Subzero: Make -reg-use and -reg-exclude specific to register class.
The main feature here is that when listing a register via the -reg-use or -reg-exclude option, we can limit the effect to a single register class, instead of applying it across all register classes. Example:
pnacl-sz -reg-use i32:eax,i32:ecx,i32:edx -reg-exclude f32:xmm0
Note that without the register class prefix, behavior is the same as before, specifically that the restriction applies to all register classes.
This requires a few high-level changes:
1. We need a mechanism to name *all* register classes, not just the standard ones that map to IceType values.
2. While we're at it, give standard types a more usable name, e.g. "v4i32" instead of "<4 x i32>".
3. Since we've commandeered ":" as the class/register token separator, we change ARM i64 register pair names from e.g. "r0:r1" to "r0r1".
The motivation is that for register allocator torture testing, we'd like to drastically restrict the registers available to e.g. the extensively-used i32 register class, while not overly restricting the seldom-used i32to8 register class (which reflects the set of i32 registers that may trivially truncate to i8).
BUG= none
R=kschimpf@google.com
Review URL: https://codereview.chromium.org/1614273002 .
diff --git a/src/IceTargetLowering.h b/src/IceTargetLowering.h
index 202b85a..f8355b9 100644
--- a/src/IceTargetLowering.h
+++ b/src/IceTargetLowering.h
@@ -355,7 +355,8 @@
filterTypeToRegisterSet(GlobalContext *Ctx, int32_t NumRegs,
llvm::SmallBitVector TypeToRegisterSet[],
size_t TypeToRegisterSetSize,
- std::function<IceString(int32_t)> getRegName);
+ std::function<IceString(int32_t)> getRegName,
+ std::function<IceString(RegClass)> getRegClassName);
virtual void lowerAlloca(const InstAlloca *Inst) = 0;
virtual void lowerArithmetic(const InstArithmetic *Inst) = 0;
virtual void lowerAssign(const InstAssign *Inst) = 0;