From: Aleksey Demakov <ademakov@gmail.com>
Date: Fri, 10 Nov 2006 21:03:09 +0000 (+0000)
Subject: add JIT_OP_IABS and JIT_OP_LABS rules
X-Git-Tag: before.move.to.git~180
X-Git-Url: https://git.unchartedbackwaters.co.uk/w/?a=commitdiff_plain;h=abd69d11d571568c503ad416a1551e3bbb6ed970;p=francis%2Flibjit.git

add JIT_OP_IABS and JIT_OP_LABS rules
---

diff --git a/ChangeLog b/ChangeLog
index 1dbf7bd..bb29b9e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2006-11-11  Aleksey Demakov  <ademakov@gmail.com>
+
+	* jit/jit-rules-x86.ins: add JIT_OP_IABS and JIT_OP_LABS rules.
+
 2006-11-04  Aleksey Demakov  <ademakov@gmail.com>
 
 	* jit/jit-rules-x86.ins: make comparison opcodes use three-address
diff --git a/jit/jit-rules-x86.ins b/jit/jit-rules-x86.ins
index 10db6d4..b4f5720 100644
--- a/jit/jit-rules-x86.ins
+++ b/jit/jit-rules-x86.ins
@@ -1248,6 +1248,27 @@ JIT_OP_FSQRT, JIT_OP_DSQRT, JIT_OP_NFSQRT: unary, stack
 		x86_fsqrt(inst);
 	}
 
+/*
+ * Absolute, minimum, maximum, and sign.
+ */
+
+JIT_OP_IABS:
+	[reg("eax"), scratch("edx")] -> {
+		x86_cdq(inst);
+		x86_alu_reg_reg(inst, X86_XOR, $1, $2);
+		x86_alu_reg_reg(inst, X86_SUB, $1, $2);
+	}
+
+JIT_OP_LABS:
+	[lreg, scratch("?")] -> {
+		x86_mov_reg_reg(inst, $2, %1, 4);
+		x86_shift_reg_imm(inst, X86_SAR, $2, 31);
+		x86_alu_reg_reg(inst, X86_XOR, $1, $2);
+		x86_alu_reg_reg(inst, X86_XOR, %1, $2);
+		x86_alu_reg_reg(inst, X86_SUB, $1, $2);
+		x86_alu_reg_reg(inst, X86_SBB, %1, $2);
+	}
+
 JIT_OP_FABS, JIT_OP_DABS, JIT_OP_NFABS: unary, stack
 	[freg] -> {
 		x86_fabs(inst);