[llvm] [RISCV] Add short forward branch support for `lb`, `lbu`, `lh`, `lhu`, `lw`, `lwu` and `ld` (PR #170829)

[Craig Topper via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 6
+; RUN: llc < %s -verify-machineinstrs -mtriple=riscv32 -mattr=+a | FileCheck %s --check-prefixes=RV32I
+; RUN: llc < %s -verify-machineinstrs -mtriple=riscv64 -mattr=+a | FileCheck %s --check-prefixes=RV64I
+; RUN: llc < %s -verify-machineinstrs -mtriple=riscv32 -mattr=+a,+short-forward-branch-ialu | \
+; RUN:   FileCheck %s --check-prefixes=RV32I-SFB
+; RUN: llc < %s -verify-machineinstrs -mtriple=riscv64 -mattr=+a,+short-forward-branch-ialu | \
+; RUN:   FileCheck %s --check-prefixes=RV64I-SFB
+; RUN: llc < %s -verify-machineinstrs -mtriple=riscv32 -mattr=+a,+short-forward-branch-iload | \
+; RUN:   FileCheck %s --check-prefixes=RV32I-SFBILOAD
+; RUN: llc < %s -verify-machineinstrs -mtriple=riscv64 -mattr=+a,+short-forward-branch-iload | \
+; RUN:   FileCheck %s --check-prefixes=RV64I-SFBILOAD
+
+define i32 @test_i8_s_3(ptr %base, i1 %x, i32 %b) nounwind {
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topperc wrote:

Add `zeroext` attribute on `%x` to drop the uninteresting `andi` from the test output?

https://github.com/llvm/llvm-project/pull/170829