotion.cpp
@@ -489,7 +489,7 @@
: ConstantExpr::getZExt(Const, ExtTy);
I->setOperand(i, NewConst);
} else if (isa<UndefValue>(Op))
- I->setOperand(i, UndefValue::get(ExtTy));
+ I->setOperand(i, ConstantInt::get(ExtTy, 0));
}
// Mutate the result type, unless this is an icmp or switch.
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