[llvm] [GlobalISel] Use integer as the fallback type for getLLTForType. (PR #218148)

[David Green via llvm-commits]

https://github.com/davemgreen created https://github.com/llvm/llvm-project/pull/218148

In the test cases this comes up from struct types with a known size, from an invoke instruction. Using integer as the fallback type for it seems to work fine.

>From 1b7e8b71307461613f32f3b46f465448d86bf026 Mon Sep 17 00:00:00 2001
From: David Green <david.green at arm.com>
Date: Sat, 22 Aug 2026 16:38:26 +0100
Subject: [PATCH] [GlobalISel] Use integer as the fallback type for
 getLLTForType.

In the test cases this comes up from struct types with a known size, from an
invoke instruction. Using integer as the fallback type for it seems to work
fine.
---
 llvm/lib/CodeGen/LowLevelTypeUtils.cpp                    | 3 ++-
 .../CodeGen/AArch64/GlobalISel/irtranslator-exceptions.ll | 8 ++++----
 .../AArch64/GlobalISel/irtranslator-unwind-inline-asm.ll  | 4 ++--
 3 files changed, 8 insertions(+), 7 deletions(-)

diff --git a/llvm/lib/CodeGen/LowLevelTypeUtils.cpp b/llvm/lib/CodeGen/LowLevelTypeUtils.cpp
index 95bd06c2f9bc9..6ef6f641add8a 100644
--- a/llvm/lib/CodeGen/LowLevelTypeUtils.cpp
+++ b/llvm/lib/CodeGen/LowLevelTypeUtils.cpp
@@ -72,7 +72,8 @@ LLT llvm::getLLTForType(Type &Ty, const DataLayout &DL) {
     if (Ty.isByteTy())
       return LLT::integer(SizeInBits);
 
-    return LLT::scalar(SizeInBits);
+    // Fall back to integer types for anything else.
+    return LLT::integer(SizeInBits);
   }
 
   if (Ty.isTokenTy())
diff --git a/llvm/test/CodeGen/AArch64/GlobalISel/irtranslator-exceptions.ll b/llvm/test/CodeGen/AArch64/GlobalISel/irtranslator-exceptions.ll
index 9235371a500bd..12b320f2b95b9 100644
--- a/llvm/test/CodeGen/AArch64/GlobalISel/irtranslator-exceptions.ll
+++ b/llvm/test/CodeGen/AArch64/GlobalISel/irtranslator-exceptions.ll
@@ -29,7 +29,7 @@ define { ptr, i32 } @bar() personality ptr @__gxx_personality_v0 {
   ; CHECK-NEXT:   liveins: $x0, $x1
   ; CHECK-NEXT: {{  $}}
   ; CHECK-NEXT:   EH_LABEL <mcsymbol >
-  ; CHECK-NEXT:   [[DEF2:%[0-9]+]]:_(s128) = G_IMPLICIT_DEF
+  ; CHECK-NEXT:   [[DEF2:%[0-9]+]]:_(i128) = G_IMPLICIT_DEF
   ; CHECK-NEXT:   [[COPY1:%[0-9]+]]:_(p0) = COPY $x0
   ; CHECK-NEXT:   [[COPY2:%[0-9]+]]:_(p0) = COPY $x1
   ; CHECK-NEXT:   [[PTRTOINT:%[0-9]+]]:_(i32) = G_PTRTOINT [[COPY2]](p0)
@@ -74,7 +74,7 @@ define void @test_invoke_indirect(ptr %callee) personality ptr @__gxx_personalit
   ; CHECK-NEXT:   liveins: $x0, $x1
   ; CHECK-NEXT: {{  $}}
   ; CHECK-NEXT:   EH_LABEL <mcsymbol >
-  ; CHECK-NEXT:   [[DEF:%[0-9]+]]:_(s128) = G_IMPLICIT_DEF
+  ; CHECK-NEXT:   [[DEF:%[0-9]+]]:_(i128) = G_IMPLICIT_DEF
   ; CHECK-NEXT:   [[COPY1:%[0-9]+]]:_(p0) = COPY $x0
   ; CHECK-NEXT:   [[COPY2:%[0-9]+]]:_(p0) = COPY $x1
   ; CHECK-NEXT:   [[PTRTOINT:%[0-9]+]]:_(i32) = G_PTRTOINT [[COPY2]](p0)
@@ -122,7 +122,7 @@ define void @test_invoke_varargs() personality ptr @__gxx_personality_v0 {
   ; CHECK-NEXT:   liveins: $x0, $x1
   ; CHECK-NEXT: {{  $}}
   ; CHECK-NEXT:   EH_LABEL <mcsymbol >
-  ; CHECK-NEXT:   [[DEF:%[0-9]+]]:_(s128) = G_IMPLICIT_DEF
+  ; CHECK-NEXT:   [[DEF:%[0-9]+]]:_(i128) = G_IMPLICIT_DEF
   ; CHECK-NEXT:   [[COPY1:%[0-9]+]]:_(p0) = COPY $x0
   ; CHECK-NEXT:   [[COPY2:%[0-9]+]]:_(p0) = COPY $x1
   ; CHECK-NEXT:   [[PTRTOINT:%[0-9]+]]:_(i32) = G_PTRTOINT [[COPY2]](p0)
@@ -168,7 +168,7 @@ define i32 @test_lpad_phi() personality ptr @__gxx_personality_v0 {
   ; CHECK-NEXT: {{  $}}
   ; CHECK-NEXT:   [[PHI:%[0-9]+]]:_(i32) = G_PHI [[C1]](i32), %bb.1
   ; CHECK-NEXT:   EH_LABEL <mcsymbol >
-  ; CHECK-NEXT:   [[DEF:%[0-9]+]]:_(s128) = G_IMPLICIT_DEF
+  ; CHECK-NEXT:   [[DEF:%[0-9]+]]:_(i128) = G_IMPLICIT_DEF
   ; CHECK-NEXT:   [[COPY:%[0-9]+]]:_(p0) = COPY $x0
   ; CHECK-NEXT:   [[COPY1:%[0-9]+]]:_(p0) = COPY $x1
   ; CHECK-NEXT:   [[PTRTOINT:%[0-9]+]]:_(i32) = G_PTRTOINT [[COPY1]](p0)
diff --git a/llvm/test/CodeGen/AArch64/GlobalISel/irtranslator-unwind-inline-asm.ll b/llvm/test/CodeGen/AArch64/GlobalISel/irtranslator-unwind-inline-asm.ll
index 653ee4f450936..70f5a21739996 100644
--- a/llvm/test/CodeGen/AArch64/GlobalISel/irtranslator-unwind-inline-asm.ll
+++ b/llvm/test/CodeGen/AArch64/GlobalISel/irtranslator-unwind-inline-asm.ll
@@ -32,7 +32,7 @@ define dso_local void @test() personality ptr @__gxx_personality_v0 {
   ; CHECK-NEXT:   liveins: $x0, $x1
   ; CHECK-NEXT: {{  $}}
   ; CHECK-NEXT:   EH_LABEL <mcsymbol >
-  ; CHECK-NEXT:   [[DEF:%[0-9]+]]:_(s128) = G_IMPLICIT_DEF
+  ; CHECK-NEXT:   [[DEF:%[0-9]+]]:_(i128) = G_IMPLICIT_DEF
   ; CHECK-NEXT:   [[COPY:%[0-9]+]]:_(p0) = COPY $x0
   ; CHECK-NEXT:   [[COPY1:%[0-9]+]]:_(p0) = COPY $x1
   ; CHECK-NEXT:   [[PTRTOINT:%[0-9]+]]:_(i32) = G_PTRTOINT [[COPY1]](p0)
@@ -82,7 +82,7 @@ define void @test2() #0 personality ptr @__gcc_personality_v0 {
   ; CHECK-NEXT:   liveins: $x0, $x1
   ; CHECK-NEXT: {{  $}}
   ; CHECK-NEXT:   EH_LABEL <mcsymbol >
-  ; CHECK-NEXT:   [[DEF1:%[0-9]+]]:_(s128) = G_IMPLICIT_DEF
+  ; CHECK-NEXT:   [[DEF1:%[0-9]+]]:_(i128) = G_IMPLICIT_DEF
   ; CHECK-NEXT:   [[COPY1:%[0-9]+]]:_(p0) = COPY $x0
   ; CHECK-NEXT:   [[COPY2:%[0-9]+]]:_(p0) = COPY $x1
   ; CHECK-NEXT:   [[PTRTOINT:%[0-9]+]]:_(i32) = G_PTRTOINT [[COPY2]](p0)